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Calcination

which of the ...

Question

which of the following reactions show evolution of gas.
a.2AgCl ---2Ag +Cl₂
b. Pb + CuCl_{2 ---}PbCl₂₊Cu
c.CuO + H₂--- Cu + H₂O
d.ZnO + C ---- Zn + CO

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Solution

In case a and d, evolution of gas occur. This is due to the formation of Chlorine and Carbon monoxide which are gases in nature.

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Similar questions

Q. Which among the following is(are) double displacement reaction(s)?
(i)

P b + C u C l_{2} \to P b C l_{2} + C u

N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4} + 2 N a C l

C + O_{2} \to C O_{2}

C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O

Q. Based on the following reactions, arrange the metals in increasing order of their reduction potentials.

Z n + C u^{2 +} \to Z n^{2 +} + C u

M g + Z n^{2 +} \to M g^{2 +} + Z n

C u + 2 A g^{+} \to C u^{2 +} + 2 A g

Q. Construct the cells in which the following reactions are taking place. Which of the electrodes shall act as anode (negative electrode) and which one as cathode (positive electrode)?
(a)

Z n + C u S O_{4} = Z n S O_{4} + C u

C u + 2 A g N O_{3} = C u (N O_{3})_{2} + 2 A g

Z n + H_{2} S O_{4} = Z n S O_{4} + H_{2}

F e + S n C l_{2} = F e C l_{2} + S n

Q. The reaction

F e \to F e^{2 +} + 2 e^{-} (+ 0.44

)

would occur spontaneously with which of the following?
I.

P b \to P b^{2 +} + 2 e^{-} (+ 0.13

)

C u \to C u^{2 +} + 2 e^{-} (- 0.34

)

2 A g^{+} + 2 e^{-} \to 2 A g^{0} (+ 0.80

)

Select the correct option among the following :

Q. Which of the following reactions will take place?
A. Mg + ZnSO₄ → MgSO₄ + Zn
B. Zn + CuCl₂ → ZnCl₂ + Cu
C. Cu + FeSO₄ → CuSO₄ + Fe
D. Fe + MgCl₂ → FeCl₂ + Mg

(a) C and D
(b) A and B
(c) A, B and C
(d) all the above

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