1099+ Important Chemistry MCQ Questions Answers

Q:

What is formed when helium atom loses one electron?

A) Proton	B) Positive helium ion
C) Negative helium ion	D) Alpha particle

Answer & Explanation Answer: B) Positive helium ion

Explanation:

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Q:

The number of neutrons in dipositive Zinc ion is

A) 34	B) 36
C) 38	D) 40

Answer & Explanation Answer: D) 40

Explanation:

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Q:

What is the systematic name of PbO?

A) Plumbic oxide	B) Lead oxide
C) Lead(II) oxide	D) All of the above

Answer & Explanation Answer: C) Lead(II) oxide

Explanation:

The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name.

PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.

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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:

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:

The activity of rradioisotope change with

A) temperature	B) pressure
C) chemical environment	D) None of these

Answer & Explanation Answer: D) None of these

Explanation:

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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:

Which acid is present in tomato?

A) Sulphuric acid	B) HCl
C) Both A & B	D) Citric acid

Answer & Explanation Answer: D) Citric acid

Explanation:

which_acid_is_present_in_tomato1542371895.jpg image

Citric acid is present in tomatoes.

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