Electrochemistry Test

Result

Electrochemistry Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

Find the potential of a half-cell having reaction, $$Ag_{2}S+2e\rightarrow2Ag+S^{2-}$$ in a solution buffered
$$pH=3$$ and which is also saturated with $$0.1\ M\ H_{2}S$$. For $$H_{2}S:\ K_{1}=10^{-8}$$ and $$K_{2}=2\times 10^{-13},\ K_{sp}(Ag_{2}S)=2\times 10^{-48},\ E_{Ag,ag}^{o}=0.8$$

A
$$0.432\ V$$

B
$$1.658\ V$$

C
$$-0.245\ V$$

D
$$-0.144\ V$$

Solution
Question 2
1 / -0

Which of the following represent first law of Faraday?

A
$$E=mc^2$$

B
$$PV-nRT$$

C
$$E=hv$$

D
$$W=zct$$

Solution
Question 3
1 / -0

In $$Zn|Zn^{+2}|| Ag^+|Ag$$, how will cell potential be affected if KI is added to $$Ag^{+}$$ half cell?

A
$$E_{cell}$$ will increase

B
$$E_{cell}$$ will decrease

C
$$E_{cell}$$ will remain unaffected

D
$$E_{cell}$$ is first increase then decrease
Question 4
1 / -0

A : Electrochemical cell is based on redox reaction.
R : Electrochemical cell converts electrical energy into chemical energy.

A
Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

B
Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

C
Assertion is true statement but Reason is false.

D
Both Assertion and Reason are false statements.
Question 5
1 / -0

Which of the following substance has the lowest electric resistivity at room temperature?

A
Aluminium

B
Iron

C
Nichrome

D
Diamond
Question 6
1 / -0

The no. of electrons involved in the electro deposition of 63.5 g. of Cu from aq. $$ CuSO_4 $$ is :

A
$$ 6.0 \times 10^{21} $$

B
$$ 3.011 \times 10^{23} $$

C
$$ 12.04 \times 10^{23} $$

D
$$ 6.02 \times 10^{23} $$

Solution
Question 7
1 / -0

In the electrolysis of aqueous $$NaCl$$, what volume of $$Cl_2(g)$$ is produced in the time that it takes to liberate $$5.0$$ liter of $$H_2(g) ?$$ Assume that both gases are measured at STP.

A
$$5.0$$

B
$$2.50$$

C
$$7.50$$

D
$$10.0$$

Solution
Question 8
1 / -0

How many faradays of charge is transferred to produce 11.2 L of $$H_2$$ at STP in the reaction, in the reaction, $$ NaH +H_2O \rightarrow NaOH +H_ 2 \uparrow $$ ?

A
$$1$$

B
$$0.5$$

C
$$2$$

D
$$2.5$$

Solution
Question 9
1 / -0

2 ml ethanoic acid was taken in test tubes - A, B and C. 2 ml, 4 ml and 8 ml of water was added to the test tubes A, B and C respectively. Which test tube will show clear solution?

A
only A

B
only B

C
only A and B

D
all
Question 10
1 / -0

Deduce from the following $${E^ \circ }$$ value of half cells, What combination of half cells would result in cell with the largest potential?
i) $${A^{3 - }} \to {A^2} + {e^ - };{\rm{ }}{{\rm{E}}^ \circ } = 1.5V$$
ii) $${B^{2 + }} + {e^ - } \to {B^ + };{\rm{ }}{{\rm{E}}^ \circ } = - 2.1V$$
iii) $${C^{2 + }} + {e^ - } \to + {C^ + };{\rm{ }}{{\rm{E}}^ \circ } = + 0.5V$$
iv) $$D \to {D^{2 + }} + 2{e^ - };{\rm{ }}{{\rm{E}}^ \circ } = - 1.5V$$

A
(i) and (iii)

B
(i) and (iv)

C
(ii) and (iv)

D
(iii) and (iv)

Solution