Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
A. prevent goiter B. prevent tooth decay C. remove odour D. kill germs Correct Answer: Option C – remove odour Explanation Activated Carbon filters are excellent at removing chlorine and related poor taste and...
On the basis of the electrochemical series; which of these ions will show the greater tendency to be discharged at the cathode in an electrolytic cell?
A. cu2+ B. sn2+ C. fe2+ D. zn2+ Correct Answer: Option A – cu2+ Explanation The arrangement of elements in order of increasing electrode potential values is called electrochemical series. K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sn > Pb...
A chemical widely used as a fertilizer is?
A. galena B. bauxite C. emerald D. nitrochalk Correct Answer: Option B – bauxite Explanation Bauxite ore can help you add all of these essential nutrients to your soil.
Addition of sodium chloride to water to form a solution would lead to?
A. increase in freezing point and increase the boiling point B. increase in freezing point and decrease the boiling point C. decrease in freezing point and decrease the boiling point D. decrease in freezing point and increase the boiling point Correct Answer: Option D...
An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?
A. C2H5OH B. C3H4 C. C6H6 D. CH3COOH Correct Answer: Option D = CH3COOH Explanation Carboxylic acids and enols react with sodium bicarbonate to liberate carbon dioxide. E,g CH3COOHProducts
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