EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
Earn 100

The weight of calcium oxide formed by burning 20 g of calcium in excess oxygen is:

14.29% studentsanswered this correctly

Important Questions on Mole Concept - 1

EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
By dissolving 0.35 mole of sodium chloride in water, 1.30 L of salt solution is obtained. The molarity of the resulting solution should be reported as:
EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
Upon mixing equal volumes of aqueous solutions of 0.1 M HCl and 0.2 M H2SO4, the concentration of H+ in the resulting solution is:
EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
The amount of metallic Zn (Atomic weight =65.4) required to react with aqueous sodium hydroxide to produce 1 g of H2, is
MEDIUM
KVPY Aptitude Test - Stream SA
IMPORTANT
Natural abundances of C12 and C13 isotopes of carbon are 99% and 1%, respectively. Assuming they only contributes to the molecular weight of C2F4, the percentage of C2F4 having a molecular mass of 101 is
EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
The volume of oxygen at STP required to burn 2.4 g of carbon completely is
EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
Complete reaction of 2.0 g of calcium (atomic weight =40) with excess HCl produces 1.125 L of H2 gas. Complete reaction of the same quantity of another metal M"" with excess HCl produces 1.85 L of H2 gas under identical conditions. The equivalent weight of M"" is closest to:
EASY
KVPY Aptitude Test - Stream SA
IMPORTANT
Three successive measurements in an experiment gave value 10.9,11.4042 and 11.42 the correct way of reporting the average value is
MEDIUM
KVPY Aptitude Test - Stream SA
IMPORTANT
The ammonia evolved from 2 g of a compound in Kjeldahl's estimation of nitrogen neutralizes 10 mL of 2 M H2SO4 solution. The weight percentage of nitrogen in the compound is: