Question
A solution Ni(NO3)2 is electrolysed between platinum electrodes a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?
✓
Answer
Amolunt of electricity flow
$Q = It$
I = 5 Ampere, 1 = time (in second) = 20 × 60s
$Q =5 \times 20 \times 60=6000 C$
The reaction taking place at cathode :
$Ni ^{2+}+2 e ^{-} \rightarrow Ni$
Atomic mass of Ni = 58.7 (1 mole)
According to the reaction, 2F or 2 × 96500 C of electric current is passed to get 58.7 g Ni.
Hence, the amount of Ni obtained by passing 6000 C eletric current :
$=\frac{58.7 \times 6000}{2 \times 96500}=1.824 g$
Therefore, the amount of Ni deposited at cathode = 1.824 g.
$Q = It$
I = 5 Ampere, 1 = time (in second) = 20 × 60s
$Q =5 \times 20 \times 60=6000 C$
The reaction taking place at cathode :
$Ni ^{2+}+2 e ^{-} \rightarrow Ni$
Atomic mass of Ni = 58.7 (1 mole)
According to the reaction, 2F or 2 × 96500 C of electric current is passed to get 58.7 g Ni.
Hence, the amount of Ni obtained by passing 6000 C eletric current :
$=\frac{58.7 \times 6000}{2 \times 96500}=1.824 g$
Therefore, the amount of Ni deposited at cathode = 1.824 g.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$3.9 g$ of benzoic acid dissolved in $49 g$ of benzene shows a depression in freezing point of $1.62 K.$ Calculate the van't Hoff factor and predict the nature of solute $($associated or dissociated$).$
$($Given: Molar mass of benzoic acid $= 122\ g\ mol^{-1}, K_f$ for benzene $= 4.9 K \ kg\ mol^{-1})$
→$($Given: Molar mass of benzoic acid $= 122\ g\ mol^{-1}, K_f$ for benzene $= 4.9 K \ kg\ mol^{-1})$
Why haloalkanes undergo nucleophilic substitution reaction whereas haloarenes undergo electrophilic substitution reaction, why?
- $\text{CH}_{3}-\text{CH}_{2}-\text{ Br}\xrightarrow{\text{AgCN } } ?$
What happens when D-glucose is treated with the following reagents?
(i) HI, (ii) Bromine water.
(i) HI, (ii) Bromine water.
Explain the acidic nature of alcohols and phenols by their reaction with metals. 'Alcohols and phenols are acidic in nature' verify the truth of this statement by a reaction with metals.
An antifreeze solution is prepared from $222.\ 6g$ of ethylene glycol $\ce{(C_2H_4(OH)_2)}$ and $200g$ of water. Calculate the molality of the solution. If the density of this solution be $1.072\ g\ mL^{-1},$ what will be the molarity of the solution?
→A first order reaction has a rate constant of $0.0051\ min^{–1}$. If we begin with $0.10 M$ concentration of the reactant, what concentration of the reactant will be left after $3$ hours?
→$Pt ( IV ), NH _3, Cl ^{-}$and $Na ^{+}$combine with each other to form seven types of complex compounds.
The following is :
$
\left[Pt\left(NH_3\right)_6\right] Cl_4
$
(i) Write the formulas of other six complex compounds.
(ii) Write the IUPAC names of these complex compounds.
(iii) Which of these complex aqueous solutions will have the highest conductivity?
(iv) Which of these complexes is non-ionic?
(v) Oxidation number of Pt in these complexes and also tell the coordination number.
→The following is :
$
\left[Pt\left(NH_3\right)_6\right] Cl_4
$
(i) Write the formulas of other six complex compounds.
(ii) Write the IUPAC names of these complex compounds.
(iii) Which of these complex aqueous solutions will have the highest conductivity?
(iv) Which of these complexes is non-ionic?
(v) Oxidation number of Pt in these complexes and also tell the coordination number.
How will you bring about the following conversions?
Methyl bromide to acetone.
Methyl bromide to acetone.
Explain the following reaction of $C _2 H _5 OH$ :
(a) Schotten Baumann reaction
(b) Reaction with concen. $HNO _3$
(c) Reaction with excess of $NH _3$
(d) Reduction with Red P and HI
→(a) Schotten Baumann reaction
(b) Reaction with concen. $HNO _3$
(c) Reaction with excess of $NH _3$
(d) Reduction with Red P and HI