CBSE > Class 10 > Science | CBSE Board | Homework Help

Because mendeeleev arrange the elements according to increase atomic masses that's why a correct position of hydrogen did not explain in mendeeleev periodic table

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“Society blames the mother for the *** of the baby” . But who is responsible for this determination of *** in the baby. Explain with flowchart.

Posted by Nithyashree Suresh Babu 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Ritika Talwar 4 years, 8 months ago

Father is responsible

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Vaishali 10 4 years, 8 months ago

Husband is responsibile for these

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Fiza Noriya 4 years, 8 months ago

A child inherits X chromosome from his/her mother and the one who inherits X chromosome from her father will be a girl and the one who inherits Y chromosome from his father will be a boy... Male. Female XY. XX XX. XY Girl. Boy

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Himanshu Panwar 4 years, 8 months ago

The sperm of male is determined the s.ê.x of baby

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Saif Raza 4 years, 8 months ago

Cbsce syllabus

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State the properties of Eka-aluminium and gallium

Posted by Oav Papadahandi 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Khushi 4 years, 8 months ago

Eka-aluminium and gallium are the two names of the same element as Eka -Aluminum has almost exactly the same properties as the actual properties of the gallium element. The properties: atomic mass, density, melting point, formula of chloride and formula of oxide are almost the same.

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List the physical properties of acids

Posted by Alankrit Bharti Verma 4 years, 8 months ago

CBSE > Class 10 > Science

3 answers

Vaishali 10 4 years, 8 months ago

They realise H+ ions in aqueous solution

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Nithyashree Suresh Babu 4 years, 8 months ago

1.Acids have a SOUR taste. 2.All acids are SOLUBLE in water. 3.Acids solutions turn BLUE litmus paper RED. 4.Acid solutions have a pH values < 7. 5.Most acid solutions are CORROSIVE. 6.All dilute acids CONDUCT ELECTRICITY due to the presence MOBILE IONS in solution.

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Oav Papadahandi 4 years, 8 months ago

PHYSICAL PROPERTIES OF ACIDS: Acids have a SOUR taste.All acids are SOLUBLE in water.Acids solutions turn BLUE litmus paper RED.Acid solutions have a pH values < 7.Most acid solutions are CORROSIVE.All dilute acids CONDUCT ELECTRICITY due to the presence MOBILE IONS in solution. ??

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What are the limitations of mendeleeve's periodic table?

Posted by Oav Papadahandi 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Nithyashree Suresh Babu 4 years, 8 months ago

According to NCERT Book... 1. No fixed position can be given to hydrogen in the periodic table. 2. The atomic masses don't increase in a regular manner in going from one element to the next. 3. It was not possible to predict how many elements could be discovered between two elements-especially when we take heavier elements.

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Oav Papadahandi 4 years, 8 months ago

Send the answer of 2nd question

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Oav Papadahandi 4 years, 8 months ago

Thanks khusi?

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Khushi 4 years, 8 months ago

Limitations of Mendeleev’s periodic table: ✿Elements with large difference in properties were included in the same group. Eg: Hard metals like copper (Cu) and silver (Ag) were included along with soft metals like sodium (Na) and potassium (K). ✿No proper position could be given to the element hydrogen. Non-metallic hydrogen was placed along with metals like lithium (Li), sodium (Na) and potassium (K). ✿The increasing order of atomic mass was not strictly followed throughout. Eg. Co & Ni, Te &I. ✿No place for isotopes in the periodic table.

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Account Deleted 4 years, 8 months ago

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State the features of mendeleeve's periodic table.?

Posted by Oav Papadahandi 4 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Khushi 4 years, 8 months ago

1. In Mendeleev’s periodic table, the horizontal rows are called periods. There are seven periods and they are numbered from 1 to 7. 2. As one moves from left to right in a period, there is a gradual change from metallic to non-metallic properties. 3. There are eight vertical columns called groups. They are numbered from I to VIII. Groups I to VII are further divided into two subgroups A and B.

