Batteries

Q. In a dry cell, the cathode is made of carbon electrodes and mangnese ions are reduced here:
$M{n}^{4+}+e^{-}\to M{n}^{3+}$.

1. True
2. False

Q. Consider the following statements about cathode rays
(a) These rays start from cathode and move towards anode
(b) Television picture tubes are cathode ray tubes
(c) Characteristics of cathode rays depend upon the material of electrodes used
The correct statements are

1. (a) & (c) only
2. (a), (b) & (c)
3. (b) & (c) only
4. (a) & (b) only

Q. Statement 1: Primary cell can be recharged by passing an electric current through them.
Statement 2: Secondary cells are those in which the energy produced from the combustion of fuels is directly converted into electrical energy.

1. Statement 1 is True, Statement 2 is False
2. Statement 2 is True, Statement 1 is False
3. Both the statements are True
4. Both the statements are false

Q. In a lead storage battery, multiple electrochemical cells are connected in series to get the maxiumum output.

1. True
2. False

Q. Why molten ionic compound conduct electric current? Explain with help of any electrolyte.

Q. In the conversion of $B{r}_2\to Br{O}_3^{-},$ the oxidation state of bromine changes from

1. 0 to –5
2. 0 to +5
3. 0 to –1
4. –1 to –1

Q. Dry cell has a small life time because of the corrosion of Zn container to form .

1. $N{H}_4^{+}\left(aq\right)$
2. $C{l}^{-}ions$
3. $M{n}_2{O}_3\left(s\right)$
4. $\left[Zn\right(N{H}_3{)}_4]C{l}_2$

Q.

WHAT WAS THE EXPERIMENT CARRIED OUT BY MICHAEL FARADAY WHEN HE PASSED ELECTRICITY THROUGH THE SOLUTION OF AN ELECTROLYTE

Q. In a lead storage battery, $dil.H_{2}S{O}_4$ is used as an electrolyte and consumed during redox reactions. It can be refilled many times.

1. True
2. False

Q. Mercury cell gives a constant potential.

1. True
2. False