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CBSE Worksheet-16

Class–VIII Science (Metals and non metals)

1. Hard and brittle form of iron with a high carbon content is :-

a. wrought iron

b. steel

c. pig iron

d. rust

2. A reaction in which more reactive metal replaces a less reactive metal from its salt

solution is called :-

a. addition reaction

b. double displacement reaction

c. exothermic reaction

d. displacement reaction

3. Crolite is an ore of :-

a. aluminium

b. boron

c. copper

d. iron

!. "n sweets# thin sheets of which of the following metals is put :-

a. aluminium

b. silver

c. copper

d. platinum

$. %atch the column :-

Non-metals Uses

a. &ulphur i' bleaching

b. (hosphorus ii' respiration

c. "xgen iii' fuel

d. Chlorine iv' ma)ing gun powder

e. Hdrogen v' fertili*ers

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+. ,ill in the blan)s :-

a. %ercur is the onl metal found in state at room temperature.

b. n nature# metals are mostl found as compounds called .

c. %etals can be drawn into wires and this propert is called .

d. /he propert of metals b which the can be hammered into ver thin sheets

without brea)ing is called .

e. %etals are conductors of heat and electricit.

0. "ther than iron do an metal get rusted f es explain how

. How will ou prove the nature of metal oxides

. (ic) the odd word out of the following:

Au4Ag4(t454C

16. 7hat is the following picture of

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 ns!er "e#$-

1. c

2. d

3. a

!. b

$. a. iv# b. v# c. ii# d. i# e. iii.

+. li8uid# minerals# ductilit# malleabilit# good.

0. 9es copper also gets rusted in moist air and ac8uires a dull non shin' green coating.

Copper gets corroded or rusted in the presence of carbon dioxide and water to form a

green coating# which is a mixture of copper hdroxide and copper carbonate.

2Cu+H2O+CO2+O2  →  Cu(OH)2 + CuCO3 

. f we burn a magnesium ribbon# white ash of magnesium oxide is formed. ;ow b

adding little water to white ash we can prepare solution of magnesium oxide. 7hen

we dip red litmus paper into this solution it turns blue while when we dip blue litmus

paper into this solution colour remains unchanged. t proves that metal oxides are

basic in nature.

. C is odd because it is carbon which is a non metal while all other are metals.

16. t is an aluminium sheet4foil.