Question

6. What happens when an alkali such as NaOH is added to the following solutions?
b) aqueous solution of ferrous sulphate
(c) aqueous solution of zinc sulphate​

Answer 1

Answer:

ANSWER

When sodium hydroxide solution is added drop by drop to zinc sulphate solution a white precipitate is formed which is soluble in excess of sodium hydroxide. 

ZnSO4+2NaOH→Zn(OH)2+Na2SO4 

Zn(OH)2+2NaOH→Na2ZnO2+2H2O

Therefore, option A is correct.

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Answer 2

Answer:

নবম শ্রেণীর কারিগরি ভোকেশনাল ইঞ্জিনিয়ারিং প্রশ্ন