Dry Cell

Q.

Give the construction and working of a lead accumulator along with the chemical reactions involved.

Q. In a dry cell (zinc-carbon battery), the ______ acts as an anode.

1. Steel container
2. Zinc container
3. Carbon container
4. Chromium container

Q.

What is a cell pointer?

Q. What is an electrolytic cell?

Q. In an electrolytic cell, anions of the electrolyte ___________.

1. move towards anode
2. move towards cathode
3. are not formed
4. do not move

Q. The negative terminal of a dry cell is made up of ______.

1. ammonium chloride
2. zinc metal
3. manganese dioxide
4. graphite rod

Q.

Differentiate between a electrochemical cell and a electrolytic cell. [5 MARKS]

Q.

What is the function of powdered carbon present in the electrolyte of a dry cell?

Q.

The electrolyte of simple voltaic cell is

1. $N{H}_{4}Cl$

2. $CuS{O}_4$

3. $P{b}_3{O}_4$

4. $dilute{H}_{2}S{O}_4$

Q. Draw a well labelled diagram of dry cell and explain its construction.

Q. Choose the statement(s) which are true for a dry cell.

1. Longer shell life
2. Not sensitive to orientation
3. Cannot produce large electric current
4. All of the above.

Q. The positive terminal of a dry cell is formed by:

1. zinc container
2. carbon rod
3. graphite rod
4. both A and B

Q.

In Leclanche cell, Zinc rod is placed in:

1. 10% NH${}_4$ Cl
2. 30% NH${}_4$ Cl
3. 20% NH${}_4$ Cl
4. 40% NH${}_4$ Cl

Q. Draw neat and labelled diagram of dry cell.

Q.

Write any two industrial applications of electrochemical reaction.

Q. In dry cell, what acts as negative electrode?

1. Graphite
2. Ammonium chloride
3. Zinc
4. Manganese dioxide

Q. Assertion :A dry cell cannot be recharged. Reason: The chemical reaction in a dry cell is reversible.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Write anode and cathode reactions that occur in dry cell. How does a dry cell differ from a mercury cell?

Q.

The secondary reactions which takes place in dry cell are:

1)$Mn{O}_2+N{H}_4^{+}+e^{-}\to MnO\left(OH\right)+N{H}_3$

2)$2N{H}_{4}Cl+2\left(O{H}^{-}\right)\to$ $2N{H}_3+2C{l}^{-}+2H_{2}O$

3) $Zn+2Mn{O}_2\to$ $\left[Zn\right(N{H}_3{)}_2]+2O{H}^{-}+2MnO(OH)$

4) $Z{n}^{2+}2N{H}_3+2C{l}^{-}\to$ $\left[Zn\right(N{H}_3{)}_2]C{l}_2\text{or}ZnC{l}_2.2N{H}_3$

Correct statements are:

1. 1, 2, 4
2. 1, 2, 3, 4
3. 2, 4
4. Only 4

Q. Explain the dry cell with diagram?

Q. What is packing efficiency in solid states?

Q. Which of the following is/are true about dry cell?

1. $Z{n}^{2+}$ ions are oxidized to zinc.
2. $Mn{O}_2$ reduces $H_2$
3. Zinc reacts with ammonia
4. The dry cell is used as source of power in flashlights, portable radios, tape recorders, clocks etc.

Q. In the symbol of an electric cell, the longer line represents the:

1. Electric current
2. Positive terminal
3. Negative terminal
4. Voltage

Q. Which of the following is/are true about dry cell?

1. Cathoce is zinc.
2. Anode is an inert graphite rod.
3. Electrolyte is moist paste of ammonium chloride and zinc chloride.
4. Starch is added to the paste make it thick so that it cannot be leaked out.

Q. Which colourless gas evolves, when $N{H}_{4}Cl$ reacts with zinc in a dry cell battery?

1. $N{H}_4$
2. $N_2$
3. $H_2$
4. $C{l}_2$

Q. In an electric circuit, the current flows from to terminal of the battery.

1. negative
2. positive
3. inner
4. outer

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.