NCERT Solutions for Class 8 Science Chapter 4 Materials Metals and Non – Metals

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Q.1: Which of the following can be beaten into thin sheets? 
(a) Zinc
(b) Phosphorus
(c) Sulphur 
(d) Oxygen

Ans : (a) Zinc 

Q.2: Which of the following statements is correct?
(a) All metals are ductile. 
(b) All non-metals are ductile. 
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.

Ans : (c) Generally, metals are ductile 
However, mercury metal— a liquid at room temperature — cannot be drawn into 
wires and is not ductile. 

Q.3: Fill in the blanks.
(a) Phosphorus is a very________ non-metal.
(b) Metals are _________ conductors of heat and ________ .
(c) Iron is ___________ reactive than copper. 
(d) Metals react with acids to produce _________ gas

Ans : (a) Phosphorus is a very  reactive  non-metal. 
(b) Metals are  good  conductors of heat and  electricity  
(c) Iron is  more  reactive than copper. 
(d) Metals react with acids to produce hydrogen gas. 

Q.4: Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) Generally, non-metals react with acids. ( )
(b) Sodium is a very reactive metal. ( ) 
(c) Copper displaces zinc from zinc sulphate solution. ( ) 
(d) Coal can be drawn into wires( )

Ans : (i) Generally, non-metals react with acids. (F) 
(ii) Sodium is a very reactive metal. (T) 
(iii) Copper displaces zinc from zinc sulphate solution. (F) 
(iv) Coal can drawn into wires, (F) 

Q.5: Give reasons for the following. 
(a) Aluminium foils are used to wrap food items. 
(b) Immersion rods for heating liquids are made up of metallic substances. 
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene

Ans : (a) Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils. 
(b) Metals are good conductors of heat and electricity. Therefore, immersion rods for heating 
liquids are made of metallic substances. 
(c) A metal can displace a less reactive metal from its salt in an aqueous solution. 
But zinc is more reactive than copper. Therefore, copper cannot displace zinc from its salt 
solution. Cu(s) + ZnS04 (aq) No reaction 
(d) Sodium and potassium are stored in kerosene because they are highly reactive elements. 
They can easily catch fire even when in contact with air. 

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