Metals and non metals Worksheet-5

Metals and non metals Worksheet-5

 

Multiple-Choice Question (One Option Correct):

  1. What are the products formed when metals react with water?

(A) Metal hydride                            (B) Metal hydroxide + Hydrogen

(C) Metal Oxide + Hydrogen         (D) All of these

 

  1. What are the products formed when metals react with steam?

(A) Metal hydride                            (B) Metal hydroxide + Hydrogen

(C) Metal Oxide + Hydrogen         (D) All of these

 

  1. The reaction of potassium with water is

(A) Exothermic                                 (B) Endothermic          

(C) No heat change occurs             (D) None of these

 

  1. Why a piece of sodium metal catches fire when dropped in a glass beaker filled with water?

(A) Large amount of heat is evolved due to the formation of Na2O and H2(g)

(B) Large amount of heat is evolved due to the formation of NaOH and H2(g).

(C) Hydrogen gas formed during the reaction catches fire and burns causing little explosion

(D) Sodium metal reacts with oxygen catching fire.

(E) Both B and C

(F) Both A and C

 

  1. The reactivity of Magnesium with water is less than Calcium  as-

(A) Heat is not evolved in the reaction of magnesium with cold water.

(B) With cold water Mg forms Magnesium hydroxide where as Ca forms Calcium oxide

(C) Magnesium reacts with hot water where as calcium reacts with cold water.

(D) Magnesium is smaller than calcium in size.

 

  1. What are the products formed in the given reaction.

(A) Fe2O3 + H2(g)                               (B) FeO + H2(g)

(C) Fe3O4(g) + H2(g)                            (D) All of these

 

  1. Aluminium metal does not react with water under ordinary conditions because

(A) Of a layer of aluminium carbonate on its surface

(B) Of a layer of  aluminium oxide on its surface

(C) Of a layer of aluminium Nitride on its surface

(D) All of these

 

  1. Arrange Zinc, aluminium, iron, and magnesium in the decreasing order of their reactivity.

(A) Al > Mg > Zn > Fe                       (B) Mg > Al > Zn > Fe

(C) Zn > Mg > Al > Fe                       (D) Fe > Al > Zn > Mg

 

  1. What are the products formed in the given reaction?

(A) Al2(SO4)3 + 3H2(g)                        (B) Al2O3 + Al2(SO4)3 + H2(g)

(C) Al2SO4 + H2(g)                              (D) Al2(SO4)3 + H2O(l)

 

  1. Initially the reaction of Aluminium with dilute acids is slow due to –

(A) A thin layer of aluminium carbonate on its surface.

(B) A thin layer of aluminium carbide on its surface.

(C) A thin layer of aluminium oxide on its surface.

(D) A thin layer of aluminium sulphide on its surface

 

Answer key:

  1. (B) Example

  2. (C) Example

  3. (A) Potassium is a very reactive metal, it reaction with water is exothermic.

  4. (E)

  5. (C)

  6. (C)

  7. (B)

  8. (B)

  9. (A)

  10. (C)