Q. Give some examples of secondary standard substance?

Ans.      Sodium hydroxide, Hydrochloric acid etc.

Q. Give some examples of primary standard substance?

Ans. Oxalic acid, Mohr’s salt, anhydrous sodium carbonate etc.

Q. What is secondary standard substance?

Ans. A substance available in low degree of purity, unstable & affected by air (gains & loses moisture in air).

Q. What is primary standard substance?

Ans. A substance available in high degree of purity, stable & unaffected by air (does not gain & lose moisture in air).

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