English Medium Class 10 - CBSE Question Bank Solutions

If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?

Name a metal for the given case:

It does not react with cold as well as hot water but reacts with steam.

Name a metal for the given case:

It does not react with any physical state of water.

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?

A zinc plate was kept in a glass container having CuSO₄ solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.

Name a carbon containing molecule which has two double bonds.

What would be the electron-dot structure of carbon dioxide which has the formula CO₂?

What type of chemical bond is formed between:

Carbon and bromine

What type of bond is present in hydrogen chloride?

Write the electron-dot structure for the following molecule:

Cl₂

What type of bonds are present in a water molecule?

What type of bond is present in methane (CH₄)?

State one major difference between covalent and ionic bonds.

What type of bond is present in the following molecule?

H₂

What type of bond is present in the following molecule?

CH₄

What type of bond is present in the following molecule?

Cl₂

The form of carbon which is known as black lead is ______.

What type of bond is present in the following molecule?

O₂

Which inert gas electron configuration do the Cl atoms in Cl₂ molecule resemble? What is this electron configuration?