When a small piece of zinc metal is added to a solution of copper sulphate and on heating the products formed are ………………
A) CuO
B) ZnSO4 + Cu
C) ZnO
D) H2↑
1 Answers
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A piece of zinc weighing 0.635 g when treated with excess of dilute H2SO4 liberated 200 cm^3 hydrogen at STP.
Given : Mass of zinc = 0.635 g, Volume of H2 liberated = 200 cm3 To find : % purity of zinc sample Calculation : The relevant balanced chemical equation is, Zn + H2SO4 → ZnSO4 +...
2 Answers 5 views
If you touch a piece of wood and a piece of metal which were kept in the fridge for the same period of time then the result is
A) metal piece is colder than wooden piece
2 Answers 1 views
On adding a piece of aluminium foil to blue coloured copper sulphate solution, copper will be deposited on aluminium foil. Then the solution
B) Becomes colourless
2 Answers 1 views
The iron nail dipped in Copper Sulphate solution becomes brown and the blue colour of the Copper Sulphate solution fades.
D) Displacement
2 Answers 1 views
If we weigh a piece of iron and a piece of wood of same size, iron will weigh more. The reason is
D) density of iron is more than the density of wood
2 Answers 1 views
Assertion `(A)`: A small piece of zinc dissolves in dilute nitric acid but no hydrogen is evolved. Reason `(R)` : `HNO_3` is an oxidising acid and oxi
Correct Answer - A Both (A) and (R) are correct and (R) is the correct explanation of (A).
2 Answers 1 views
Statement-1: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and no `H_(2)`
Correct Answer - A Statement-2 is the correct explanation of statement-1
2 Answers 3 views
`ZnS` exists in two different form: zinc blende and wurtzite. Both occur in `4 : 4` coordination compounds. Zinc blende has an fcc structure and wurti
Correct Answer - T Factual statement.
2 Answers 1 views
Zinc carbonate is precipitated from zinc sulphate solution by the addition of:
Correct Answer - C Addition of `Na_(2)CO_(3)` gives zinc carbonate and zinc hydroxide . `NaHCO_(3)` is an acid salt.
2 Answers 1 views
Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ors of copper include chalcanthite `(Cu
Correct Answer - B `2CuFeS_(2)+O_(2)rarrCu_(2)S +SO_(2)uarr +2FeS` `2FeS+3O_(*2)rarr 2FeO+2SO_(2)uarr` `2Cu_(2)S+3O_(2)rarr2Cu_(2)O+2SO_(2)uarr`
2 Answers 1 views