Batteries

Q.

What is the sulphuric acid concentration of a fully charged battery electrolyte?

Q. An organic compound contains 20% carbon, 6.7% hydrogen, and 46.67% nitrogen. Its molecular weight was found to be 60. Find the molecular formula of the compound.

1. $C{H}_{2}N{O}_2$
2. $C{H}_4{N}_{2}O$
3. $C{H}_2{N}_2{O}_2$
4. $C{H}_3{N}_{2}O$

Q. The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds i

Q. What is the percentage composition of the elements in ammonia?
$(N=14,H=1)$

1. $N=82.35\%;H=17.65\%$
2. $N=83.35\%;H=16.65\%$
3. $N=81.35\%;H=18.65\%$
4. $N=80.35\%;H=19.65\%$

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.

From which terminal of battery are the electrons taken by the chemical reaction of the battery?

Q.

What are the Observations of cathode ray experiment

Q. what is secondary battery? write the mechanism of recharging of lead storage battery with the help of chemical reaction

Q. An organic compound contains carbon and hydrogen. Its elemental analysis gave $C-75\%$ and $H-25\%$. The empirical formula of the compound would be:

1. $C{H}_4$
2. $C{H}_3$
3. $C{H}_2$
4. $CH$

Q. Use of lithium metal as an electrode in high energy density batteries is due

1. lithium is quite reactive
2. lithium has the highest oxidation potential.
3. lithium does not corrode readily.
4. lithium is the lightest element.

Q. Use of lithium metal as an electrode in high energy density batteries is due

1. lithium is the lightest element.
2. lithium does not corrode readily.
3. lithium has the highest oxidation potential.
4. lithium is quite reactive

Q.

Power alcohol used in automobile fuel is

1. 100% alcohol

2. 95.5% alcohol

3. Ethanol and petrol

4. Ethanol and methanol

Q.

Anode rays are also called Canal rays because they pass through the holes of the anode.

1. True
2. False

Q.

The liquid used in the voltaic cell is :

1. dilute sulphuric acid

2. dilute nitric acid

3. dilute sodium hyrdoxide

4. none of the above

Q. An organic compound contains C, H and S the minimum molecular weight of the compound containing 10% sulphur is : (atomic weight of S=32 amu)

1. $400gmo{l}^{-1}$
2. $320gmo{l}^{-1}$
3. $520gmo{l}^{-1}$
4. $600gmo{l}^{-1}$

Q. Which of the following is correct regarding electrolytic cell?

1. A device that convert electrical energy into chemical energy
2. A device that convert chemical energy into electrical energy
3. A device that convert mechanical energy into electrical energy
4. A device that convert electrical energy into mechanical energy

Q. $A{l}_2{O}_3$ can be converted to Anhydrous $AlC{l}_3$ by heating

1. with NaCl in solid state.
2. A mixture of and carbon in dry gas
3. with gas
4. with HCl gas

Q. Write the chemistry of recharging lead storage battery highlighting all the materials that are evolved during recharging.

Q. Two oxides of a metal contain $27.6\%and30.0\%$ of oxygen, respectively. If the formula of the first is $M_3$$O_4$, the second oxide is.

1. $M_3$$O_5$
2. $M_3$$O_3$
3. $M_3$$O_2$
   
4. $M_2$$O_3$

Q.

Give chemical equation for both charging and diacharging of dry cell, mercury cell, lead storage battery, nickel cadmium celland furl cell?

Q.

1.615 g of anhydrous $ZnS{O}_4$ was places in moist air. After a few days, its mass was found to be 2.875g. The molecular formula for hydrated zinc sulphate is

1. $ZnS{O}_4.2H_{2}O$
2. $ZnS{O}_4.5H_{2}O$
3. $ZnS{O}_4.7H_{2}O$
4. $ZnS{O}_4.10H_{2}O$

Q. Find electric field due to a semi Circular ring of uniform charge density at its centre.

Q. A gaseous compound is composed of $85.7\%$ by mass carbon and $14.3\%$ by mass hydrogen. Its density is $2.5{\text{g L}}^{-1}$ and one mole of the gas occupies $44.8\text{L}$ of space at a particular temperature and pressure. Determine the molecular formula of the compound.

1. $C_2{H}_4$
2. $C_2{H}_2$
3. $C_4{H}_8$
4. $C_4{H}_{10}$

Q. Who invented the first true battery ?

1. Faraday
2. Ohm
3. Volta
4. Alva Edison

Q. Spacecraft like the satellites that circle the earth and are used in television transmission have electric batteries that supply power for various purposes. These batteries contain ion-exchange resins instead of a liquid electrolyte solution because:

1. of extreme cold conditions
2. of lack of oxygen
3. a high electric voltage is required
4. of zero gravity

Q. In a compound $C,H$ & $N$ are present in the ratio of $18:2:7$ by weight. The empirical formula of the compound is:

1. $C_2{H}_6{N}_2$
2. $C_3{H}_{4}N$
3. $C_2{H}_8{N}_2$
4. $C_9{H}_{12}{N}_3$

Q. During charging of lead storage battery:

1. Sulphuric acid is regenerated

2. $Pb{O}_2$ dissolves

3. Lead sulphate gets deposited over the lead electrode
4. Concentration of $H_{2}S{O}_4$ decreases

Q. A given sample of pure compound contains $9.81\text{g}$ of $Zn$, $1.8\times {10}^{23}$ atoms of chromium and 0.60 mol of oxygen atoms. What is the simplest formula?

1. $ZnC{r}_2{O}_7$
2. $ZnC{r}_2{O}_4$
3. $ZnCr{O}_4$
4. $ZnC{r}_2{O}_6$

Q. In hydrogen fuel cell the catalyst used is/are:

1. $Pt$
2. $Fe$
3. $Ag$
4. $Zn$

Q. A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 litre (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate molecular formula of gas.

1. $C_2{H}_4$
2. $C_4{H}_8$
3. $C_2{H}_2$
4. None of the above