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

Ha...maine bhi ye dekha tha google pe...btt vo official website ni thi...aur vha pe saaf saaf likha tha....dates will be revisied after an official update by CBSE.

2Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

And meri help kriyo...Asmita... okay

1Thank You

Aadya Singh ? 6 years, 3 months ago

But date sheet to official websites release karti h...school thode hi...?

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Ohkk Dear Ashmita Sis ..we all 4 Brothers welcome you......

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Asmilo Hall 6 years, 3 months ago

Our schl has announced the date

4Thank You

Ananya Kale 6 years, 3 months ago

No ot is not announced yey....

2Thank You

Aadya Singh ? 6 years, 3 months ago

Ash abhi date sheet ni aayi h...aapne kha se dekh li..?

2Thank You

Asmilo Hall 6 years, 3 months ago

Mai hu na Bhaiya, apki chti bhn

3Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Ohkkk thnx...nd mai yaha kisi ko Sister nhi banata...yaha ki sis pe se bhi bharosha uth gya h....ek baar aditi ko sis banaya uske baad se wo gyab ho gai....nd one thing sach me meri sagi behen ek bhi nhi h?

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Asmilo Hall 6 years, 3 months ago

Ravi Bhaiya

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Notification me dkh lo name

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Asmilo Hall 6 years, 3 months ago

Mr AD what's ur name

2Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Okay Asmita...mai 11 th me hu mera bhai ka board h.....

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Asmilo Hall 6 years, 3 months ago

Asmita

2Thank You

Shivam Mishra 6 years, 3 months ago

Itni late mujhe lga feb se start honge

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Asmilo Hall 6 years, 3 months ago

Then

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

What's ur nm

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Shivam Mishra 6 years, 3 months ago

Ash 7 march se start he

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...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

No no ....

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Asmilo Hall 6 years, 3 months ago

R u in 10th cls?

2Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Ohkk Ash .

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Asmilo Hall 6 years, 3 months ago

1st exam is Maths

2Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

0Thank You

Asmilo Hall 6 years, 3 months ago

7th March se starting

2Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Ohhk shiv

1Thank You

Shivam Mishra 6 years, 3 months ago

Nhi bhai abhi nhi ayi he date sheet

1Thank You

...Mr A.D.21..♥️? ( Tomorrow Will Be Last Day) 6 years, 3 months ago

Ohhk mera bhai to bol rha tha sayad aagai

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❄️ Queen ❄️ 6 years, 3 months ago

Pta nahi...??

1Thank You

ANSWER

If you could anany source of energy for heating your food which one would you prefer? State one reason for your choice

Posted by Anchal Thakur 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Aviral Goyal 6 years, 3 months ago

LPG

0Thank You

Ananya Kale 6 years, 3 months ago

Do not praduce smoke and do not pollute environment

0Thank You

Ananya Kale 6 years, 3 months ago

LPG

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Aadya Singh ? 6 years, 3 months ago

Cooking gas like LPG because they don't produce smoke.

1Thank You

ANSWER

How many structural isomers can u draw from pentane?

Posted by Ananya Kale 6 years, 3 months ago

CBSE > Class 10 > Science

14 answers

Anchal Patel 6 years, 3 months ago

3 ☺☺☺

1Thank You

Nawal Jha Jha 6 years, 3 months ago

0Thank You

Tanu Priya 6 years, 3 months ago

3 structural isomer can be drawn for pentane

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Ananya Kale 6 years, 3 months ago

Give me some tips for study Ple...

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Ananya Kale 6 years, 3 months ago

But pura lesson nahi padh pati

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Ananya Kale 6 years, 3 months ago

S i use s chand

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❄️ Queen ❄️ 6 years, 3 months ago

Ncert k aalawa koi bhi book.....like s.chand ....??

1Thank You

Aadya Singh ? 6 years, 3 months ago

Mtlb jaise....S chand ki book

1Thank You

Ananya Kale 6 years, 3 months ago

Side book matlab

1Thank You

Ananya Kale 6 years, 3 months ago

1Thank You

Aadya Singh ? 6 years, 3 months ago

Aap agar side book se study karogi to sare question k answer mil jayenge...i think aap only ncert hi padhti ho...?

1Thank You

Ananya Kale 6 years, 3 months ago

I think that i am very weak in studies

2Thank You

❄️ Queen ❄️ 6 years, 3 months ago

Three structure of isomers are posible for pentane.?

