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

What volume of oxygen would be required for complete combustion of 100L of ethane according to the following equation?
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

The reaction 4N₂O + CH₄ → CO₂ + 2H₂O + 4N₂ takes place in the gaseous state. If the volumes of all the gases are measured at the same temperature, and pressure, calculate the volume of dinitrogen oxide (N₂O), required to give 150cm³ of steam.

The percentage composition of sodium phosphate, as determined by analysis is : 42.1% Na, 18.9% P, 39% of O. Find the empirical formula of the compound.
[H =1, N =14, Na = 23, P = 31, Cl = 35.5, Pt = 195]

Determine the empirical formula of a compound containing 47.9‰ K, 5.5‰ beryllium and 46.6‰ fluorine by mass.

A compound 'X' consists of 4.8% of C and 95.2% of Br by mass.
Determine the empirical formula of this compound.
[C = 12, Br = 80]

Calcium carbide is used for the artificial ripening of fruits. Actually the fruit ripens because of the heat evolved while calcium carbide reacts with the moisture. During this reaction calcium hydroxide and acetylene gas are formed. If 200 cm³ of acetylene is formed from a certain mass of calcium carbide, find the volume of oxygen required and carbon dioxide formed during the complete combustion. The combustion reaction can be represented as below.

\[\ce{2C2H2_{(g)} + 5O2_{(g)}-> 4CO2_{(g)} + 2H2O_{(g)}}\]

Calculate the percentage of water of crystallization in CuSO_4. 5H₂O
(H = 1, O = 16, S = 32, Cu = 64)

A compound of X and Y has the empirical formula XY₂. Its vapour density is equal to its empirical formula weight. Determine its molecular formula.

Propane burns in air according to the following equation:

\[\ce{C3H8 + 5O2 -> 3CO2 + 4H2O}\]

What volume of propane is consumed on using 1000 cm³ of air, considering only 20% of air contains oxygen?

Name the following:
Drying agent used to dry hydrogen chloride.

Name the following:
Salt obtained by heating sodium chloride with concentrated sulphuric acid below 200 degree celcius.

Name the following:  
Gas obtained by treating ferrous sulphide with hydrochloric acid.

Name the following:
Five oxidizing agents that liberated chlorine from concentrated hydrochloric acid.

Name the following: 
A chemical in which gold can be dissolved.

Name the following:
A metallic oxide which reacts with hydrochloric acid to give a coloured solution.

What would happen if
Calcium oxide is used to dry hydrogen chloride.

State the use of aqua-regia.

What is the function of HCI in preparation of aqua-regia?

Fill in the blank:
On addition of silver nitrate to hydrochloric acid ___________ precipitate is formed which is soluble in  ____________

1. What must be added to sodium chloride to prepare hydrogen chloride?
2. Write the equation for the reaction which takes place in question (a).