Metals and non metals Worksheet-4

Metals and non metals Worksheet-4

 

Multiple-Choice Question (One Option Correct):

  1. What type of oxide is formed by metals.

(A) Acidic             (B) Basic               (C) Amphoteric             (D) A & B

(E) B and C

 

  1. What is the product formed when sodium is brunt in air.

(A) Na2O              (B) Na2O2             (C) NaO                         (D) NaO2

 

  1. The reaction of sodium and potassium with oxygen is

(A) Exothermic                                  (C) Endothermic

(C) No heat change occurs.              (D) Depends on the state of metal

 

  1. What are the products formed when Magnesium oxide MgO is dissolved in water?

(A) Mg(OH)2                                       (B) MgOH

(C) Mg2+ + H+ + OH+–                     (D) MgO(aq) + H2O(l)

 

  1. What type of oxide is formed by Aluminium ?

(A) Acidic             (B) Basic               (C) Amphoteric             (D) B and C

 

  1. A black substance is formed on the surface copper on prolonged heating in air. What is the chemical formula of that black substance?

(A) CuO                (B) Cu2O               (C) CuO2               (D) All of these

 

  1. What is the product  formed when iron is heated strongly in air?

(A) FeO                (B) Fe2O3              (C) Fe3O4              (D) Fe2O3.XH2O

 

  1. Why does Aluminium oxide (Al2O3) behave as an acidic oxide?

(A) In water it forms Aluminium hydride (AlH3) which looses H+ ions.

(B) It reacts with base giving salt and water.

(C) Both (A) and (B)

(D) It  turns blue litmus red .

 

  1. What are the products of the given reaction

(A) ZnCl2(aq) + H2O(l)                        (B) ZnCl2(aq) + H+ + OH

(C) Zn2Cl + H2O(l)                              (D) ZnCl + H2O(l)

 

  1. Why calcium starts floating on the surface when it is treated with water?

(A) Ca(OH)2 formed is lighter than water so it floats on the surface.

(B) Bubbles of hydrogen gas formed stick to the surface of metal.

(C) CaO formed floats on the surface.

(D) All of these

 

Answer key:

  1. (A)

  2. (A)

  3. (A)

  4. (A)

  5. (C) Aluminium oxide reacts with acid as well as base forming salt and water

  1. (A) Copper forms copper (II) oxide on prolonged heating in air.

  1. (C) Iron reacts with the oxygen of air on heating to form iron (I,II) Oxide.

  1. (B)

  2. (A)

  3. (B) Ca(s) + 2H2O → Ca(OH)2(aq) + H2(g)