Introduction to fundamental Concepts

Methanol burns according to following equation

2CH3OH + 3O2 →2CO2 +4H2O

If 1 mole of methanol is burnt in oxygen, then how many moles of water are produced

• 4 moles

• 3 moles

• 2 moles

• 1 moles

The number of moles of O2 produced by thermal decomposition of 245 g of KClO3

by following equation are

2KClO3 →2KCl + 3O2 (Mol mass.of KClO =122.5gmol -1 )

• 2 moles

• 3 moles

• 6 moles

• 4 moles

The reactant left un-used after completion of reaction is known as

• Reactant in excess

• Non limiting reactant

• Limiting reactant

• Both “a” and “b”

The quantity of a product that is actually produced in a chemical reaction is called

the ___

• Theoretical yield

• Expected yield

• Actual yield

• %age yield

50g lime stone (CaCO3) is heated to give 14g CaO in a chemical reaction. What will

be the %age yield of this reaction?

(mol.massof CaCO3 = 100gmol -1

CaCO3→CaO + CO2 )

• 75%

• 40%

• 56%

• 50%

8g of gas “X” occupies 11.207dm

3 volume at STP. The gas “X” will be

• CO

• NO2

• CO2

• CH4

Mass of water in 100 moles of ice is

• 0.18 Kg

• 180 Kg

• 1.8 Kg

• 18 Kg

The relative atomic mass of chlorine is 35.5 amu. what is the mass of 2 mole of

chlorine gas

• 35.5g

• 71g

• 34g

• 142g

The Na2CO3 has 106 g. This is called its

• Atomic mass

• Molecular mass

• Isotopic mass

• Formula mass

The volume occupied by 4.4 g of CO2 gas at S.T.P is

• 2.24 dm3

• 1.12 dm3

• 4.48dm3

• 3.36 dm3