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Write possible isomers of compound with molecular formula C3H6O.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

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Identify the parent acid and base of the salt ammonium chloride. what will be the nature of salt?

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Ammonium chloride - NH₄Cl; It is obtained from ammonia and hydrochloric acid. The aqueous solution of ammonium chloride salt turns blue litmus red. Hence, it is acidic in nature.

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How is Sodium Hydroxide obtained from common salt? name various products and by products obtained in this process.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Sodium hydroxide is produced by the electrolysis of an aqueous solution of sodium chloride (called brine).

The process is called the chlor-alkali process because of the products formed, i.e. ‘chlor’ for chlorine and ‘alkali’ for sodium hydroxide.

2NaCl_(aq) + 2H₂O_(aq) → 2NaOH_(aq) + H_2(g) + Cl_2(g)

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Give reasons for the following:(a) tungsten metal is selected for making filaments of incandescent lamps/ bulbs(b) copper is used to make hot water tanks and not Steel.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Sahil Sorkhi 6 years ago

a) because tungsten has very high melting point.?? b) because copper is a good conductor of electricity. ??

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Describe STDs and explain the ways to prevent them.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Rajveer Singh 6 years ago

These are the sexually transmitted disease These can be prevented only By barrier method

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(a)Name the cell where DNA is located.(b) explain DNA role in the process of reproduction.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

(a) DNA is located in chromosomes in the form of genes in the cell.

(b) When the DNA already present in the nucleus of a parent cell is copied by making more of DNA by certain biochemical reactions, then slight variations come in the two copies formed. Thus, variations are produced in the offspring's during reproduction which form the basis of evolution.
Example: Offspring's produced by asexual reproduction have slight variations from their parents.

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(a)What is a gene?(b) Where are genes located? (c)what is the nature of gene?

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

(a) Genes are the functional units of chromosomes.

(b) Genes are located on chromosomes.

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How much most most questions. probablity

Posted by Gulshan Kumar 6 years ago

CBSE > Class 10 > Science

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Chapter 3

Posted by Sanjay Kumar 6 years ago

CBSE > Class 10 > Science

0 answers

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Criteria to pass in IT?

Posted by Vidya Verma 6 years ago

CBSE > Class 10 > Science

3 answers

Aman Saxena 6 years ago

By study

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Aadya Singh 6 years ago

30 marks theory + 70 marks practical ?

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Broken Soul 6 years ago

40 marks theory + 60 marks practical , score 33%

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What is the another name of unbalanced equations

Posted by Parav Singh 6 years ago

CBSE > Class 10 > Science

3 answers

Rahul Suresh 6 years ago

Skeletal equation

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Broken Soul 6 years ago

Skeletal chemical equations

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Prabal Das 6 years ago

Skeletal chemical equation

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Difference between ammeter and galvanometer

Posted by Varun Gupta 6 years ago

CBSE > Class 10 > Science

1 answers

Broken Soul 6 years ago

Galvanometer just check if there is current , ammeter measures amount of current in amperes

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The focal length of the eye lens increases when ciliary muscles are most relaxed. (give reason of this question)

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Broken Soul 6 years ago

When they are relaxed, the thickness of the lens decreases as the aperture increases. As thickness decreases, the power of the lens decreases qnd focal length increases.

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Lights of red colour are used for danger signals .(give reason of this question)

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

3 answers

Priya Rajoriya Rajoriya 6 years ago

Because red colour is least scattered colored and it has larger wavelength. It travel larger distance that's why red color is used in traffic signal

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Sahil Sorkhi 6 years ago

It has shortest wavelength and highest speed. (in short speed is directly proportional to wavelength) ??

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Broken Soul 6 years ago

It has longest wavelength and thus it scatters the least and can be seen in difficult situations like fog, etc

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what is the meaning of precipitate

Posted by Deepa Sasi 6 years ago

CBSE > Class 10 > Science

3 answers

Parul Saini 6 years ago

A white insoluble substance formed mostly after double displacement rxn.

