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

What is the vapour density of ethylene? (Avogadro's number = 6 x 10²³; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)

Calculate the percentage of sodium in sodium aluminium fluoride (Na₃AIF₆).
[F = 19, Na = 23, Al = 27]

A compound 'X' consists of 4.8% of C and 95.2% of Br by mass.
If the vapour density of the compound is 252, what is the molecular formula of the compound?

A compound 'X' consists of 4.8% of C and 95.2% of Br by mass. 
Name the type of chemical reaction by which X can be prepared from ethane.

The equation for the burning of octane is:

\[\ce{2C6H18 + 25O2 -> 16CO2 + 18H2O}\]

If the relative molecular mass of carbon dioxide is 44, what is the mass of carbon dioxide produced by burning two moles of octane?

A certain gas 'X' occupies a volume of 100 cm³ at S.T.P. and weighs 0.5 g. Find its relative molecular mass.

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.

1. Write the equation for the reaction.
2. What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).
3. What is the volume of carbon dioxide liberated at STP?
4. What mass of calcium chloride is formed? (Relative molecular mass of calcium chloride is 111).
5. How many moles of HCl are used in this reaction?

Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C₃H₅).
(Atomic mass: C = 14, O = 16, H = 1, Molar Volume = 22.4 dm³ at STP.)

Give one word or phrase for the following:

The ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure.

Give one word or phrase for the following:

Formation of ions from molecules.

Complete the following calculations. Show working for complete credit :
 If the empirical formula of a compound is CH and it has a vapour density of 13, find the molecular formula of the compound.

A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula.
[C = 12, H = 1]

Name the following:
Two solutions that yields white precipitates, when treated with hydrogen chloride or hydrochloric acid.

Explain, why silver nitrate crystals are dissolved in distilled water and not in tap to prepare silver nitrate solution as a laboratory reagent.
Give one chemical test to distinguish between dilute hydrochloric acid and dilute sulphuric acid.

State what you see, when siIver nitrate solution is added to dilute HCl.

Hydrogen chloride dissolves in water to form an acidic solution.
Give three distinct tests (apart from using an indicator) you would carry out with this solution to illustrate the typical properties of an acid.

Write equation for the reaction between hydrochloric acid of the following: Lead nitrate solution

Name one lead compound that can be used to oxidize hydrogen chioride to chIorine.

What happens when dilute hydrochloric acid is added to Iead nitrate solution ?

What happens when dilute hydrochloric acid is added to Iead nitrate solution ?