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Q:

Aqueous solution of copper sulphate?

A) does not affects litmus B) affects both red and blue litmus
C) turns blue litmus red D) turns red litmus blue
 
Answer & Explanation Answer: C) turns blue litmus red

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Q:

Which of the following elements has the lowest melting point?

A) Iron B) Nitrogen
C) Iodine D) Lead
 
Answer & Explanation Answer: B) Nitrogen

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Q:

Ozone is represented as _____.

A) O3 B) H2O2
C) Cl2O D) N2O
 
Answer & Explanation Answer: A) O3

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Q:

What is the name of the process where gas is directly converted to solids called?

A) Sublimation B) Deposition
C) Condensation D) Evaporation
 
Answer & Explanation Answer: B) Deposition

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Q:

A) Mineral B) Tribe
C) Grass D) Town
 
Answer & Explanation Answer: C) Grass

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Q:

Matter is classified as a

A) pure substance B) mixture
C) both 1 & 2 D) none of the above
 
Answer & Explanation Answer: C) both 1 & 2

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Q:

Atomic number of which of the following elements is greater than that of Neon?

A) Oxygen B) Magnesium
C) Nitrogen D) Boron
 
Answer & Explanation Answer: B) Magnesium

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Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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