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NEET NEET Questions — Free MCQ Practice

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Extraction of gold and silver involves leaching with CN^- ion. Silver is later recovered by

A.

liquation

B.

distillation

C.

zone refining

D.

displacement with Zn

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Explanation

(d) Extraction of gold and silver involves leaching with CN^-ion. Silver is later recovered by distillation of Zn.

In the metallurgy of silver or gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air to obtain the metal in solution as complex Film the complex, metal is obtained later by replacement.

In general,

4M(s)+ 8CN^-(aq)+ 2H₂O (aq) + O₂(g) $\to$ 4[M(CN)₂]^-(aq) + 4OH^-(aq)

2[M(CN)₂]^-(aq)+ Zn(s) $\to$ [Zn(CN)₄]^2-(aq) + 2M(s)

M = Ag or Au This method is known as Mac-Arthur Forest cyanide process.

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Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of

A.

Al₂O₃+ HF + NaAlF₄

B.

Al₂O₃ + CaF₂ + NaAlF₄

C.

Al₂O₃ + Na₃AlF₆ + CaF₂

D.

Al₂O₃ + KF +Na₃AlF₆

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Explanation

Alumina, Al₂O₃ , is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar (CaF₂) and cryolite (Na₃AlF₆), which lower its melting point and make it more conducting.

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Which one of the following is a mineral of iron?

A.

Malachite

B.

Cassiterite

C.

Pyrolusite

D.

Magnetite

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Explanation

(d)

Mineral Chemical composition
Malachite CuCO₃.Cu(OH)₂
Cassiterite SnO₂
Pyrolusite MnO₂
Magnetite Fe₃O₄

Thus, magnetite is a mineral of iron

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In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

A.

copper (1) sulphide (Cu₂S)

B.

sulphur dioxide (SO₂)

C.

iron sulphide (FeS)

D.

carbon monoxide (CO)

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Explanation

In the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to Cu₂O which reacts with the remaining Cu₂S (sulphide ore) to give copper metal.

Cu₂S + 2Cu₂O $\to$ 6Cu + SO₂ $↑$

In this process Cu₂S behaves as reducing agent.

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Which of the following elements is present as the impurity to the maximum extent in the pig iron?

A.

Carbon

B.

Silicon

C.

Phosphorus

D.

Manganese

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Explanation

Pig iron contains about 4% carbon (major impurity) and other impurities (S, P, Si, Mn) in trace amounts.

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Which of the following pairs of metals is purified by van Arkel method ?

A.

Zr and Ti

B.

Ag and Au

C.

Ni and Fe

D.

Ga and In

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Explanation

Zr and Ti are purified by van Arkel method.

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Consider the following reactions at $1000 ° C .$

$(I) Z n (s) + 1 / 2 O_{2} (g) \overset{∆}{\to} Z n O (g); ∆ G ° = - 360 k J m o l^{- 1} (I I) C (s) + 1 / 2 O_{2} (g) \overset{∆}{\to} C o (g); ∆ G ° = - 460 k J m o l^{- 1}$

and choose the correct statement at $1000 ° C .$

A.

ZnO is more stable than CO

B.

ZnO can be reduced to Zn by C

C.

ZnO and CO are formed at equal rate

D.

ZnO can not be reduced to Zn by C

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Explanation

(b) From given reactions, Free energy of the reaction : $Z n O (g) + C (s) \to_{1000 ° C}^{∆} Z n (g) + C O (g),$ is negative.

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Consider the following reactions:

$2 X S + 3 O_{2} \overset{∆}{\to} 2 X O + 2 S O_{2}$

$2 X O + X S \overset{∆}{\to} 3' X' + S O_{2}$

Then 'X' can not be:

A.

Oxidising agent

B.

Reducing agent

C.

Catalyst

D.

Flux

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Explanation

(c)Zn is extracted from its sulphide ore by roasting followed by carbon reduction

Hg, Pb and Cu are extracted by self reduction from their sulphide ores.

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Chromium is obtained by reducing concentrated chromite ore with :

A.

red hot coke

B.

gaseous hydrogen

C.

aluminium powder

D.

carbon monoxide

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Explanation

(c) Cr metal is commercially extracted by Al-reduction method .

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Which is not correctly matched:

A.

spieglesian : Mn+Fe+C

B.

Dow's sea water process : $C a {(O H)}_{2}$

C.

parke's process :Ag

D.

liquation spelter(Impure Zn

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Explanation

(d) From spelter pure zinc is obtained either by distillation or by electrolytic refining.

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