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 Chemistry Questions

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Q:

Which of the following compounds has a double bond?

A) Acetylene B) Ethene
C) Ethane D) Methane
 
Answer & Explanation Answer: B) Ethene

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Q:

In the modern periodic table, which of the two periods contain 8 elements each?

A) 4 and 5 B) 3 and 4
C) 1 and 2 D) 2 and 3
 
Answer & Explanation Answer: D) 2 and 3

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Q:

Two or more elements combine to form a

A) atom B) valency
C) compound D) radical
 
Answer & Explanation Answer: C) compound

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Q:

What is the atomicity of Phosphorous?

A) Di-atomic B) Poly-atomic
C) Tetra-atomic D) Mono-atomic
 
Answer & Explanation Answer: C) Tetra-atomic

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Q:

Acid rain is caused by release of ___ and___ into the air.

A) Carbon dioxide and Carbon monoxide B) Sulphur dioxide and nitrogen oxides
C) Oxygen and Water vapour D) Nitrous oxide and Ozone
 
Answer & Explanation Answer: B) Sulphur dioxide and nitrogen oxides

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Q:

Common salt (NaCl) is made up of

A) a weak acid and a weak base B) a strong acid and a weak base
C) a weak acid and a strong base D) a strong acid and a strong base
 
Answer & Explanation Answer: D) a strong acid and a strong base

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Q:

Which of the following is NOT a property of acids?

A) Acids form salts with bases B) Acids have bitter taste
C) Acids have sour taste D) Acids turn blue litmus red
 
Answer & Explanation Answer: B) Acids have bitter taste

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Q:

In a water molecule, the ratio of mass of Hydrogen to the mass of Oxygen is always:

A) 8:1 B) 7:1
C) 1:7 D) 1:8
 
Answer & Explanation Answer: D) 1:8

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