1099+ Important Chemistry MCQ Questions Answers

Q:

When combining with nonmetallic atoms, metallic atoms generally will

A) Lose electrons and forms cations	B) Gain electrons and forms anions
C) Lose electrons and forms anions	D) Gain electrons and forms cations

Answer & Explanation Answer: A) Lose electrons and forms cations

Explanation:

When combining with nonmetallic atoms, metallic atoms generally will Lose electrons and forms cations.

As the ionization energy of te metals are very low, so they can easily lose electrons and form positively charged ion called cations.

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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:

The alpha-particles are

A) high energy electrons	B) positively charged hydrogen irons
C) high energy x ray radiations	D) double positively charged helium nuclei

Answer & Explanation Answer: D) double positively charged helium nuclei

Explanation:

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6 4991

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:

Select the correct statement (s).

A) When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive.	B) When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative.
C) Both (A) and (B)	D) None of the above

Answer & Explanation Answer: C) Both (A) and (B)

Explanation:

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Q:

A yellow element that stinks when burned

A) Sulphur	B) Chlorine
C) Fluorine	D) Bromine

Answer & Explanation Answer: A) Sulphur

Explanation:

Sulphur is an yellow element that stinks when burned.

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Q:

Which ionization process requires the most energy?

A) C3+ (g) → C4+ (g) + e-	B) C (g) → C+ (g) + e-
C) C2+ (g) → C3+ (g) + e-	D) C+ (g) → C2+ (g) + e-

Answer & Explanation Answer: A) C3+ (g) → C4+ (g) + e-

Explanation:

We know that each successive IE is greater than the previous one, because each ionization process removes one electron and hence increases the total attractive force on the remaining electrons from the nucleus. Hence, C3+ (g) → C4+ (g) + e- needs more energy.

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Q:

The activity of rradioisotope change with

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

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