1099+ Important Chemistry MCQ Questions Answers

Q:

what is the chemical name of the compound

${Cu}_{2} {CO}_{3}$

A) copper (ii) carbonate	B) copper (iii) carbonate
C) copper (i) carbonate	D) copper carbonate

Answer & Explanation Answer: C) copper (i) carbonate

Explanation:

The chemical name of the compound

${Cu}_{2} {CO}_{3 is}$ Copper (i) carbonate and is also called as cuprous carbonate.

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Q:

Place these hydrocarbons in order of decreasing boiling point.

1. Paraffin

2. Octadecane

3. Hexane

4. Neohexane and

5. Ethane

A) Paraffin > Octadecane > Neohexane > Hexane > Ethane	B) Paraffin > Octadecane > Hexane > Neohexane > Ethane
C) Hexane > Paraffin > Octadecane > Neohexane > Ethane	D) None of the above

Answer & Explanation Answer: B) Paraffin > Octadecane > Hexane > Neohexane > Ethane

Explanation:

In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.

The decreasing order of boiling point of mention compounds is written as follows:

Paraffin > Octadecane > Hexane > Neohexane > Ethane

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Q:

Saturated carbon compounds can form which types of chain structures?

I. Straight chain

II. Branched chain

A) Only I	B) Only II
C) Neither I nor II	D) Both I and II

Answer & Explanation Answer: D) Both I and II

Explanation:

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Q:

Which of the following statements are CORRECT?

I. The soap molecules form structures called micelles.

II Soap micelles cannot scatter light.

III. Oily dirt gets collected in the center of the micelle.

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

Answer & Explanation Answer: B) Both I and III

Explanation:

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Q:

Match List -I with List -II and select the correct answer using the code given below the Lists :

List -I List-II

(Compound/Molecule) (Shape of Molecule)

A. CH3F 1. Trigonal planar

B. HCHO 2. Tetrahedral

C. HCN 3. Trigonal pyramidal

D. NH3 4. Linear

A) 2 4 1 3	B) 2 1 4 3
C) 3 4 1 2	D) 3 1 4 2

Answer & Explanation Answer: B) 2 1 4 3

Explanation:

HCHO: The carbon and and the oxygen are bonded through a double bond which counts as "one electron pair". Hence the molecule has three electron pairs and is trigonal planar.

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Q:

Which category of Hydrogen releases water vapour and a by product when burnt?

A) Green Hydrogen	B) Blue Hydrogen
C) Red Hydrogen	D) Black Hydrogen

Answer & Explanation Answer: A) Green Hydrogen

Explanation:

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Q:

Choose the pure substance from the list below.

A) Sugar	B) Lemonade
C) Air	D) Sea water

Answer & Explanation Answer: A) Sugar

Explanation:

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Q:

Which of the following solutions is alkaline?

A) H+ <1 × 10-7 Mol/l	B) H+ = 1 × 10-4 Mol/l
C) H+ = 1 × 10-7 Mol/l	D) H+ > 1 × 10-7 Mol/l

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