MEDIUM
UPSC CDS
IMPORTANT
Earn 100

Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?
(a)A O2 ; B — CaCO3
(b)A — CO2 ; B — Ca(OH)2
(c)A — O2 ; B — Ca(OH)2
(d)A — CO2 B — CaCO3

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Important Questions on UPSC CDS (I) Previous Year Paper 2021
EASY
UPSC CDS
IMPORTANT
How many internal reflections of light take place in the formation of primary rainbow ?

MEDIUM
UPSC CDS
IMPORTANT
The direction of acceleration in uniform circular motion is along the _____.

MEDIUM
UPSC CDS
IMPORTANT
The weight of an object is due to _____.

MEDIUM
UPSC CDS
IMPORTANT
The size of particles being studied in `nanotechnology' is about _____.
