The World of Metals and Non-metals NCERT Solutions - Class 7 Science | Kedovo | Kedovo
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The World of Metals and Non-metals
NCERT Solutions
NCERT Solutions
The World of Metals and Non-metals
10 Solutions
Q1
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Which metal is commonly used to make food packaging materials as it is cheaper, and its thin sheets can be folded easily into any shape?
(i)
Aluminium
(ii)
Copper
(iii)
Iron
(iv)
Gold
Q2
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Which of the following metal catches fire when it comes in contact with water?
(i)
Copper
(ii)
Aluminium
(iii)
Zinc
(iv)
Sodium
Q3
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State with reason(s) whether the following statements are True [T] or False [F].
(i)
Aluminium and copper are examples of non-metals used for making utensils and statues. [ ]
(ii)
Metals form oxides when combined with oxygen, the solution of which turns blue litmus paper to red. [ ]
(iii)
Oxygen is a non-metal essential for respiration. [ ]
(iv)
Copper vessels are used for boiling water because they are good conductors of electricity. [ ]
Q4
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Why are only a few metals suitable for making jewellery?
Q5
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Match the uses of metals and non-metals given in Column I with the jumbled names of metals and non-metals given in Column II. Column I Column II
(i)
Used in electrical wiring
(a)
E N X Y G O
(ii)
Most malleable and ductile
(b)
NECOHIRL
(iii)
Living organisms cannot survive without it.
(c)
PEPORC
(iv)
Plants grow healthy when fertilisers
(d)
TENGOINR containing it are added to the soil.
(v)
Used in water purification (e) O G D L
Q6
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What happens when oxygen reacts with magnesium and sulfur. What are the main differences in the nature of products formed?
Q7
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You are provided with the following materials. Discuss which material would be your choice to make a pan that is most suitable for boiling water and why?
Q8
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You are provided with three iron nails, each dipped in oil, water and vinegar. Which iron nail will not rust, and why?
Q9
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How do the different properties of metals and non-metals determine their uses in everyday life?
Q10
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One of the methods of protecting iron from getting rusted is to put a thin coating of zinc metal over it. Since sulfur does not react with water, can it be used for this purpose? Justify your answer.