Advertisements
Advertisements
प्रश्न
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Advertisements
उत्तर
If a zinc strip is immersed in a solution of copper sulphate, the blue colour of copper sulphate fades due to the formation of colourless zinc sulphate. The metal, copper, reddish-brown in colour is deposited on the zinc strip.
CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s)
APPEARS IN
संबंधित प्रश्न
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
How would you show that silver is chemically less reactive than copper?
Complete and balance the following equation:
Fill in the following blank with suitable word:
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
Why is white phosphorus kept immersed under water?
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Write the equation for the reaction of Iron with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
Name a metal which does not react with cold as well as hot water but reacts with steam.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