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Nithyashree Suresh Babu 4 years, 8 months ago

Main features of Mendeleev's Periodic Table: (a) There are seven horizontal rows in the periodic table. They are called periods and are numbered from 1 to 7. (b) In a given period, there is a regular gradation in the properties of elements from left to right. (c) There are eight vertical columns in the periodic table. These are named as groups. They are numbered from I to VIII. Groups I to VII are subdivided into subgroups A and B.

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What is SI unit of pressure

Posted by Ujjwal Jaiswal 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Khushi 4 years, 8 months ago

The SI unit of pressure is Pascal (represented as Pa) which is equal to one newton per square metre.

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Yashika B. 4 years, 8 months ago

Pascal

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Pankaj Chandravanshl 4 years, 8 months ago

Pascal

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Naina Gupta 4 years, 8 months ago

Pascal

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Khushi Kaur 4 years, 8 months ago

pascal

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Why graphite conduct electricity?

Posted by Mahak Sadhya 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Aparna Thakur 4 years, 8 months ago

Because one carbon compound is free State in graphite therefore graphite conducts electricity

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Yash Verma 4 years, 8 months ago

Because one corbon compund is free state in graphiete therefore Graphite conduct electricity

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Dr. Asha Kumari 👩‍⚕️I.A.S Officer😊❣️💖 4 years, 8 months ago

Show the refractive index of water with respect to air 4/3. What is the refractive index.with respect to water

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Ujjwal Jaiswal 4 years, 8 months ago

Ok wait

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Ujjwal Jaiswal 4 years, 8 months ago

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Are refractive indices of water and glass are 4/3 and 3/2 respectively find speed of light in each

Posted by Gursharn Sandhu 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Ramanji Chintha 4 years, 8 months ago

Refractive index of water =4/3

Then n= c/v

C =3×10⁸ m/s

V=3×10⁸ × 3 /4

V= 2.5 ×10⁸ m/s

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Hey guys ? u know my pre board exam of science is come from arihant sample paper as well as set no.11 is my preboard exam paper .and also in maths my exam paper is come from arihant sample papers.. as well as set no. 6 Is .my maths exam paper........ I advise u to make arihant sample papers perfect to getting highest marks in science and maths ....just i prefer u .........but this is not important ...may be ur paper will come from any other type of books or only from NCERT..... ...

Posted by Itachi Uchiha ? 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Vishal Tilokani 4 years, 8 months ago

Thanks for letting us know ! Depends from school to school. But, our papers will be from CBSE. So, it's not necessary to make judgement ; either Oswaal can get you good marks.

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Why is the amount of gas collected in one of the test tubes in activity 1.7 double of the amount collected in the other ? Name this gas

Posted by Chandrakala Patail 4 years, 8 months ago

CBSE > Class 10 > Science

3 answers

Astrid Babe 4 years, 8 months ago

Hydrogen because ratio of water is 2:1 hydrogen has twice than oxygen Hope it helpful for you

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Adithya Dev A 4 years, 8 months ago

Hydrogen. 2H2 + O2 ----> 2H2O.

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Sunny Kashyap 4 years, 8 months ago

Gas

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What is balance chemical equation?

Posted by Susma Chatterjee 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Sujith Sali 4 years, 8 months ago

Equal number of atom in reactants and products. For balanced chemical equation it should be balanced in reactants And products. It can be done by trial method .

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Khushi 4 years, 8 months ago

The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.

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Kiran Kumari 4 years, 8 months ago

The equation in which no. Of atom of each element are equal on both side is called balanced chemical equation

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Chandrakala Patail 4 years, 8 months ago

It has equal number of atoms of different elements in reactants and product

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Adithya Dev A 4 years, 8 months ago

When the no. of atoms of same type in both LHS and RHS in a chemical equation at a specific temperature and pressure is equal, then the equation is said to be balanced. Eg :- 2H2 + O2 ----> 2H2O.

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Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K

Posted by Priya Tomar 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Susma Chatterjee 4 years, 8 months ago

Newland’s law of octaves.

