Building Materials
Assertion A : Pure lime takes a long time to develop adequate strength.Reason R : Pure lime has slow hardening characteristics.Select your answer according to the coding system given below:

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

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Building Materials
Putty is

Softened by a solution of pearl ash and quick-lime soaked in water
All listed here
Used for fixing glass panes
Made with finely powdered chalk and linseed oil

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