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Chemistry MCQs for NEET — Practice Questions with Answers

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Which one is correct about CH₂ = CCl₂?

Both carbon are in +2 oxidation state.

Both carbon are in +- oxidation state.

Once carbon has +2 and other -2 oxidation state.

The average oxidation number of carbon is +1.

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Explanation

In the molecule CH2=CCl2, one carbon atom is in the +2 oxidation state due to the double bond, while the other carbon atom is in the -2 oxidation state due to the two chlorine atoms attached to it. The average oxidation state of carbon is zero.

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N₂H₄ + IO₃^- + 2H+ + Cl^- $\to$ ICl + N₂ + 3H₂O

The equivalent masses of N₂H₄and KIO₃ respectively are :-

8 and 35.6

8 and 87

8 and 53.5

16 and 53.5

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In which of the following compound oxidation state of Fe is zero:-

FeS

Fe₂O₃

FeSO₄

Fe(CO)₅

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Explanation

CO is neutral ligand, so oxid no of Fe is ZERO

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In the reaction

xBrO_3^- + yCr⁺³ + zH₂O $\to$ Br₂ + CrO_4^-2 + H⁺

the coefficients x,y,z are respectively ?

6, 10, 11

6, 10, 20

6, 8, 22

6, 10, 22

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Identify the substance acting as oxidant in the following reaction:

BaCl₂ + Na₂SO₄ $\to$ BaSO₄ + 2NaCl

BaCl₂

Na₂SO₄

NaCl

None of these

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Identify the substance acting as oxidant in the following reaction.

BaCl₂ + Na₂SO₄ $\to$ BaSO₄ + 2NaCl

BaCl₂

Na₂SO₄

NaCl

None of these

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A metallic oxide contains 40% oxygen then equivalent weight of metal is

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Explanation

Suppose, weight of metallic oxide is 100g.

So, weight of metal = 60g

Weight of oxygen = 40g

Equivalents of metal = Equivalent of oxygen

$\frac{60}{E_{M}} = \frac{40}{8}$

E_m = 12

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3Cl₂ + 6NaOH $\to$ 5NaCl + NaClO₃ + 3H₂O, the equivalent weight of NaOH will be

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Explanation

3Cl₂ + 6NaOH $\to$ 5NaCl + NaClO₃ + 3H₂O

Mole ratio. 1:2

nf ratio. 2x5/6 : 1x5/6

=5/3

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In the conversion, H₂SO₄ $\to$ H₂S₂O₈ which process occurs?

Oxidation

Reduction

Oxidation as well as reduction

Neither oxidation nor reduction

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Explanation

In the conversion, H₂SO₄ $\to$ H₂S₂O_8,oxygen atom is oxidized (-2 to -1).

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Oxidation number of carbon in CH₂Cl₂ is

-4

-2

zero

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