set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of

a) conservation of mass

b) multiple proportions

c) constant proportions

d) reciprocal proportions

Question : 2

Members of which of the following have similar chemical properties ?

a) Isobars

b) Allotropes

c) Isotope

d) Both isotopes and allotropes

Question : 3

An a-particle consists of which of the following?

a) 2 protons and 4 neutrons

b) 1 proton and 1 electron

c) 2 protons and 2 neutrons

d) 1 proton and 1 neutron

Question : 4

What is the mass (in grams) of 3 moles of N?

a) 42

b) 28

c) 14

d) 56

Question : 5

How many moles of hydrogen atom are present in one mole of Aluminium hydroxide ?

a) Three moles

b) Two moles

c) one mole

d) Four moles

Question : 6

Which of the following carries a negative charge?

a) Alpha particles

b) Beta particles

c) X-rays

d) Gamma rays