Under what vapour pressure of moisture in atmospheric conditions CuS O 4 - 5 H 2 O will be efflorescent if CuS O 4 - 5 H 2 O s - CuS O 4 - 3 H 2 O-2 H 2 O g - K p -62-73 mm 2

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Standard XII

Chemistry

Reaction Quotient

Under what va...

Question

Under what vapour pressure of moisture in atmospheric conditions $C u S O_{4} \cdot 5 H_{2} O$ will be efflorescent if
$C u S O_{4} \cdot 5 H_{2} O (s) ⇌ C u S O_{4} \cdot 3 H_{2} O + 2 H_{2} O (g); K_{p} = 62.73 {(m m)}^{2}$

3.66

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7.92

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15.84

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None of these

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Solution

The correct option is B $7.92$ mm
The reaction will proceed only when vapour pressure of moisture $(P_{H_{2} O}^{'} = \sqrt{K_{p}} = \sqrt{62.73} = 7.92 m m)$ in atmosphere is lesser than $7.92 m m$ .

Thus, if $P_{H_{2} O} < 7.92, C u S O_{4} \cdot 5 H_{2} O$ to show efflorescent nature.

Hence, option B is correct.

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Similar questions

If $C u S O_{4 (s)}$ . $5 H_{2} O_{(s)}$ $⇋$ $C u S o_{4}$ . $H_{2} O_{(s)}$ + $2 H_{2} O$ (g) $K_{p}$ = 1.0 x $10^{- 4}$ atm2 at $250^{\circ}$ . The efflorescent nature of CuSO4 . 5H2O can be noticed when vapour pressure of H2O in atmosphere is:

Q. Under what pressure conditions is

C u {S O}_{4} .5 H_{2} O

efflorescent at 25C? How good a drying agent is

C u {S O}_{4} .3 H_{2} O

at the same temperature? Given

C u {S O}_{4} .5 H_{2} O (s) ⇌ C u {S O}_{4} .3 H_{2} O (s) + 2 H_{2} O (v)

K_{P} = 1.086 \times 10^{- 4} {a t m}^{2}

at 25C. Vapour pressureof water at 25C is 23.8 mm of Hg.

Q. If

{C u S O}_{4} \cdot 5 H_{2} O (s) ⇌ {C u S O}_{4} \cdot {3 H}_{2} O (s) + {2 H}_{2} O (l) K_{p} = 1.086 \times 10^{- 4} {a t m}^{2} a t 25^{o} C

The efflorescent nature of

{C u S O}_{4} \cdot {5 H}_{2} O

can be noticed when vapour pressure of

H_{2} O

in atmosphere is:

Q. For the reaction

C u {S O}_{4} \cdot 5 H_{2} O_{(s)} ⇌ {C u S O}_{4} \cdot {3 H}_{2} O_{(s)} + {2 H}_{2} O_{(g)}

which one is correct representation :-
(1)

K_{p} = {(P_{(H_{2} O)})}^{2}

(2)

K_{c} = {(H_{2} O)}^{2}

(3)

K_{p} = K_{c} {(R T)}^{2}

(4) All

Q. In the reaction :-

C u S O_{4} \cdot 3 H_{2} O (s) ⇌ 2 C u S O_{4} \cdot H_{2} O (s) + 2 H_{2} O (v)

Dissociation pressure is

7 \times 10^{- 3}

atm at

25

and

Δ H = 2700 c a l

. If the dissociation pressure at

127

X \times 10^{- 3}

atm, then

100 X

is__________.

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Under what vapour pressure of moisture in atmospheric conditions CuSO4⋅5H2O will be efflorescent ifCuSO4⋅5H2O(s)⇌CuSO4⋅3H2O+2H2O(g);Kp=62.73(mm)2

The correct option is B 7.92 mmThe reaction will proceed only when vapour pressure of moisture (P′H2O=√Kp=√62.73=7.92mm) in atmosphere is lesser than 7.92mm. Thus, if PH2O<7.92,CuSO4⋅5H2O to show efflorescent nature.Hence, option B is correct.

Under what vapour pressure of moisture in atmospheric conditions $C u S O_{4} \cdot 5 H_{2} O$ will be efflorescent if
$C u S O_{4} \cdot 5 H_{2} O (s) ⇌ C u S O_{4} \cdot 3 H_{2} O + 2 H_{2} O (g); K_{p} = 62.73 {(m m)}^{2}$