1099+ Important Chemistry MCQ Questions Answers

Q:

Leakage of which of the following gases caused the Bhopal gas tragedy ?

A) Carbon monoxide	B) Methyl isocyanate
C) Nitrous oxide	D) Hydrogen sulphide

Answer & Explanation Answer: B) Methyl isocyanate

Explanation:

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Q:

A by product of involuntary muscle contraction and relaxation is

A) Oxygen	B) Water
C) Heat	D) Nitrogen

Answer & Explanation Answer: C) Heat

Explanation:

A_by_product_of_involuntary_muscle_contraction_and_relaxation_is1537166589.jpg image

When a muscle is contracted and relaxed some amount of heat is released as a by product.

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Q:

Dry distillation of calcium formate gives

A) HCOOH	B) CH3COOH
C) HCHO	D) CH3CHO

Answer & Explanation Answer: C) HCHO

Explanation:

Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.

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Q:

Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

A) Chloroform	B) 2, 2, 2-Trichloroethanol
C) Trichloromethanol	D) 2, 2, 2-Trichloropropanol

Answer & Explanation Answer: B) 2, 2, 2-Trichloroethanol

Explanation:

$\begin{matrix} C l \\ | \\ C l & - & C & - & C H O \\ | \\ C l \end{matrix}$ $\to_{C a n n i z z a r o' s R e a c t i o n}^{N a O H}$ $\begin{matrix} C l \\ | \\ C l & - & C & - & C O O N a \\ | \\ C l \end{matrix}$ $+$ $\begin{matrix} C l \\ | \\ C l & - & C & - & C H_{2} \\ | 2 & 1 \\ C l \end{matrix}$ $- O H$

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Q:

Oxidation Number of 'S' in $H_{2} S O_{4}$ ?

A) +6	B) +2
C) -6	D) -2

Answer & Explanation Answer: A) +6

Explanation:

In $H_{2} S O_{4}$ ,

Hydrogen has a charge of +2, with each hydrogen has +1.

Oxygen has a charge of -8, with each oxugen has -2.

Total charge = (2 - 8) = -6

Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

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Q:

According to the modern Periodic Law, the properties of elements are periodic functions of their

A) volency	B) atomic mass
C) number of neutrons	D) atomic number

Answer & Explanation Answer: D) atomic number

Explanation:

Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.

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Q:

A bond formed by the transfer of electrons betwwen atoms of the elements is called

A) ionic bond	B) covalent bond
C) co ordinate bond	D) none

Answer & Explanation Answer: A) ionic bond

Explanation:

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Q:

Group displacement law was given by

A) Bacquerel	B) Rutherford
C) Mendeleaf	D) Soddy and Fajan

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