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pH of Salts

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Question

From the formula listed below, choose one, in each case, corresponding to the salt having the given description:-

$A g C l, C u C O_{3}, C u S O_{4} .5 H_{2} O, K N O_{3}, N a C l, N a H S O_{4}, P b (N O_{3})_{2} . Z n C O_{3}, Z n C O_{4} .7 H_{2} O .$

(a) an acid salt.

(b) an insoluble chloride.

(c) on treating with concentrated sulphuric acid, this salt changes from blue to white.

(d) on heating, this salt changes from green to black.

(e) this salt given nitrogen dioxide on heating.

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Solution

(a) $N a H S O_{4}$
(b) $A g C l$
(c) $C u S O_{4} .5 H_{2} O$
(d) $C u C O_{3}$
(e) $P b (N O_{3})_{2}$

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Q. From the formulae listed below, choose, one, corresponding to the salt having the given description:
AgCl, CuCO₃, CuSO₄.5H₂O, KNO₃, NaCl, NaHSO₄, Pb(NO₃)₂, ZnCO₃, ZnSO₄.7H₂O. On heating this, salt changes from green to black.

Q. (a) Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain:
(i) Sodium sulphate
(ii) Copper sulphate
(iii) Iron (II) sulphate
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Dilute sulphuric acid

Copper
Iron
Sodium, Zinc

Copper carbonate
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(b) From the formulae listed below, choose one, in each case, corresponding to the salt having the given description:
AgCl, CuCO₃, CuSO₄·5H₂O, KNO₃, NaCl, NaHSO₄, Pb(NO₃)₂, ZnCO₃, ZnSO₄·7H₂O.
(i) An acid salt.
(ii) An insoluble chloride.
(iii) On treating with concentrated sulphuric acid, this salt changes from blue to white.
(iv) On heating this salt changes from green to black.
(v) This salt gives nitrogen dioxide on heating.

From the list of following salts choose the salt that most appropriately fits the descriptions given in the following:

[A g C l, M g C l_{2}, N a H S O_{4}, P b C O_{3}, Z n C O_{3}, K N O_{3}, C a (N O_{3})_{2}]

(i) A deliquescent salt.
(ii) An insoluble chloride
(iii) On heating, this salt gives a yellow residue when hot and white when cold.
(iv) On heating this salt, a brown coloured gas evolved.

Q. When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas(A) was evolved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas(A) changes into a colourless solid(B).
Why does gas(A) change to solid on cooling?

Identify the anion present in the salt on the basis of the reaction given below

When dilute sulphuric acid is added to salt solution, a gas is produced which turns acidified potassium dichromate solution from orange to green.

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