Faraday's First Law

Q. assertion-reason (i) If both assertion and reason are true and reason is correct explanation of assertion. (ii) If both assertion and reason are true both reason is not the correct explanation of assertion. (iii) If assertion is true but reason is false (iv) If both assertion and reason are false. A: total carge on N_A ions of co_3^{2-} is 1.93 ×10^{5 }coulamb R:charge on one electron is 96500 coulamb

Q. The molcular weight of $O_2$ and $S{O}_2$ are $32$ and $64$ respectively. At ${15}^{\circ }C$ and $150mmHg$ pressure, one litre of $O_2$ contains ${}^{\prime }{N}^{\prime }$ molecules. The number of molecules if two litres of $S{O}_2$ under the same conditions of temperature and pressure will be ________.

1. $N$
2. $2N$
3. $4N$
4. $\frac{N}{2}$

Q. (D) 0.57 mL(c) 80 mLD. The total volume of 0.1 M KMnO4 solution that are needed to oxidize 100 mg each of ferrousOxalate and ferrous sulphate in a mixture in acidic medium is:(a) 1.096 mL(d) none of these(b) 1.32 mL(c) 5.48 mLVMn0solution.

Q.

Acidulated water is electrolysed by 1A current for 16 minutes and 5 seconds using inert electrodes. The volume of gases liberated at STP will be :

1. 224 ml

2. 112 ml

3. 168 ml

4. 336 ml

Q. 24 1 gm of a mixture of CaCO3 and MgCO3 is reacted with access dil. HCl. Thus produced CO2 whose volume is 240 ml in S.T.P. Calculate the conjugated percentage of the mixture.

Q. Why chlorine shows -I effect but not -M ?instead it shows +M efect and develops positive charge

Q. 52 What will be the volume of O gas at STP which is obtained by thermal decomposition of 30.62 g KClO , with 80% purity :- (1) 3.36 L (2) 6.72 L (3) 10.11 L (4) 1.68 L

Q. Why Metallic Hydrides are also known as Interstitial Hydride?

Q. A current of $10$ amperes flowing for 10 minutes, deposits $3g$ of metal. The equivalent weight of the metal is:

1. 21.5
2. 48.25
3. 18.5
4. 12.5

Q. The volume of 3M HNO3 required to oxidise 8g Fe2+ is

Q. 29. A mixture of N, and H2 is caused to react in aclosed container to form NH. The reaction ceasesbefore any of the reactant has been totallyconsumed. At this stage, 4 moles each of N2, H2and NH are present. Then the weight of N and Hpresent originally were respectively(1) 224 g and 16 g(3) 168 g and 16 g(2) 168 g and 20 g(4) 224 g and 20 g

Q. If 96500 coulombs of electricity liberates one gram equivalent of any substance, the time taken for a current of $0.15$ amperes to deposite $20mg$ of copper from a solution of copper sulphate is
Given:
(Equivalent weight of copper = 32 g)

1. $\text{4 minutes 2 secconds}$
2. $\text{3 minutes 20 secconds}$
3. $\text{5 minutes 50 secconds}$
4. $\text{6 minutes 42 secconds}$

Q. Volume of CO2 obtained at STP by the complete decomposition of 9.85 gm BaCO3 is

Q. 12. A METAL CRYSTALLISES IN FCC WITH EDGE LENGTH a THE CLOSEST APPROACH BTW 2 ATOMS IN A METALLIC CRYSTAL WILL BE a)1.414a b)a/1.414 c)2a d)2.828a

Q. An electric discharge ts passed through a mixture containing 50 cc of O2 and 50 cc H2, then volume of the gas formed (i) at room temperature (ii) at 110^°C will be (All measurements are made at same preassure and temperature) (a) (i)25 cc (ii) 50 cc (b) (i)50 cc (ii) 75 cc (c) (i) 25 cc (ii) 75 cc (d) (i)75 cc (ii) 75 cc

Q. 36. A mixture of 1.65 10power21 molecule of X and 1.85 10power21 molecule of Y weight 0.688g .T he mol . wt.of X is ( mol.wt.nof Y is 187

Q.

what is bose-einstein condenstate

Q. The amount of electricity required to deposit 0.9gof aluminum the electrode reaction is
$A{l}^{3+}+3e^{-}\to Al$
(atomic mass of Al = 27)

1. $9.65\times {10}^{3}C$
2. $1.93\times {10}^{4}C$
3. $9.65\times {10}^{4}C$
4. $4.34\times {10}^{5}C$

Q. In electrolytic refining of Cu, when 9.65 A of current is passed through an electrolytic cell for 30000 seconds to purify 100 g of an impure Cu metal at the cathode. What is % of impurity in the metal? (Atomic mass of Cu = 63.5 amu)

Q. During the electrolysis of molten sodium chloride, the time to produce 0.10 mol of chlorine gas using a current of 3 amperes is

1. 55 minutes
2. 110 minutes
3. 220 minutes
4. 330 minutes

Q.

Which of the following represents the first law of Faraday

[MP PMT 1991]

1. 

2. 

3. 

4. 

Q. Two Faraday of electricity is passed through a solution of $CuS{O}_4$. The mass of copper deposited at the cathode is (at. mass of Cu = 63.5 u)

1. 0 g
2. 63.5 g
3. 2 g
4. 127 g

Q.

Calculate the volume of hydrogen and nitrogen gas obtained by the decomposition of 100 litre of ammonia gas at STP

Q. When electricity is passed through a solution of $AlC{l}_3$, 13.5 g of Al is deposited. The number of Faradays (charge) must be:

1. 1
2. 1.5
3. 0.5
4. 2

Q. In electrolysis, if the duration of the passage of current is doubled, then the mass liberated is

1. Doubled
2. Increased
3. Halfed
4. Remains the same

Q. A current of $10$ amperes flowing for 10 minutes, deposits $3g$ of metal. The equivalent weight of the metal is:

1. 18.5
2. 12.5
3. 48.25
4. 21.5

Q. can weight deposited by equivalent weight give us no. of moles? (question from faradays law) as there is a question which says: How many atoms of calcium will be deposited from a solution of CaCl2 by a current of 25 milliamperes flowing for 60 seconds

Q.

What is the mass of silver deposited on the passage of 2 A current during the electrolysis of silver?
Electrochemical equivalent of silver = $1.18\times {10}^{-3}gm{C}^{-1}$

1. $2.28\times {10}^{-3}gm$
2. $2.36\times {10}^{-3}gm$
3. $2\times {10}^{-3}gm$
4. $Cannotbedetermined$

Q.

One Faraday is:

1. the charge on a mole of protons

2. unit charge times Avogadro’s constant

3. neither a nor b

4. both a and b

Q. Two beakers that have the same solution have different masses of metals deposited on their electrodes when the current passed .

1. is the same
2. is different
3. is zero