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Broken Soul 6 years ago

Hi diku

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Ruby Sanger 6 years ago

Search on google?

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Explain a) How urine is produced in human body? b) What are the excretory wastes in plants?

Posted by Dhruvil Bharucha 6 years ago

CBSE > Class 10 > Science

1 answers

Punam Singh 6 years ago

B)excreatory wastes in body include resin,gum,leaves and fruits that is shed by plants etc.A)urine is formed in kidneys through filteration of blood.the urine is passed through ureter to bladder where it is stored until its excreation

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What is role of placenta in female human?

Posted by Piyush Kumar 6 years ago

CBSE > Class 10 > Science

4 answers

♔〘Mùhükshã〙♔ . 6 years ago

It gives nourishment to the ??

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Grahul 📒🎒📓📔🙇🙇🙇 Rahul 6 years ago

To give the nourishment to the embrio

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Parul Saini 6 years ago

Placenta provides nourishment to the embryo from the mother's blood. It helps in removing waste produced by embryo and provides required nutrients for proper development of embryo.

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Nilesh Vishwakarma 6 years ago

Provide nourise and nutrient to embryo.

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What is the role of vitreous humour in our eyes. Please explain me.

Posted by Rani Mishra ??? 6 years ago

CBSE > Class 10 > Science

2 answers

Vihitha Vasireddy 6 years ago

It gives shape to the eye ball

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Neha Kothari 6 years ago

Its is the fluid which is present b/w the eye kens nd ratina .it helps to maintain the shape of the nd nourishment of the eye.

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Name tow industry based on forest produc

Posted by Seema Rattan 6 years ago

CBSE > Class 10 > Science

1 answers

Anil Shukla 6 years ago

Paper and cotton

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What is the frequency of dc supply in India..???

Posted by Aadya Singh 6 years ago

CBSE > Class 10 > Science

8 answers

Rahul Suresh 6 years ago

Neyokke ewzhi

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Broken Soul 6 years ago

Diku kya samajme ni aata?

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Kusha Lamba 6 years ago

50 Hz

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Nilesh Vishwakarma 6 years ago

Frequency 0 hoti hai It constant as straight line

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Broken Soul 6 years ago

50 Hz

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Aadya Singh 6 years ago

Maine bhi book se nhi padha h ??you tube video dekh rhi thi iska to vhi pe dekha ?

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Aadya Singh 6 years ago

Zero hota h ?50 AC ka hota h..?

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Yet Y 6 years ago

50hz sayad

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Write the functions of the given parts of human eye:(a) aqueous humour (b)retina (c)ciliary muscles (d)Pupil (e)Iris

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Abhinav Singh 6 years ago

a: Aqueous humour is less viscous liquid filled between cornea and irris. b: Retina works as screen and it contains rods and cones which help in recognition of the colour of the object and intensity of light. c: Ciliary muscles helps in adjusting the focal length of the len. d: Light enters our eyes from pupil. e: Irris is only coloured part of human eye.

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Describe, in brief, the changes that the uterus undergoes : (i)to receive the zygote(ii) if zygote is not formed.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Fertilisation is possible if mating takes place during the middle of menstrual cycle because in a normal healthy girl the ovulation takes place on the 14th day of the beginning of menstrual cycle of 28 days. The embedding of embryo in the thick lining of the uterus is called implantation. The lining thickens and is richly supplied with blood to nourish the growing embryo. If however, the egg is not fertilised, then the thick lining of the uterus is not required and the uterus lining breaks down and comes out through the ****** in the form of blood and mucous. This is called menstruation.

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What is mean by homologous series

Posted by Abhilash Anandhan 6 years ago

CBSE > Class 10 > Science

1 answers

✍️✍️✍️ ? 6 years ago

Homologous series - The two successive carbon compound that belongs to same function group differ by CH2 group having same chemical properties but different physical properties.

