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

Question : 16 [PSC (Pre) 2016]

To develop photographic plates

a) Free Bromine releases

b) Light affected area quickly oxidizes

c) Sodium thiosulphate is used as oxidising agent

d) The solution is kept developing until all the Bromide is not dissolved

Question : 17

Acid turn blue litmus –

a) red

b) yellow

c) green

d) orange

Question : 18

Natural indicator litmus is extracted from

a) earthworms

b) ants

c) lichens

d) algae

Question : 19 [RAS/RTS (Pre) 1999]

When eno salt is poured into the water, bubbles forms, which is due to

a) $CO_2$ gas

b) CO gas

c) $O_2$ gas

d) $H_2$ gas

Question : 20

Which of the following is not required to find the pH of a given sample ?

a) Litmus paper

b) Universal indicator

c) pH paper

d) Standard pH chart