set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which among the following atoms has high atomic radi?

a) Rb

b) K

c) Na

d) Cs

Question : 2

The scientist who made maximum contribution towards periodic table was

a) Rutherford

b) Dalton

c) Chadwick

d) Mendeleev

Question : 3

According to Newland’s law of octaves, which element is the repetition of the first element in the periodic table?

a) Nitrogen

b) Chlorine

c) Oxygen

d) Sulphur

Question : 4

The early attempt to classify elements as metals and nonmetals was made by

a) Lother Meyer

b) Lavoisier

c) Mendeleev

d) Henry Moseley

Question : 5

Which of the following is/are the example/examples of chemical change?

1. Crystallization of sodium chloride
2. Melting of ice
3. Souring of milk

a) Only 3

b) 1, 2 and 3

c) Only 1 and 2

d) None of the above

Question : 6

Why does water boil at a temperature below 100ºC at higher altitudes?

a) The gravitational attraction is less

b) Because of heavy winds in mountains

c) The atmospheric pressure decreases and hence boiling point is lowered

d) None of the above is correct