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Verstile nature of carbon

Posted by Anandi Sigar 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Priya Tomar 4 years, 8 months ago

Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds.

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Name the lens which always forms a neutral image of an object?

Posted by Zahidur Hussain 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Aparna Thakur 4 years, 8 months ago

Plane mirror

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Khushi 4 years, 8 months ago

Plane mirror

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Priya Tomar 4 years, 8 months ago

Plane mirror

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Sunny Singh Rajpoot 4 years, 8 months ago

Concave lens

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Adithya Dev A 4 years, 8 months ago

Plane mirror.

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Difine the unit of potential deference

Posted by Oav Papadahandi 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Khushi 4 years, 8 months ago

The S.I Unit of potential difference is volt (V). 1 volt =One volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other.

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Pawan Kumari 4 years, 8 months ago

Volt

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Rohit Saini 4 years, 8 months ago

The SI unit of electric potential difference is volt (named after Italian scientist Alessandro Volta). The electric potential difference across two points is said to be 1V if 1J of work is done in moving 1C of charge from one point to another. 1V = 1J/1C. .

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Adithya Dev A 4 years, 8 months ago

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Gagan Bansal 4 years, 8 months ago

Unit of potential difference is volt

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Is cbse golden guide 2019-2020 edition only available or 2020-21 is also available (tell in detail) ? please

Posted by Dewang Doye 4 years, 8 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

SI unit of potential difference?

Posted by Khüšhi ☺ 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Adithya Dev A 4 years, 8 months ago

Volt (named after Italian scientist Alessandro Volta).

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Rohit Saini 4 years, 8 months ago

Volt

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Zahidur Hussain 4 years, 8 months ago

Volt

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Oav Papadahandi 4 years, 8 months ago

Volt (v)

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Shivam Shah 4 years, 8 months ago

Volte

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why is the amount of hydrogen double that of oxygen or what is the ratio between hydrogen and oxygen during electrolysis of water ?

Posted by Vinay Kumar 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Gagan Bansal 4 years, 8 months ago

Volt

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✔❣Guys to study Science and Math ❣? ✔❣which YouTube channels u prefer or suggest me?? ❣?

Posted by Shruti Kushwaha 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Aakriti Rawat 4 years, 8 months ago

For science edumantra and for maths green board

1Thank You

Teesha Bhansali 4 years, 8 months ago

Vedantu's umang series/Magnet brains

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Khüšhi ☺ 4 years, 8 months ago

Bkp for science and maths teacher for maths I have completed my syllabus with their help ☺

3Thank You

Mohit Bhandari 4 years, 8 months ago

Vedantu as well as edumamtra

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Ayush Joshi 4 years, 8 months ago

Vedantu

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Name array of light which passes through the centre of lens without any deviation

Posted by Priyanshi Yadav 4 years, 8 months ago

CBSE > Class 10 > Science

3 answers

Pragya Bhadana 4 years, 8 months ago

A ray from opticle center

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Snailvi Tiwari 4 years, 8 months ago

Optical Centre

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Adithya Dev A 4 years, 8 months ago

Principal axis.

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Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire. Why?

Posted by All In One 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Adithya Dev A 4 years, 8 months ago

The properties of a compound is generally, different from the properties of its constituent elements.

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ANSWER

Explain how amniotic fluid is not so good for society?

Posted by Faiza Irshad 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Huzaifa Fareed 4 years, 8 months ago

Amniotic fluid embolism can cause serious complications for you and others, including: Brain injury. Low blood oxygen can cause permanent, severe neurological damage or brain death.

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Differentiate between monohybrid cross and dihybrid cross

Posted by Chandani Maurya 4 years, 8 months ago

CBSE > Class 10 > Science

3 answers

Adithya Dev A 4 years, 8 months ago

Sorry, dihybrid is two pairs.

