Which one of the following metals does not form amalgams?
- (a)Zinc
- (b)Copper
- (c)Magnesium
- (d)Iron
Show answerHide answer
Official answer(d) Iron
Other questions on Chemistry
Artificial way of causing rainfall to reduce air pollution makes use of
- (a)silver iodide and potassium iodide
- (b)silver nitrate and potassium iodide
- (c)silver iodide and potassium nitrate
- (d)silver nitrate and potassium chloride
Show answerHide answer
Official answer(a) silver iodide and potassium iodide
In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below :
- (a)1 only
- (b)1 and 2 only
- (c)2 and 3 only
- (d)1, 2 and 3
Show answerHide answer
Official answer(a) 1 only
Water can dissolve more substances than any other liquid because
- (a)it is dipolar in nature
- (b)it is a good conductor of heat
- (c)it has high value of specific heat
- (d)it is an oxide of hydrogen
Show answerHide answer
Official answer(a) it is dipolar in nature
In India, the use of carbofuran, methyl parathion, phorate and triazophos is viewed with apprehension. These chemicals are used as
- (a)pesticides in agriculture
- (b)preservatives in processed foods
- (c)fruit-ripening agents
- (d)moisturising agents in cosmetics
Show answerHide answer
Official answer(a) pesticides in agriculture
Which of the following is/are the example/examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.
- (a)1 and 2 only
- (b)3 only
- (c)1, 2 and 3
- (d)None
Show answerHide answer
Official answer(b) 3 only
Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to
- (a)The formation of hydrochloric acid when chlorine is added to water
- (b)The formation of hypochlorous acid when chlorine is added to water
- (c)The formation of nascent oxygen when chlorine is added to water
- (d)The formation of hydrogen when chlorine is added to water
Show answerHide answer
Official answer(b) The formation of hypochlorous acid when chlorine is added to water