Chemistry Questions and Answers Pdf - 1

Question: 1

Helium is preferred to hydrogen in air balloons because it

(A) Does not form an explosive mixture with air

(B) Has greater lifting power

(C) Is less dense

(D) Is cheaper

Question: 2

Which one of the following statements is not true about cosmic rays?

(A) They have very short wavelength

(B) They are made of highly energetic charged particles

(C) They originated from the sun

(D) They are electromagnetic waves

Question: 3

Acid rains is caused due to emission of which of the following into the atmosphere?

(A) Carbon monoxide and nitrogen

(B) Ozone and carbon dioxide

(C) Carbon dioxide and carbon monoxide

(D) Oxides of nitrogen and sulphur

Question: 4

Biogas mainly consists of

(A) Carbon dioxide and methane

(B) Hydrogen and oxygen

(C) Hydrogen and methane

(D) Carbon dioxide and hydrogen

Question: 5

While tinning of brass utensils, the ammonium chloride powder used to clean the hot utensil produces fumes of

(A) Ammonia and hydrochloric acid

(B) Hydrochloric acid

(C) Carbon monoxide

(D) Ammonia