Home
Class 11
CHEMISTRY
Zinc(Zn) a silvbery metal is used to fro...

Zinc`(Zn)` a silvbery metal is used to from brass (with copper) and to plate iron to prevent corrosion. How many grams of `Zn` are there in `0.25 mol` of `Za`?

A

`16g`

B

`13g`

C

`15g`

D

`20g`

Text Solution

Verified by Experts

The correct Answer is:
A

Molar mass of `Zn` in `65.39g`.
`0.25 mol Za xx (65.39g zn)/(1 mol Zn) = 16g Zn`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    R SHARMA|Exercise Follow-up Test 15|3 Videos
  • SOME BASIC CONCEPTS OF CHEMISTRY

    R SHARMA|Exercise Follow-up Test 16|5 Videos
  • SOME BASIC CONCEPTS OF CHEMISTRY

    R SHARMA|Exercise Follow-up Test 13|5 Videos
  • REDOX REACTIONS

    R SHARMA|Exercise Archives|29 Videos
  • STATES OF MATTER

    R SHARMA|Exercise ARCHIVES|41 Videos

Similar Questions

Explore conceptually related problems

How many atoms of copper are present in 0.35 mol of pure copper metal ?

40 mL of 0.125 M of NiSO_(4) solution is electrolysed by a current of 0.05 amp for 40 minutes. (i) Write the equation for the reactions occurring at each electrode. (ii) How many coulombs of electricity passed through the solution ? (iii) How many grams of the product deposited on the cathode ? (iv) How long will the same current have to pass through the solution to remove completely the metal ions from the solution ? (v) At the end of electrolysis how many grams of the product would appear at the anode ?

Knowledge Check

  • Beryllium occurs naturally in the form of beryl. The metal is produced from its ore by electrolysis after the ore has been converted to the oxide and then to the chloride.How many grams of Be(s) is deposited form a BeCl_2 solution by a current of 5.0 A that flows for 1.0 h? (Atomic weight:Be=9)

    A
    0.84
    B
    1.68
    C
    1.42
    D
    1.08
  • How many grams of methyl alcohol should be added to I 0 litre tank of water to prevent its freezing at 268 K ? (K _(f) for water is 1.86 K k g mol ^(-1))

    A
    `880.07g`
    B
    `899.04g`
    C
    `886.02g`
    D
    `868.06g`
  • Similar Questions

    Explore conceptually related problems

    Choose the correct option from the bracket and explain the statement giving reason. ( oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) To prevent rusting, a layer of ___ metal is applied on iron sheets.

    Choose the correct option from the bracket and explain the statement giving reason. ( oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) To prevent rusting, a layer of ___ metal is applied on iron sheets.

    In a silver plating system, an electrolysis current of 5.0 A is used for a certain time and 0.5 mol of silver is deposited. How many moles of copper and iron will be deposited in their respective plating system if an electrolysis current of 10.0 A is passed for twice the time for silver plating. ( Relative atomic mass of silver=107.3, of copper -63.54, of iron=55.85).

    Liquid ammonia is used in ice factory for making ice from water. If water at 20^(@)C is to be converted into 2 kg ice at 0^(@)C how many grams of ammonia are to be evaporated ?

    1.5 g of brass containing Cu and Zn reacts with 3 M HNO_(3) solution, the following reactions take place. Cu + HNO_(3) to Cu^(2+) + NO_(2)(g) + H_(2)O Zn + H^(+) + NO_(3)^(-) to NH_(4)^(+) + Zn^(2+) + H_(2)O The liberated NO_(2) (g) was found to be 1.04 L at 25^(@) C and one atm . (i) Calculate the percentage composition of brass. (ii) How many ml of 3 M HNO_(3) will be required for completely reacting 1 g of brass ?

    (a) Define the term molar conductivity . How is it related to conductivity of the related solution ? (b) One half-cell in a voltaic cell is constructed from a silver wire dipped in silver nitrate solution of unknown concentration . Its other half-cell consists of a zinc electrode dipping in 1.0 M solution of Zn(NO_(3))_(2) . A voltage of 1.48 V is measured for this cell . Use this information to calculate the concentration of silver nitrate solution used. (E_(Zn^(2+)|Zn)^(@) = -0.76V , E_(Ag^(+)|Ag)^(@) = + 0.80V ).