Brass gets discolored in air because of the presence of which of the following gases in air:...? Mcqs

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Brass gets discolored in air because of the presence of which of the following gases in air:...?

(i) Carbon dioxide
(ii) Hydrogen sulfide

(iii) Nitrogen
(iv) Oxygen

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What is the chemical formula of washing soda...?

(i) Na2CO3
(ii) NaHCO3

(iii) Na2CO3
(iv) Na2CO3.10H2O

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Which one of the following is a metal...?

(i) Gypsum
(ii) Mercury

(iii) Limestone
(iv) Granite

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Which is the first element in the periodic table...?

(i) Hydrogen
(ii) Helium

(iii) Nitrogen
(iv) Carbon

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Which of the following is the least polluted gas...?

(i) Carbon
(ii) Nitrogen

(iii) Chlorine
(iv) None of these

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Which is the first element depicted on the Periodic Table...?

(i) Hydrogen
(ii) Aluminum

(iii) Oxygen
(iv) Gold

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Which gas can be ventilated buildings accumulated in poorly...?

(i) Xenon
(ii) Hydrogen

(iii) Radon
(iv) Helium

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

(i) Chlorofluorocarbon
(ii) Nitrogen

(iii) Helium
(iv) Tetrafluoroethene

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James Chadwick is known for his discovery...?

(i) Proton
(ii) Neutron

(iii) Electron
(iv) None of these

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What is a mixture of potassium nitrate Charcoal and Sulphur called...?

(i) Paint
(ii) Aluminum

(iii) Brass
(iv) Gunpowder

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