MCQ
Which have melting point below $500\,^{\circ} C$.
- ✓$Zn ,\, Cd$
- B$Ag , \,Cu$
- C$Cd , \,Cu$
- D$Ag , \,Zn$
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$\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}$
$\text { rate }=\mathrm{k}[\mathrm{A}]^{1 / 2}[\mathrm{~B}]^{1 / 2}$
The reaction is initiated by taking $1 \mathrm{M}$ concentration $A$ and $B$ each. If the rate constant $(k)$ is $4.6 \times 10^{-2} \mathrm{~s}^{-1}$, then the time taken for $\mathrm{A}$ to become $0.1 \mathrm{M}$ is . . . . . . . . . . sec. (nearest integer)
The $E _{\text {ceil }}$ for the given cell is $0.1115\,V$ at $298\,K$ when $\frac{\left[ M ^{+}( aq )\right]}{\left[ M ^{3+}( aq )\right]}=10^{ a }$
The value of a is
Given : $E _{ M ^{3+} / M ^{+}}=0.2\,V$
$\frac{2.303 RT }{ F }=0.059\,V$
[At. nos. $Zn = 30, Sc = 21, $$Ti = 22, Cr = 24$]