Metals and non metals Worksheet-9

Metals and non metals Worksheet-9

 

Multiple-Choice Question (One Option Correct):

  1. The oil used in froth floatation process for the concentration of ores is

(A) Coconut oil    (B) Olive oil         (C) Pine oil           (D) None of these

 

  1. Heating  of an ore in air is known as–

(A) Roasting        (B) Calcination    (C) Smelling         (D) Bassemerisation

 

  1. Which element is used as reducing agent in smelting?

(A) C                     (B) Al                    (C) Zn                   (D) None of these

 

  1. Calcium is extracted from Calcium chloride (CaCl2) by-

(A) Electrolysis                                 (B) Reducing by Aluminium

(C) Smelting                                      (D) Auto reduction

 

  1. The oxides of manganese and chromium metals are not reduced by carbon so they are extracted by reduction of their oxides with

(A) Calcium         (B) Magnesium   (C) Aluminium    (D) All of these

 

  1. During electrolytic refining of metal anode is made of

(A) Thin & Trip of pure metal        (B) Thick block of impure metal

(C) Graphite                                       (D) Lead

 

  1. Impurities like arsenic,phosphorous are removed from haematite by

(A) calcinations                                (B) roasting

(C) gravity separation                     (D) smelting

 

Answer key:

  1. (C)

  2. (A)

  3. (A) Heating of metal oxide with carbon is called smelting.

  4. (A) Calcium is a highly reactive metal so it is extracted by electrolysis of its molten chlorides or oxides.

  5. (C)

  6. (B)

  7. (A)