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 Chemistry Questions

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Q:

What is the valency of magnesium?

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

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Q:

____ is the process in which acids and bases react to form salts and water.

A) Distillation B) Electrolysis
C) Neutralisation D) Hydrolysis
 
Answer & Explanation Answer: C) Neutralisation

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Q:

How are elements arranged in the Modern Periodic Table?

A) In the increasing order of their Molecular Mass B) In the increasing order of their Atomic Mass
C) In the increasing order of their Atomic Number D) In the increasing order of their Mass Number
 
Answer & Explanation Answer: B) In the increasing order of their Atomic Mass

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Q:

Which of the following solutions is the most acidic among them all?

A) Solution with pH value 0 B) Solution with pH value 6
C) Solution with pH value 1 D) Solution with pH value 7
 
Answer & Explanation Answer: A) Solution with pH value 0

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Q:

If a solution turns blue litmus red, its pH is likely to be

A) 7 B) 8
C) 9 D) 6
 
Answer & Explanation Answer: D) 6

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Q:

Identify a use of the isotope of uranium.

A) Fuel in nuclear reactors B) Treatment of goitre
C) Treatment of cancer D) Fuel in aeroplanes
 
Answer & Explanation Answer: A) Fuel in nuclear reactors

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Q:

Isobars have _______.

A) Same mass numbers but different atomic numbers B) Different mass numbers but same atomic numbers
C) Same mass and atomic numbers D) Different mass and atomic numbers
 
Answer & Explanation Answer: A) Same mass numbers but different atomic numbers

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Q:

Atomic mass of Carbon is 12 and that of Helium is 4. State which of the following statements is true for 1 mole of each of the elments?

A) 1 mole of Helium will contain 3 times more atoms than 1 mole of Carbon B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium
C) 1 mole of Carbon will contain one-third the number of atoms present in 1 mole of Helium D) 1 mole of Carbon will contain 3 times more atoms than 1 mole of Helium
 
Answer & Explanation Answer: B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium

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