Plants exhale at night time which gas...? Mcqs

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Plants exhale at night time which gas...?

(A) O2
(B) H20

(C) Co1
(D) CO2

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James Chadwick is known for his discovery...?

(A) Proton
(B) Neutron

(C) Electron
(D) None of these

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Nitrogen boils at a temperature of:...?

(A) -96 °C
(B) -196 °C

(C) -296 °C
(D) -310 °C

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When a gas turns into a liquid the process is called:...?

(A) Condensation
(B) Evaporation

(C) Deposition
(D) Sulimation

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A matter can exist in which of the following forms:...?

(A) Liquid
(B) Solid

(C) Gas
(D) All of these

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Which metal is found in liquid state at room temperature?...?

(A) Iron
(B) Zinc

(C) Aluminum
(D) Mercury

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The process by which a substance absorbs moisture upon exposure to atmosphere is called:...?

(A) Deliquescence
(B) Efflorescence

(C) Dehydrogenation
(D) Desalination

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Which is the heaviest metal:...?

(A) Iron
(B) Mercury

(C) Nickel
(D) Platinum

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Which gas is used in refrigerators for cooling...?

(A) Chlorofluorocarbon
(B) Nitrogen

(C) Helium
(D) Tetrafluoroethene

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Which gas is filled in electric bulb...?

(A) Nitrogen
(B) Oxygen

(C) Carbon dioxide
(D) None of these

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