a) Sodium hydroxide and Sodium hydride
b) Sodium sulphite and Sodium sulphate
c) Sodium sulphate and Sodium hydroxide
d) Sodium hydride only
Answer: a
Explanation: A solution of sodium hydroxide and sodium hydride is also known as the white liquor. It is widely used in the chemical pulping industry for cooking the wood chips, hence, also called cooking liquor.
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