Question

A solution of a substance ‘X’ is used for whitewashing.

(i) Name the substance ‘X’ and write its formula.

(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
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Answer 1

Answer:

1. CaCO3

2. CaCO3 + H2O gives Ca(OH)2

Answer 2

$\huge\red{h}\pink{o}\orange{l}\green{l}\blue{a}$

Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. ... High optical power corresponds to short focal length.

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