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Standard XII

Chemistry

SHE

If Cu react...

Question

If $C u$ reacts with conc. $H_{2} S O_{4}$ , then what reactions take place:

C u

is oxidised to

C u^{2 +}

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S O_{4}^{2 -}

is reduced to

S O_{2}

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Both of the above reactions take place

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None of the above reaction take place

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Solution

The correct option is D Both of the above reactions take place
Reaction:
$C u + H_{2} S O_{4} \to C u S O_{4} + S O_{2} + H_{2} O$

In the above reaction $C u$ is oxidised to $C u^{2 +}$ and $S O_{4}^{2 -}$ is reduced to $S O_{2}$ .
Hence both of the reaction takes place.

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Similar questions

Q. Dehydration of alcohols by conc.

H_{2} S O_{4}

takes place according to following steps.

The slowest and fastest steps in the above reaction are:

$M n O_{2} + 4 H C l \to M n C l_{2} + 2 H_{2} O + C l_{2}$

In the above reaction, Mn is reduced and Cl is oxidised. The reactions in which both oxidation and reduction takes place is called __________ reaction.

Q. What takes place when zinc metal is added to an aqueous solution containing magnesium nitrate and silver nitrate?

1. Z n

is oxidised

2. M g^{2 +}

is reduced

3. A g^{+}

is reduced

4.

No reaction takes place

C u + H N O_{3} ⟶ C u^{2 +} + N O_{2} (g) + H_{2} O

Z n + H^{+} + N O_{3}^{-} ⟶ N H_{4}^{+} + Z n^{2 +} + H_{2} O

The above reaction takes place when

1.5

g of brass containing

C u

and

Z n

reacts with

3 M H N O_{3}

solution. The liberated

N O_{2}

(g) was found to be

1.04

litres at

25^{\circ} C

and one atm pressure. Calculate the

%

composition of brass.

H_{2} S O_{4} ⟶ H^{+} + H S O_{4}^{-}

(100% ionisation)

H S O_{4}^{-} ⟶ H^{+} + S O_{4}^{2 -}

(10% ionisation)

The given reaction takes place when sulphuric acid dissolves in water.

If we start with

0.2 M

aqueous solution of

H_{2} S O_{4}

then

[S O_{4}^{2 -}]

in the above case will be:

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If Cu reacts with conc. H2SO4, then what reactions take place:

The correct option is D Both of the above reactions take placeReaction:Cu+H2SO4→CuSO4+SO2+H2OIn the above reaction Cu is oxidised to Cu2+ and SO2−4 is reduced to SO2.Hence both of the reaction takes place.

If $C u$ reacts with conc. $H_{2} S O_{4}$ , then what reactions take place:

The correct option is D Both of the above reactions take place
Reaction:
$C u + H_{2} S O_{4} \to C u S O_{4} + S O_{2} + H_{2} O$

In the above reaction $C u$ is oxidised to $C u^{2 +}$ and $S O_{4}^{2 -}$ is reduced to $S O_{2}$ .
Hence both of the reaction takes place.