acids, bases, salts and metals - Category wise Question and Answer Practice Test with Solutions

Question : 21 [CDS]

The pH of fresh ground water slightly decreases upon exposure to air because

a) the dissolved carbon dioxide of the ground water escapes into air

b) carbon dioxide from air is dissolved in the water

c) oxygen from air is dissolved in the water

d) the dissolved oxygen of the ground water escapes into air

Question : 22

Which of the following is a strong acid:

a) Citric acid

b) Nitric acid

c) Acetic acid

d) Tartaric acid

Question : 23

Which of the following acid is present in sour milk ?

a) lactic acid

b) citrus acid

c) glycolic acid

d) tartaric acid

Question : 24

Calamine solution contains

a) zinc carbonate

b) sodium hydrogen carbonate

c) zinc hydroxide

d) magnesium hydroxide

Question : 25 [CDS]

Food cans are coated with tin and not with zinc because

a) zinc is more reactive than tin.

b) zinc is costlier than tin.

c) zinc has a higher melting point than tin.

d) zinc is less reactive than tin.