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Science - Chemistry

Read many objective multiple choice questions of Science - chemistry in English. Practise online thousands of questions related to Science - chemistry. You can check online answer and try mock tests for Science - chemistry Questions provided in English.

Assertion (A): In the periodic table of chemical elements, election affinity is always found to increase from top to bottom in a group.
Reason (R): In a group, the atomic radii generally increase from top to bottom. 

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Assertion (A):  Synthetic detergents can lather well in hard water.
Reason (R):  Synthetic detergents form soluble calcium and magnesium salts with hard water.

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  • OOPS, your answer is incorrect

Assertion (A): With the increase of temperature, the viscosity of glycerine increases.
Reason (R): Rise temperature increases kinetic energy of molecules.

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  • OOPS, your answer is incorrect

Assertion (A): A chemical reaction becomes faster at higher temperatures.
Reason (R): At higher temperatures, molecular motion becomes more rapid.

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  • OOPS, your answer is incorrect

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R): Ammonia can be liquified at ambient temperatures at low pressures. 

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  • OOPS, your answer is incorrect

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