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Q:

Which of the following elements has a total of 3 shells with 8 electrons in the last orbit?

A) Ar B) P
C) S D) Al
 
Answer & Explanation Answer: A) Ar

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Q:

Why do atoms bond?

A) To reduce potential energy and gain stability B) To make atoms
C) To increase potential energy and lose stability D) To increase potential energy and gain stability
 
Answer & Explanation Answer: A) To reduce potential energy and gain stability

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Q:

Atomic numbers of four elements are as follows : F(9), P(15), Cl(17), Ar(18). Which of the following two elements would be chemically similar?

A) F and Ar B) Cl and P
C) F and P D) F and Cl
 
Answer & Explanation Answer: D) F and Cl

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Q:

Which of the following gases is liberated when Sodium Hydrogen Carbonate is heated?

A) Carbon Monoxide B) Carbon Dioxide
C) Oxygen D) Hydrogen
 
Answer & Explanation Answer: B) Carbon Dioxide

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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:

Which of the following is not a greenhouse gas?

A) Carbon dioxide B) Methane
C) Chlorofluorocarbons D) Oxygen
 
Answer & Explanation Answer: D) Oxygen

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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:

The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.

A) 7 B) 5
C) 4 D) 6
 
Answer & Explanation Answer: B) 5

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