1099+ Important Chemistry MCQ Questions Answers

Q:

Burning Magnesium ribbon produces white ash, which dissolves in water to form____.

A) Magnesium Halides	B) Magnesium Oxide
C) Magnesium Hydroxide	D) Magnesium Sulphate

Answer & Explanation Answer: C) Magnesium Hydroxide

Explanation:

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Q:

Which of the following reactions are exothermic?

$1) C + O_{2} \to {CO}_{2} 2) 2 Mg + O_{2} \to 2 MgO 3) {CuSO}_{4} + 5 H_{2} O \to {CuSO}_{4} . 5 H_{2} O 4) All the above$

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

Answer & Explanation Answer: D) 4

Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

Generally all the combining reactions are exothermic in nature.

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Q:

Which of the following group is NOT Dobereiner Triads?

A) Li, Na, K	B) N, P Au
C) Cl, Br, I	D) Ca, Sr, Ba

Answer & Explanation Answer: B) N, P Au

Explanation:

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Q:

In modern periodic table while going from top to bottom in a group ______.

A) size of an atom increases	B) size of an atom decreases
C) ionisation energy of an atom increases	D) size and ionisation energy of an atom increases

Answer & Explanation Answer: D) size and ionisation energy of an atom increases

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

Answer & Explanation Answer: A) 20

Explanation:

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Q:

$Mg + O_{2} = MgO$

Balance the above Chemical equation?

A) 2Mg + O2 ----> 2MgO	B) 2Mg + O ----> 2MgO
C) 2Mg + O ----> MgO2	D) 2Mg + O2 ----> MgO2

Answer & Explanation Answer: A) 2Mg + O2 ----> 2MgO

Explanation:

Given Equation is

$Mg + O_{2} \to MgO$

Balancing the Chemical Equation is nothing but Conservation of Matter. As Matter is Neither created nor Destroyed, it must be conserved.

Here we have 1 Mg and 2 O on the left side and 1 Mg and 1 O on the right side

To balance that, add 1 Mg on the left side so that it becomes 2 Mg and 2 O on the left side

i.e,

$2 Mg + O_{2} \to 2 MgO$

Here it has 2 Mg & 2 O on the left side and 2 Mg and 2 O on the right side and the Chemical equation is Balanced.

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Q:

What is the Iupac name for the compound shown below.

clbr1527920257.png image

A) 1-Bromo-3-chlorocyclohexene	B) 2-Bromo-6-chlorocyclohex-1-ene
C) 6-Bromo-2-chlorocyclohexene	D) 3-Bromo-1-chlorocyclohex-1-ene

Answer & Explanation Answer: D) 3-Bromo-1-chlorocyclohex-1-ene

Explanation:

In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).

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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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