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I have doubt in all lessons

Posted by Saiprasad Teli 6 years ago

CBSE > Class 10 > Science

4 answers

Nilesh Vishwakarma 6 years ago

Watch vedantu .. One shot video for every lesson

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Aadya Singh 6 years ago

you*

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Aadya Singh 6 years ago

Watch videos of edumantra on you tube...It may be helpful for ??

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📕Queen 📕Queen 6 years ago

Of science

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What is meant by the term speciation? list four factors which could lead to speciation.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

2 answers

Neha Kothari 6 years ago

In speciation new species is arrived from the existing species. 4 factors that lead to speciation are 1.geographical isolation 2.genetic drift 3.variation 4.mutation

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Shubham Ojha 6 years ago

Speciation are the character of the new species which get herited from genes or dna from parents or parents cell

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The extent of duration of a Ray of light on passing through a glass prism depends on its colour.( give reason of this question)

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

The prism has split the incident white light into a band of colours. The splitting of light into its component colours is called dispersion. The white light is dispersed into its seven-colour components by a prism. Different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The red light bends the least while the violet the most.

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Explain with a suitable example, the metal used to reduce the following: (a)oxides of less reactive metals. (b)oxides of moderately reactive metals. (c)oxides of highly reactive metal.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Extraction of Less Reactive Metals:

The less reactive metals are extracted by the reduction of their oxides by heat alone.

Example: Mercury (II) sulphide ore is roasted in air when mercury (II) oxide is formed. When this mercury (II) oxide is heated to about 300° C, it decomposes to form mercury metal.

Extraction of Moderately Reactive Metals:

The moderately reactive metals in the middle of the reactivity series are extracted by the reduction of their oxides with carbon, aluminium, sodium or calcium.

It is easier to obtain metals from their oxides (by reduction) than from carbonates or sulphides. So, before reduction can be done, the ore is converted into a metal oxide. The concentrated ores can be converted into metal oxides by the process of calcination or roasting.

Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert it into a metal oxide.

For example: When zinc carbonate is heated strongly in the absence of air, it decomposes to form zinc oxide and carbon dioxide. Roasting is the process in which a sulphide ore is strongly heated in the presence of air to convert it into a metal oxide.

Extracting Metals towards the Top of the Activity Series:

Metals high up in the reactivity series are very reactive. These metals have a strong affinity for oxygen. So, oxides of sodium, magnesium, calcium and aluminium cannot be reduced by carbon.

These metals are obtained by electrolytic reduction.

Sodium, magnesium and calcium are obtained by the electrolysis of their molten chlorides.

Example: Sodium metal is extracted by the electrolytic reduction of molten sodium chloride. When electric current is passed through molten sodium chloride, it decomposes to form sodium metal and chlorine gas.

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What is dispersion of white light? State its cause

Posted by Naina ?..... 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Dispersion of light is the phenomenon of splitting of a beam of white light into its seven constituent colours on passing through a glass prism. The band of coloured components of a light beam is called its spectrum. The cause of dispersion is that different colours of white light with different wavelengths undergo different deviations on passing through a glass prism.

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State one reason for the following: (a) Potato Chips manufacturers usually flush bags of chips with Nitrogen gas.(b) Iron particles lose their Shine gradually. (c) Foods should be kept in airtight containers.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science

1 answers

Parul Saini 6 years ago

(a)Nitrogen prevents potato chips from rancidity (b)Iron particles undergoes corrosion i.e. slow decay of metals due to atmospheric gases and moisture (c)Airtight containers prevent food from rancidity i.e. oxidation of fats and oils due to air and moisture resulting in bad smell and taste

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Would you place the two isotopes of chlorine CL- 35 and CL- 37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? justify your answer.

Posted by Nitin Tiwari 6 years ago

CBSE > Class 10 > Science