(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure

1) Find the number of moles of hydrogen present.

2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)

3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO₂ molecules in the cylinder under the same conditions of temperature and pressure.

4) State the law that helped you to arrive at the above result.

Name the following:

A metal oxide that can be reduced by hydrogen.

Complete the following by selecting the correct option from the choices given:

The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ____________. (Fe/Mg/Pb/Al)

_____________ (AgCl / PbCl₂), a white precipitate is soluble in excess NH₄OH

Choose the correct answer from the options given below:

The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is:

[Given that H = 1, O = 16]

State your observations when barium chloride solution is mixed with sodium sulphate solution.

Match the salts given in Column I with their method of preparation given in Column II.

Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas produces dense white fumes with ammonia gas.

Give appropriate scientific reasons for Zinc oxide can be reduced to zinc metal by using
carbon, but aluminium oxide cannot be reduced by a reducing agent

Give appropriate scientific reasons for Carbon tetrachloride does not conduct electricity.

Explain the bonding in methane molecule using electron dot structure.

Choose the most appropriate answer from the following list of oxides which fit the description.

A covalent oxide of a metalloid.

Name the following:

The property of element by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure.

An element L consists of molecules.

What type of bonding is present in the particles that make up L?

An element L consists of molecules.

When L is heated with iron metal, it forms a compound, FeL. What chemical term would you use to describe the change undergone by L?

State your observation when excess sodium hydroxide is added to calcium nitrate solution

Give balanced chemical equation to prepare the following salt:

Copper chloride using copper carbonate

1. The percentage composition of a gas is:
   Nitrogen 82.35%, Hydrogen 17.64%.
2. Find the empirical formula of the gas. [N = 14, H = 1]

Define a covalent bond.