1Thank You

Aadya Singh ? 6 years, 3 months ago

2Thank You

ANSWER

Difference betwen soap and detergents.

Posted by Ananya Kale 6 years, 3 months ago

CBSE > Class 10 > Science

19 answers

Ananya Kale 6 years, 3 months ago

Hmare pre board Do january oek feb main he

0Thank You

Tanu Priya 6 years, 3 months ago

Soap can act only in soft water .. while detergent can act in both hard and soft water...

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❄️ Queen ❄️ 6 years, 3 months ago

Mere test khatm....ap pre board kb hh yeh nahi braya ..

1Thank You

Aadya Singh ? 6 years, 3 months ago

Is time to mera daily hi test hota rehta h...?

1Thank You

Ananya Kale 6 years, 3 months ago

Apke kb hai

1Thank You

Ananya Kale 6 years, 3 months ago

Thank u guys

2Thank You

Aadya Singh ? 6 years, 3 months ago

Yes...suhana is right...and all the best...?

2Thank You

❄️ Queen ❄️ 6 years, 3 months ago

Aareee.. . tension mt lo....kl exam hh n ghar se smile kr k niklna aur paper achcha kr k ana.....aaal the best...???

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❄️ Queen ❄️ 6 years, 3 months ago

4) soap are biodegradable......4) most of the detergent are non- biodegradable.

1Thank You

❄️ Queen ❄️ 6 years, 3 months ago

3) soap have relatively weak cleansing action......3) detergent have strong cleansing action.

1Thank You

Ananya Kale 6 years, 3 months ago

Tommorow exam is there Lot of tension

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❄️ Queen ❄️ 6 years, 3 months ago

2) soap are not suitable for washing with hard water... . 2) detergent are suitable for both hard water and soft water.

1Thank You

Ananya Kale 6 years, 3 months ago

Thanks??

1Thank You

❄️ Queen ❄️ 6 years, 3 months ago

1) soap ? contain sodium carboxylate (COONa) group. 1) detergent contain sodium sulphonate (SO3Na) group.

2Thank You

Aadya Singh ? 6 years, 3 months ago

In the first point, there is 'or' in place of ot.

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Aadya Singh ? 6 years, 3 months ago

4) Soaps have relatively weak cleansing action while detergents have a strong cleansing action.

4Thank You

Aadya Singh ? 6 years, 3 months ago

3) Soaps are biodegradable while some of the detergents are not biodegradable.

4Thank You

Aadya Singh ? 6 years, 3 months ago

2) Soaps are not suitable for washing purposes when the water is hard while detergents can be used for washing even when the water is hard.

3Thank You

Aadya Singh ? 6 years, 3 months ago

1) Soaps soaps are the sodium salt of the long chain carboxylic acid while detergents are the sodium salt of the long chain benzene sulphonic acids ot long chain alkyl hydrogen sulphates.

4Thank You

ANSWER

Define covalent bond. Explain it.

Posted by Ankit Bachchhav 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Anchal Patel 6 years, 3 months ago

The chemical bond formed by sharing of electrons between two atoms is known as covalent bond

1Thank You

Jatin Papanai 6 years, 3 months ago

Bonds formed by equal sharing of electrons by 2 or more combining atoms

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Aadya Singh ? 6 years, 3 months ago

The chemical bond which is formed by the sharing of electrons between two atoms is known as covalent bond.

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Nirvaid Jain 6 years, 3 months ago

Atoms which have the tendency to share electrons .When sharing of electrons happen between two elements then it is said to be covalent bond. Eg- H2 H - contain 1 electron So to complete its valence shell it needs 1 more electron So now it will share its one electron with another H atom Then 2H atoms both will have 2electrons which will complete valence shell of both the atoms The bond which they share is covalent bond

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ANSWER

A reddish brown metal x when heated in the presence of oxygen forms a black compound y which is basic in nature when heated with hydrogen gas gives back x. Identify x and y.write chemical reaction between y and hydrogen identify the substance being oxidized and reduced.

Posted by ?? Thakur 06 ???? 6 years, 3 months ago

CBSE > Class 10 > Science

5 answers

❄️ Queen ❄️ 6 years, 3 months ago

The substance x is copper .On heating in air , it form copper Oxide Y.

