1099+ Important Chemistry MCQ Questions Answers

Q:

What is the structure of IF7 ?

A) Triagonal bipyramid	B) Pentagonal bipyramid
C) Square pyramid	D) tetrahedral

Answer & Explanation Answer: B) Pentagonal bipyramid

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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Q:

Which of the following is a property of an acid?

A) Acids reacts with metals	B) Acids taste sour
C) Acids turn blue litmus paper red	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.

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Q:

Which of the following statements are CORRECT?

I. Melamine is a Thermo setting plastic.

II. It resists fire.

III It is a poor conductor of heat.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

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Q:

The activation energy for the reverse reaction is represented by

A) A	B) B
C) C	D) D

Answer & Explanation Answer: B) B

Explanation:

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Q:

Which of the following statement(s) is/are CORRECT?

I. Acids are sour in taste and generate H+ ions.

II. Acids are sour in taste and generate OH– ions.

III. Bases are bitter intaste and generate OH– ions.

A) Only I and III	B) Only I and II
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: A) Only I and III

Explanation:

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Q:

Which of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

Answer & Explanation Answer: B) A and B

Explanation:

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Q:

Which of the following statement(s) is/are CORRECT?

I. Bases are soapy to touch.

II. Bases generate OH– ions.

III. Metal oxides dissolve in water to form Acidic solution.

A) Only I and II	B) Only I and II
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: A) Only I and II

Explanation:

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Q:

An element with an atomic number of ___ will form a basic oxide.

A) 20	B) 7
C) 6	D) 17

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