Building Materials
Priming consists of

8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
One part of white lead, 8 parts of chalk and one part of linseed oil
None to these
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil

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Building Materials
Assertion A : Paints with white lead base are not recommended for painting of iron works.Reason R : Paints with white lead base do not check rusting of iron.Select your answer according to the coding system given below:

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

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