A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is?
A. Zn²+ B. Pb²+ C. Ca²+ D. Al³+ Correct Answer: Option C – Ca²+
A compound that gives a brick-red colour to a non-luminous flame is likely to contain?
A. copper ions B. sodium ions C. calcium ions D. aluminium ions Correct Answer: Option C – calcium ions
In the electrolytic extraction of calcium from calcium chloride, the cathode is?
A. zinc B. graphite C. platinum D. iron Correct Answer: Option D = iron
In the extraction of sodium from fused sodium chloride, the anode is made of platinum because?
A. sodium is formed at the anode B. chlorine is formed at the anode C. sodium does not react with platinum D. chlorine does not react with platinum Correct Answer: Option C = sodium does not react with platinum Explanation Because platinum is resistant to chlorine and...
Fluorine does not occur in the free state in nature because?
A. it is a poisonous gas B. it belongs to the halogen family C. it is inert D. of its high reactivity Correct Answer: Option D = of its high reactivityProducts
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