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 at the cathode, with (100/12)% current efficiency is (Al = 27).
1 Answers
Talk Doctor Online in Bissoy App
A mixture of `NaHCO_(3) and Na_(2)CO_(3)`, weighed 1.0235. The dissolved mixture was reached with excess of `Ba(OH)_(2)` to form 2.1028g `BaCO_(3)`, b
Let x g of `NaHCO_(3)` be present in the mixture? Mass of `Na_(2)CO_(3)` in the mixture=(1.025-x)g` Number of moles of `NaHCO_(3)=(x)/(84)` Number of moles of `Na_(2)CO_(3)`=(1.0235-x)/(106)` Number of moles of...
2 Answers 1 views
25mL of 0.15M Pb `(NO_(3))_(2)` reacts completely with 20 mL of `Al_(2)(SO_(3))_(2)`. The molar concentration of `Al_(2)(SO_(4))_(3)` will be: `3Pb(NO
Correct Answer - a `(M_(1)V_(1))/(n_(1))Pb(NO_(3))_(2)=(M_(2)V_(2))/(n_(2))Al_(2)(SO_(4))_(3)` `(0.15xx25)/(3)=(M_(2)xx20)/(1)` `M_(2)`=0.0625
2 Answers 1 views
An electric current of 100 ampere is passed through a moltan liquid of sodium chloride for 5 hours. Calculate the volume of chlorine gas liberated at
The reaction taking place at anode is : `underset(71.0 g)(2Cl^(-)) rarr underset((71.0 g),("1 mole"))(Cl_(2))+underset(2xx96500" coulomb")(2e^(-))` `Q=I xx t=100 xx 5xx 60xx 60` coulomb The amount of chlorine liberated by passing...
2 Answers 1 views
When a quantity of electricity is passed through `CuSO_(4)` solution, 0.16 g of copper gets deposited. If the same quantity of electricity is passed t
Correct Answer - B Number of equivalents of copper deposited `=0.16/32=0.005` Volume of `H_(2)` gas at STP `=11.2xx0.005` `=0.056` litre `=56 cm^(3)`
2 Answers 1 views
One g equivalent of Na metal is formed from electrolyis of fused NaCl. No of "mole" of Al from the fused `Na_(3)AlF_(6)` with the same current passed
Correct Answer - C `underset(1" mole")(Na^(+))+underset(1" faraday")(e^(-)to)Na(s)` `AP^(+)+underset(1" faraday")(3e^(-)to)Al(s)` No. of mole of `Al=(1)/(3)` mole
2 Answers 1 views
A current of 1.0 A was passed for 2 hr through a solution of cuprocyanide and 0.3745 g of copper was deposited on the cathode. Calculate the current e
Correct Answer - A m(theoretical)`=(63.5xx0.1xx7200)/(96500)=0.4738g` `therefore%` efficiency `=(0.3745)/(0.4738)xx100=79%`
2 Answers 1 views
A steady current is passed for 25minutes through a silver voltameter and ammeter in series and 0.059g of silver of deposited. The ammeter reads 0.3A.
Correct Answer - 0.33A
2 Answers 1 views
A current o f1.5 A is passed through a silver voltameter for 35 minutes .The mass of silver deposited during electrolysis is 3.528 g Calculate the ele
Correct Answer - 0.00112g/c
2 Answers 1 views
How many of the following compounds are possible products when chlorine is passed through hypo solution (i) S (ii) HCl (iii) `Na_(2)S` (iv) `Na_(2)SO_
Correct Answer - 3(i, ii and iv)
2 Answers 1 views
Machine A can produce 6 items per hour and machine B can produce 11 items per hours. If machine A works for x hours and B works for y hours in a day a
Correct Answer - `6x + 11y le 200`
2 Answers 1 views