A current of 9.95 amp following for 10 minutes, deposits 3 gm of a metal. Equivalent weight of the metal is:
A. 12.5
B. 18.5
C. 21.5
D. 48.5
1 Answers
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In every 45 minutes, the number of nuclei of a radionuclides becomes 80 % of its number before 45 minutes, then the time (in minute) in which the numb
Correct Answer - C Radioactive disintegration follow `I^(st)` order kinetics `lambda =(l)/(t) ln .(N_(0))/(N_(t)) " " (1)/(45) ln .(100)/(80) =(1)/(t) ln (100)/(64)` `t=45 ((2 ln 10 -6 ln 2)/(ln 10 -3...
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A cell Ag|`Ag^+||Cu^(++)|Cu` initially contains `2M Ag^+` and `2M Cu^(++)` ions. The change in cell potential after the passage of 10 amp current for
Correct Answer - A Q=10x4825 =48250 C no. of mole of `Ag^+ =48250/96500=0.5` `Ag+1/2 Cu^(++)toAg^+ +1/2 Cu` `{:(2.00,2.00),(2-0.25,2+0.50):}` `E_"cell"=E_"cell"^@-0.0591/1 "log" ([Ag^+])/([Cu^(++)]^(1//2)) implies E_1=E_"cell"^@-0.0591/1"log"2.00/((2.00)^1//2)` `E_2=E_"cell"^@-0.0591/1 "log" (2.50)/(1.75)^((1//2)) implies DeltaE=E_2-E_1=0.0591/1["log"sqrt2-"log"2.50/sqrt(1.75)]` `=0.0591/1["log"1.41-"log"1.88]=0.0591/1[0.1492-0.2742]=-0.0591/2xx0.125=-0074 V`
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An experiment takes `10` minutes to raise the temperature of water in a container from `0^(@)C "to" 100^(@)C` and another `55` minutes to convert it t
Correct Answer - D Let M is mass of water and P is amount of heat supplied per unit minute. `MS_(W)(100-0) = P xx 10 …..(i)` `ML_(V) = P xx 55...
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An electric current of 1 amp is passed through acidulated water for 160 minutes and 50 seconds. What is the volume of the hydrogen liberated at the an
Correct Answer - A `V = (l tV_(e))/(96500)` `= (1 xx 9650 xx 11.2)/(96500) = 1.12 "litre"`
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Catalytic decomposition of nitrous oxide by gold at `900^(@)C` at an initial pressure of 200mm was `50%` in 53 minutes and `73%` in 100 minutes. (a) W
(a) Using first order kintetic equation and substituting given values In first case: `k=(2.303)/(53)log_(10).(200)/(200-100)=0.0131"min"^(-1)` In second case `k=(2.303)/(100)log_(10).(200)/(200-146)=0.0131"min"^(-1)` As the values of k come out to be the same in...
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In an ac circuit the instantaneous values of current and applied voltage are respectively `i=2(Amp) sin (250pis^(-1)t and epsi =(10V) sin [(250pis^(-1
Correct Answer - `10 W, 5W` `P=iepsilon=[2 sin250pit][10sin(250pit+pi//3)]` at `t=2/3xx10^(-3)rArr P=10 watt` `ltPgt = i_(rms)epsilon_(rms)cos phi=2/sqrt2xx10sqrt2xxcos pi//3` `P=iepsilon=[2sin 250pi t][10 sin (250pit+pi//3)] , t=2/3 xx10^(-3) rArr P=10` watt `ltPgt = i_(rms)epsilon_(rms)cos...
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A direct current deposits deposits 54 g of silver (Atomic mass = 108) during electrolysis. How much aluminimum (Atomic mass =27) would be deposited fr
Correct Answer - A Equivalent mass of silver = 108 Equivalent mass of aluminium in `(AlCl_(3))=27/3 =9` `W_(Ag)/W_(Al)=E_(Ag)/E_(Al)` `54/W_(Al)=108/9` `W_(Al)=4.5 g`
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Equal weight of X (atomic weight = 36) and Y(atomic weight = 24) are reacted to form compound `X_(3)Y_(5)`, which of the following is/are correct?
Correct Answer - B::D `{:(,3X,+,5YrarrX_(3)Y_(5),,),("Mass","ag",,"ag",,),("Mole",(a)/(36),,(a)/(24),,),("Mole",(a)/(36)xx(1)/(3),,(a)/(24)xx(1)/(5),"Y is the limiting reagent",):}` `therefore " Mass of "X_(3)Y_(5)=(1)/(5)xx((a)/(24))(36xx3+5xx24)=1.9a`
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A current of 0.5 amp is passed through excess of molten mixture of `Al_(2)O_(3)` and `Na_(3)AlF_(6)` for 9.65 hours. The mass of Al (in mg) deposited
Correct Answer - 1350
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The Bank accepts two types of deposits from the public i.e. Demand and Time Deposits.
The basic aim of the bank is to pool the excess money to the bank and develop the habit of saving amount people. Bank accepts deposits in two forms i.e. Demand...
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