When the soil is too basic, plants do not grow well in it. To
improve its quality what must be added to the soil?
(a) Organic matter
(b) Quick lime
(c) Slaked lime
(d) Calamine solution
Phenolphthalein is a synthetic indicator and its colours in
acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink
Turmeric is a natural indicator. On adding its paste to acid
and base separately, which colours would be observed
(a) Yellow in both acid and base.
(b) Yellow in acid and red in base.
(c) Pink in acid and yellow in base.
(d) Red in acid and blue in base.
Products of a neutralisation reaction are always
(a) an acid and a base.
(b) an acid and a salt.
(c) a salt and water.
(d) a salt and a base
The correct way of making a solution of acid in water is to
(a) add water to acid.
(b) add acid to water.
(c) mix acid and water simultaneously.
(d) add water to acid in a shallow container
While constructing a house in a coastal area, in which direction
should the windows preferably face and why?
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