EASY
11th Maharashtra Board
IMPORTANT
Earn 100

Calculate the number of moles of magnesium oxide in 10 g of the compound MgO. (Average atomic masses of Mg=24 and O=16)

Important Questions on Some Basic Concepts of Chemistry

EASY
11th Maharashtra Board
IMPORTANT
What is volume of carbon dioxide, CO2 occupying by 5 moles of CO2 gas measured at STP.
EASY
11th Maharashtra Board
IMPORTANT
What is volume of carbon dioxide, CO2 occupying by 0.5 mole of CO2 gas measured at STP.
HARD
11th Maharashtra Board
IMPORTANT

Calculate the mass of potassium chlorate required to liberate 6.72 dm3 of oxygen at STP. Molar mass of KClO3 is 122.5 g mol-1.

HARD
11th Maharashtra Board
IMPORTANT

Calculate the number of atoms of hydrogen present in 5.6 g of urea, (NH2)2CO. Also calculate the number of atoms of N, C and O.

HARD
11th Maharashtra Board
IMPORTANT

Calculate the mass of sulphur dioxide produced by burning 16 g of sulphur in excess of oxygen in contact process. (Average atomic mass : S=32 u, O=16 u)

HARD
11th Maharashtra Board
IMPORTANT

Explain the need of the term average atomic mass.

MEDIUM
11th Maharashtra Board
IMPORTANT

Explain molar mass.

MEDIUM
11th Maharashtra Board
IMPORTANT

Explain mole concept.