class 10 science chapter number 3 ncrt hp board
Answers
Answer:
Explanation:
Question 1:
Compare the properties of a typical metal and non-metal on the basis of the following:
(i) nature of oxide formed by them
(ii) conductivity.
Answer :
(i) Metals from basic oxide, e.g., sodium gives a basic oxide, Na2O. Non-metals from acidic oxide, e.g., sulphur gives an acidic oxide, SO2.
(ii) Metals have good conductivity, e.g., copper is a good conductor. Non-metals do not conduct heat or electricity, e.g., sulphur.
Question 2:
How is an ore different from a mineral?
OR
“all ores are minerals but all minerals are not ores”. Justify the statement with examples.
Answer 2:
The metals found in nature in combined state are called minerals. If some minerals contain a very high percentage of a particular metal and the metals can be profitably and economically extracted, then it is called an ore.
Questions From Board Papers
Question 1:
Atmospheric air always contains moisture. Then, how can you protect iron articles from the affect of atmosphere?
Answer 1:
Iron articles can be protected from the effect of atmosphere by painting, oiling and greasing. This gives temporary protection to iron articles. For long time protection, galvanising or chrome plating are quite useful.
Question 2:
Explain, why some metals are more reactive and others less reactive and others less reactive?
OR
What determines the reactivity of metals?
Answer 2:
When metals react, they lose electrons to form positive ions. Such metals which can lose electrons easily to form positive ions when reacted with other substances, are reactive metals. On the other hand, if a metal loses electrons less rapidly to form positive ions, it will reacts slowly with other substances. Such a metal will be less reactive. For example, sodium atom is a very reactive metals because it readily loses one electron, forms a positive ion which then combines with other substances. On the other hand, lead atom loses electrons with difficulty to form positive ions, so lead metal is less reactive.
Important Questions On 10th Science Chapter 3
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Metals that are more reactive than hydrogen displace it from dilute acids.
For example: sodium and potassium.
Metals that are less reactive than hydrogen do not displace it.
For example: copper and silver.
What are the two important ways to prevent the rusting of iron?Platinum, gold and silver are used to make jewellery. Why?Why are Sodium, potassium and lithium stored under oil?Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. Why?Carbonate and Sulphide ores are usually converted into oxides during the process of extraction. Why?
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals page 40
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals page 46
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NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals page 53
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals page 55
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