Building Materials
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting.Reason R : Turpentine oil is costlier than other thinners.Select your answer according to the coding system given below:

A is true but R is false
Both A and R is true and R is the correct explanation of A
A is false but R is true
Both A and R is true but R is not the correct explanation of A

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Building Materials
In the method of condensation polymerization,

The reaction proceeds with an evolution of ammonia
All of these
Low-molecular substances are removed from the high molecular substance
The reaction proceeds with an evolution of hydrogen chloride

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