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The normality of 4% (mass/Vol.) NaOH is:

0.1

1.0

0.05

0.01

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Explanation

(b) N = 4x1000/40x100 = 1.0

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A compound contains atoms of three elements A,B and C. If the oxidation number of A is +2, Bis +5 and that of C is -2, the possible formula of the compound is

A₂(BC₃)₂

A₃(BC₄)₂

A₃(B₄C)₂

ABC₂

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Explanation

(b) In A₃(BC₄)₂

3 X oxidation number of A + 2[oxidation number of B + 4 X oxidation number of C] = 0

3 X (+2) + 2[5+4X(-2)] =0

6+2[-3] = 0

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The number of peroxide linkages in CrO₅ is /are

one

two

three

none

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Conversion of PbSO₄ to Pbs is:

reduction of S

oxidation of S

dissociation

none of these

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Explanation

(a) Sulphur gets reduced from +6 to -2.

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Aqueous solution of SO₂ reacts with H₂S to precipitate sulphur. Here SO₂ acts as:

catalyst

reducing agent

oxidising agent

acid

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Explanation

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Which of the following is a redox reaction?

NaCl + KNO₃ $\to$ NaNO₃ + KCl

CaC₂O₄ + 2HCl $\to$ CaCl₂ + H₂C₂O₄

Mg(OH)₂ + 2NH₄Cl $\to$ MgCl₂ + 2NH₄OH

Zn + 2AgCN $\to$ 2Ag + Zn(CN)₂

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Explanation

(d) Zn is oxidised and Ag is reduced.

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In which of the following reaction,reduction of hydrogen takes place ?

Carbon Monoxide + Copper Oxide $\to$ Carbon Dioxide + Copper

Copper Oxide + Hydrochlorid Acid $\to$ Water + Copper Chloride

Steam + Iron $\to$ Hydrogen + Iron oxide

Hydrogen+ Iron Oxide $\to$ Water + Iron

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Explanation

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Oxidation number of Fe in K₃[Fe(CN)₆] is:

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Explanation

(b) 3 x 1 + a + 6 x (-1) = 0

∴a = +3

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It is found that v forms a double salt isomorphous with Mohr's salt. The oxidation number of V in this compound is:

-4

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Explanation

(b) VSO₄ is isomorphous to,FeSO₄.(NH₄)₂SO₄.6H₂O.

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The correct order of reducing power of halide ions is:

Cl^- > Br^- > I^- > F^-

Cl^- > I^- > Br^- > F^-

Br^-> Cl^- > I^- > F^-

I^- > Br^-> Cl^- > F^-

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Explanation

(d) Due to higher $E_{OP}^{°}$ order.

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