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<\/span><\/u><\/b>
\nExercises<\/span><\/u><\/b><\/o:p><\/span><\/u><\/b><\/div>\n\n<\/div>\n
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1) Which of the following can be beaten into thin sheets?<\/o:p><\/span><\/i><\/b><\/div>\n\n
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen<\/o:p><\/span><\/i><\/b><\/div>\n\n<\/div>\n
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ANSWER \ud83d\ude41<\/span> a) Zinc<\/o:p><\/span><\/div>\n\n<\/div>\n
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2) Which of the following statements is correct?<\/o:p><\/span><\/i><\/b><\/div>\n\n
(a) All metals are ductile.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(b) All non-metals are ductile.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(c) Generally, metals are ductile.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(d) Some non-metals are ductile.<\/o:p><\/span><\/i><\/b><\/div>\n\n<\/div>\n
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ANSWER:-<\/span>c) Generally, metals are<\/span> ductile<\/o:p><\/span><\/div>\n\n<\/div>\n
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3) Fill in the blanks:<\/o:p><\/span><\/i><\/b><\/div>\n\n
(a) Phosphorus is a very __reactive__ non-metal.<\/span><\/o:p><\/span><\/div>\n\n
(b) Metals are __good__ conductors of heat and__electricity__.<\/span><\/o:p><\/span><\/div>\n\n
(c) Iron is __more__ reactive than copper.<\/span><\/o:p><\/span><\/div>\n\n
(d) Metals react with acids to produce __hydrogen__ gas.<\/span><\/o:p><\/span><\/div>\n\n<\/div>\n
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4) Mark \u2018T\u2019 if the statement is true and \u2018F\u2019 if it is false.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(a) Generally, non-metals react with acids. ( )<\/o:p><\/span><\/i><\/b><\/div>\n\n
(b) Sodium is a very reactive metal. ( )<\/o:p><\/span><\/i><\/b><\/div>\n\n
(c) Copper displaces zinc from zinc sulphate solution. ( )<\/o:p><\/span><\/i><\/b><\/div>\n\n
(d) Coal can be drawn into wires. ( )<\/o:p><\/span><\/i><\/b><\/div>\n\n<\/div>\n
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ANSWER:-<\/span> <\/o:p><\/span><\/div>\n\n
a)F<\/o:p><\/span><\/div>\n\n
b)T<\/o:p><\/span><\/div>\n\n
c)F<\/o:p><\/span><\/div>\n\n
d)F<\/o:p><\/span><\/div>\n\n<\/div>\n
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5) Some properties are listed in the following Table. Distinguish
\nbetween metals and non-metals on the basis of these properties.<\/o:p><\/span><\/i><\/b><\/div>\n\n
<\/span><\/i><\/b><\/div>\n\n
Properties. Metals Non-metal<\/o:p><\/span><\/i><\/b><\/div>\n\n
<\/span><\/i><\/b><\/div>\n\n
1. Appearance<\/o:p><\/span><\/i><\/b><\/div>\n\n
2. Hardness<\/o:p><\/span><\/i><\/b><\/div>\n\n
3. Malleability<\/o:p><\/span><\/i><\/b><\/div>\n\n
4. Ductility<\/o:p><\/span><\/i><\/b><\/div>\n\n
5. Heat<\/o:p><\/span><\/i><\/b><\/div>\n\n
Conduction<\/o:p><\/span><\/i><\/b><\/div>\n\n
6. Conduction of Electricity<\/o:p><\/span><\/i><\/b><\/div>\n\n<\/div>\n
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ANSWER:-<\/span><\/o:p><\/span><\/div>\n\n
Metals<\/span><\/b>-Lustrous, hard, Can be<\/span> beaten into thin sheets; Can be beaten into wires, Good
\nconductors of heat, Good conductors of electricity.<\/o:p><\/span><\/div>\n\n<\/div>\n
\n
Non-Metals<\/span><\/b>-dull, soft, Cannot be<\/span> beaten into thin sheets, Cannot be beaten into wires, Poor
\nconductors of heat, Poor conductors of electricity.<\/o:p><\/span><\/div>\n\n<\/div>\n
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6) Give reasons for the following.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(a) Aluminium foils are used to wrap food items.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(b) Immersion rods for heating liquids are made up of metallic
\nsubstances.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(c) Copper cannot displace zinc from its salt solution.<\/o:p><\/span><\/i><\/b><\/div>\n\n
(d) Sodium and potassium are stored in kerosene<\/o:p><\/span><\/i><\/b><\/div>\n\n<\/div>\n
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ANSWER \ud83d\ude41<\/span>a) Aluminium foils are<\/span> used to wrap food items because aluminium metal is
\nmalleable. Therefore, it can be beaten into thin foils.<\/o:p><\/span><\/div>\n\n
<\/span><\/div>\n\n
(b) Metals are good conductors of heat and electricity. Therefore,<\/span>
\nimmersion rods for heating liquids are made of metallic substances.<\/o:p><\/span><\/div>\n\n
<\/span><\/div>\n\n
(c) A metal can displace a less reactive metal from its salt in an
\naqueous solution. But zinc is more reactive than copper. Therefore,<\/span>
\ncopper cannot displace zinc from its salt solution.<\/o:p><\/span><\/div>\n\n
<\/span><\/div>\n\n
d) Sodium and potassium are stored in kerosene because they are
\nhighly reactive elements. They can easily catch fire even<\/span>
\nwhen in contact with air.<\/o:p><\/span><\/div>\n