Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?

5 years ago

A. CH4 B. C2H6 C. C3H6 D. C3H8 E. C6H6 Correct Answer: Option C - C3H6

Which method is used for the purification of copper from its ore?

5 years ago

A. distillation B. electrochemical C. electrolysis D. neutralization E. reduction Correct Answer:  Option C - electrolysis

How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]

5 years ago

A. 0.1 B. 0.3 C. 1 D. 2.7 E. 3 Correct Answer: Option C = 1

Which metal bromide is widely used in photography?

5 years ago

A. calcium bromide B. magnesium bromide C. potassium bromide D. silver bromide E. sodium bromide Correct Answer: Option D -…

What change will occur during the electrolysis of brine using carbon electrodes?

5 years ago

A. Chlorine will be given off at the cathode B. Oxygen gas will be given off at the anode C.…

Which metal is a constituent of both bronze and solder?

5 years ago

A. copper B. lead C. silver D. tin E. zinc Correct Answer: Option D - tin

An atom of element X has an electronic configuration of 1s²2p³3s²3p². In which group of the periodic table is X?

5 years ago

A. 0 B. 2 C. 3 D. 4 E. 5 Correct Answer: Option D - 5

What mass of silver is deposited when a current of 2.6A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]

5 years ago

A. 6.89g B. 6.93g C. 6.98g D. 7.04g E. 7.12g Correct Answer: Option C - 7.04g

Why does the treatment of cotton fabrics with dilute acids weaken the materials?

5 years ago

A. Cotton is hydrolyzed completely to glucose B. The fabrics are soluble in dilute acids C. The molecular chains are…

An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.

5 years ago

What is the empirical formula of the compound? [C = 12, H = 1, Br = 80] A. CH3Br B.…

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