3Thank You

Roman ? Shivansh ?? ( Every Day Is A New Day ) 6 years, 3 months ago

Ooo aadya you will be a CBSE topper this year ?

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Aadya Singh ? 6 years, 3 months ago

Copper oxide is reduced to Cu and hydrogen is oxidized to H2O

4Thank You

Aadya Singh ? 6 years, 3 months ago

CuO + H2 ---------------> Cu + H2O

4Thank You

Aadya Singh ? 6 years, 3 months ago

X - copper and Y - Copper oxide.

3Thank You

ANSWER

What are anti oxidants? Name any two substances which are usually used as anti oxidants

Posted by Aditya Arya 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years, 3 months ago

Antioxidants are reducing agents that prevent oxidation of fats and oil .They are added to prevent them from turning rancid due to oxidation. Example - Butylated Hydroxyanisole and Butylated Hydroxytolune.

2Thank You

ANSWER

What r isomers? Give examples.

Posted by Ananya Kale 6 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Aradhana Singh 6 years, 3 months ago

The organic compound having same molecular formula but different structure is called isomer .. For ex.butane and hexane

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Ananya Kale 6 years, 3 months ago

1Thank You

Aadya Singh ? 6 years, 3 months ago

My pleasure...?

2Thank You

Ananya Kale 6 years, 3 months ago

Thanks

1Thank You

Aadya Singh ? 6 years, 3 months ago

The organic compound having the same molecular formula but different structures are known as isomers. Normal-butane and iso-butane are 2 examples of isomers because they have the same molecular formula but different structures.

3Thank You

ANSWER

Different between pollen tube and stigma

Posted by Anwar Khan 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Chahat Karia 6 years, 3 months ago

Pollen tube is present inside the stigma. Also pollen tube is not a part of the female reproductive system. It is a part of the pollen grain ( male reprodctive part ) and stigma is the female reproductive part. Pollen grain makes a pollen tube to reach the ovum present in the ovary for reproduction.

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ANSWER

What is peristaltic movements ?

Posted by Megha Janghel 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years, 3 months ago

The contraction and relaxation of the muscles in food pipe which brings the food down the pipe and into the stomach is called peristaltic movement.

5Thank You

ANSWER

What is meant by alioripy

Posted by H & L Creations 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Dilution of an acid HCl +H2O---------->

Posted by ? ???? 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years, 3 months ago

HCL + H2O ---------------> Cl + H3O+

4Thank You

ANSWER

State two properties of each following metals which make the suitable for first copper and aluminium for making electric wires second gold platinum and silver are used to making jewellery third copper is to make hot water tanks for graphite in making electrodes v metal used to making bells and spring of musical instrument

Posted by Ãmäñ Goswami 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Aadya Singh ? 6 years, 3 months ago

Graphite is used for making electrodes also because it is good conductor of electricity.

3Thank You

Aadya Singh ? 6 years, 3 months ago

1) Copper and aluminum are used for making electric wire because they are good conductor of electricity and cheap. 2) Gold and silver are used for making jewellery because they are very lustrous. They are very less reactive and Don't corrode easily. 3)Copper is used for making hot tanks because it is the best conductor of heat and doesn't react with water. 4) Graphite is used for making electrodes because it is insoluble in acid, water ,bases and is non-corrosive metal. 5) Metal are used to making bells and strings of musical wire because they are sonorous, i.e., they produce sound when struck with hard object.

4Thank You

ANSWER

Carbon does not exist in C4+ and c4- form? Give reason

Posted by Chinmay Goel 6 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Tanu Priya 6 years, 3 months ago

Carbon does not exist in C4+ and C4- form because it has then 6 proton and 10 electron . And it is very difficult for 6 proton to hold 10 electron .whereas it even do not exist in C4+ form because large a amount of energy is required to lose 4 electron.

1Thank You

Rachit Yadav 6 years, 3 months ago

Because ithave a stable and it is covlent bond

1Thank You

Prateek Vishwakarma 6 years, 3 months ago

Because it has tendency to share electron by which it can ethier form negative ion or positive ion.

1Thank You

Adi Karare 6 years, 3 months ago

It would be unstable if it aquire C4+ orC4- form so to be stable carbon shares it electrons and makes covalent bond

1Thank You

Aradhana Singh 6 years, 3 months ago

It is covalent bond ... It cannot gain or loss