Solutions of Metals and Non-metals (Page No - 136) - Chemistry Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Question 89:
An element E forms an oxide E₂ An aqueous solution of E₂O turns red litmus paper blue.
(a) What is the nature of the oxide E₂O ?
(b) State whether element E is a metal or a non-metal.
(a) Give one example of an element like E.
Solution :
(a) Basic oxide.
(b) Metal .
(c) Sodium, Na .

Question 90:
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.
(d) Name one metal like B.
Solution :
(a) Amphoteric oxide .
(b) Amphoteric oxide .
(c) Aluminium, Al.
(d) Zinc, Zn .

Question 91:
An element X forms two oxides XO and XO₂. The oxide XO has no action on litmus solution but oxide X02turns litmus solution red.
(a) What is the nature of oxide XO ?
(b) What is the nature of oxide XO₂ ?
(c) Would you call element X a metal or a non-metal ? Give reason for your choice.
(d) Can you give an example of element like X ?
Solution :
(a) Neutral oxide.
(b) Acidic o xide .
(c) X is non-metal because non-metals form acidic and basic oxide .
(d) Carbon, C .

Question 92:
State and explain the reactions, if any, of the following metals with a solution of copper sulphate :
(a) Gold (b) Copper (c) Zinc (d) Mercury
Solution :
(a) No displacement reaction will take place because go ld is less reactive than copper.
(b) No reaction will take place between copper and copper sulphate solution ; there is no reaction possible.
(c) Zinc displaces copper from copper sulphate solution to form zinc sulphate solution and copper metal because zinc is m ore reactive than copper .
(d) No displacement reaction will take place because mercury is less reactive than copper

Question 93:
(a) Give the names and formulae of one metal chloride and one non-metal chloride.
(b) State an important property in which these metal chloride and non-metal chloride differ.
(c) Why do they differ in this property ?
Solution :
Non-metal chloride:
Carbon tetrachloride, CCl ₄
(b) Sodium chloride solution conducts electricity whereas carbon tetrachlori de does not conduct electricity.
(c) Sodium chloride is an ionic compound whereas carbon tetrachloride is a covalent compound.