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:...?

(A) Carbon dioxide
(B) Hydrogen sulfide

(C) Nitrogen
(D) Oxygen

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Which of the following gases is most predominant in the Sun...?

(A) Helium
(B) Hydrogen

(C) Nitrogen
(D) Ozone

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

(A) Paint
(B) Aluminum

(C) Brass
(D) Gunpowder

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

(A) Na2CO3
(B) NaHCO3

(C) Na2CO3
(D) Na2CO3.10H2O

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

(A) Gypsum
(B) Mercury

(C) Limestone
(D) Granite

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What is the most abundant element in the universe...?

(A) Hydrogen
(B) Oxygen

(C) Sodium
(D) Copper

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How many neutrons in hydrogen:...?

(A) O
(B) 1

(C) 2
(D) 3

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Diamond is an allotropic form of:...?

(A) Germanium
(B) Carbon

(C) Silicon
(D) Sulphur

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Which gas is known as laughing gas...?

(A) Nitrous oxide N2O
(B) Nitrogen

(C) Methane
(D) None of these

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Vaccination was discovered by...?

(A) Galileo
(B) Edward Jenner

(C) Baird
(D) Roentgen

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