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Adithya Dev A 4 years, 8 months ago

In monohybrid crosses, any one pair of contrasting traits is considered. Eg :- Tall pea plants (TT) and short pea plants (tt). In pea plants, the phenotypic ratio of F2 progeny in monohybrid crosses is always roughly 3:1. But, in dihybrid crosses, more than one pairs of contrasting traits may be considered. Eg :- Pea plants bearing round and green seeds (RRyy) and wrinkled and yellow seeds (rrYY). In pea plants, the phenotypic ratio of F2 progeny is 9:3:3:1.

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Dhruv Dhruv 4 years, 8 months ago

Hlo

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Keeping food in air tight containers helps to slow down the oxidation. Justify the statement.- 3 Marks

Posted by Sumit Kumar 4 years, 8 months ago

CBSE > Class 10 > Science

2 answers

All In One 4 years, 8 months ago

When we keep food in air tight container it reduce the chance of oxidation of fat and oil containing food items, or slow down the oxidation .

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Adithya Dev A 4 years, 8 months ago

The food we eat may contain fats and oils which when kept in contact with air for a long time, gets oxidised in presence of oxygen to become rancid. This would result in foul smell and bad taste. But, if kept in air tight containers, the chance of coming in contact with oxygen containing air would be reduced. This would thus, help slow down the process of oxidation.

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An aqueous solution of metal nitrate P reacts with sodium bromide solution to form yellow ppt of compound Q which is used in photography. Q on exposure to sunlight undergoes decomposition reaction to form metal present in P along with reddish brown gas. Identify P &Q. Write the chemical reaction & type of chemical reaction

Posted by Priya Tomar 4 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Adithya Dev A 4 years, 8 months ago

Fist reaction is double displacement and second reaction is thermal decomposition.

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Adithya Dev A 4 years, 8 months ago

P = Silver (Ag). Q = Silver Bromide (AgBr)..... AgNO3 + NaBr ----> AgBr + NaNO3..... For black and white photography ===> 2AgBr --Δ--> 2Ag + Br2.

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ANSWER

How does the embryo get nourishment inside the mother body?

Posted by Megha Thakur 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Chanchal Sharma 4 years, 8 months ago

Through placenta embryo get nourished ,due to implantantaion of fertilized egg in uterus it create a tube called placenta for nourishment of embryo

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Shivam Kumar 4 years, 8 months ago

When the embryo get implanted the placenta is connected to a cord known as amblical cord through which embryo get nourished

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Vetrivel S 10 A4 4 years, 8 months ago

Placenta is a tissue with attaches with embryo and helps in nourishment

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Akshita Gupta 4 years, 8 months ago

Through placenta

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Himanshu Verma 4 years, 8 months ago

Through placenta

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Delate syllabus accedamic unit

Posted by Laxmi Sharma 4 years, 8 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

How are fats digest in our bodies?where does the process take place?

Posted by Tshering Dolkar Bhutia 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Manish Garg 4 years, 8 months ago

Fat is digested in small intestine by enzyme lipase.

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ANSWER

What is the difference between Binary fission and multiple fission

Posted by Satyam Gupta 4 years, 8 months ago

CBSE > Class 10 > Science

5 answers

Bhoomika Maheshwari 4 years, 8 months ago

In binary fission parent cell divides into two daughter cells -example Amoeba ,leishmania

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Navjot Kaur 4 years, 8 months ago

In binary fission, the parent cell divides itself into two equal and identical daughter cells. It is the most common form of reproduction in prokaryotes such as bacteria. In multiple fission, a single parent cell is divided into many daughter cells.

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Adithya Dev A 4 years, 8 months ago

BINARY FISSION = parent body divides into two daughter cells. Karyokinesis occurs only once. Eg :- Amoeba, leishmania, etc. MULTIPLE FISSION = parent body divides into multiple daughter cells. Karyokinesis occurs multiple times. Eg :- Plasmodium.

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Heena Choudhary 4 years, 8 months ago

In binary fission, there is only one parent organism. Eg. Amoeba In multiple fission, there are more than one parent organism.. Eg. Plasmodium

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Heena Choudhary 4 years, 8 months ago

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