Chapter - 3
Metals And Non-Metals
āϧাāϤু āĻā§°ু āĻ āϧাāϤু
EXERCISES
āĻŦ্ā§াā§াāĻŽ
1. Which of the following pairs will give displacement reactions?
1. āϤāϞ⧰ āĻোāύāĻো āϝোā§°াāĻ āĻŦিāĻ্āϝুāϤি āĻŦিāĻ্ā§°িāϝ়া āĻĻিāĻŦ?
(a) NaCl solution and copper metal
(āĻ) NaCl āĻĻ্ā§°ā§ą āĻā§°ু āϤাāĻŽā§° āϧাāϤু
(b) MgCl2, solution and aluminium metal
(āĻ) MgCl2, āĻĻ্ā§°ā§ąāĻŖ āĻā§°ু āĻāϞুāĻŽিāύিāϝ়াāĻŽ āϧাāϤু
(c) FeSO 4, solution and silver metal
(āĻ) FeSO 4, āĻĻ্ā§°ā§ąāĻŖ āĻā§°ু ā§°ূāĻĒাāϞী āϧাāϤু
(d) AgNO3, solution and copper metal.
(āĻ) AgNO3, āĻĻ্ā§°ā§ąāĻŖ āĻā§°ু āϤাāĻŽā§° āϧাāϤু।
Answer:-
2. Which of the following methods is suitable for preventing an iron frying pan from rusting?
⧍) āϞোāĻšাā§° āĻĢ্ā§°াāĻ āĻĒেāύāϤ āĻŽā§°িāĻা āĻĒā§°াā§° āĻĒā§°া ā§°āĻ্āώা āĻā§°িāĻŦāϞৈ āϤāϞ⧰ āĻোāύāĻো āĻĒāĻĻ্āϧāϤি āĻāĻĒāϝোāĻী?
(a) Applying grease
(āĻ) āĻ্āϰীāĻ āĻĒ্āϰāϝ়োāĻ āĻā§°া
(b) Applying paint
(āĻ) ā§°ং āϞāĻাāĻ āĻĻিāϝ়া
(c) Applying a coating of zinc
(āĻ) āĻিংāĻā§° āĻā§ąā§°āĻŖ āĻĒ্ā§°āϝ়োāĻ āĻā§°া
(d) All of the above.
(āĻ) āĻāĻĒā§°ā§° āϏāĻāϞোāĻŦোā§°।
Answer;-
3. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
ā§Š) āĻāĻা āĻŽৌāϞে āĻ āĻ্āϏিāĻেāύ⧰ āϞāĻāϤ āĻŦিāĻ্ā§°িāϝ়া āĻā§°ি āĻāĻ্āĻ āĻāϞāύাংāĻā§° āϝৌāĻ āĻāĻা āĻĻিāϝ়ে। āĻāĻ āϝৌāĻāĻো āĻĒাāύীāϤো āĻĻ্ā§°ā§ąীāĻূāϤ। āĻŽৌāϞāĻো āĻšোā§ąাā§° āϏāĻŽ্āĻাā§ąāύা āĻāĻে
(a) calcium
(āĻ) āĻেāϞāĻিāϝ়াāĻŽ
(b) carbon
(āĻ) āĻাā§°্āĻŦāύ
(c) silicon
(āĻ) āĻিāϞিāĻāύ
(d) iron.
(āĻ) āϞোāĻšা।
Answer:-
4. Food cans are coated with tin and not with zinc because
ā§Ē/ āĻাāĻĻ্āϝ⧰ āĻেāύāϤ āĻিāύ⧰ āĻā§ąā§°āĻŖ āĻĻিāϝ়া āĻšāϝ় āĻā§°ু āĻিংāĻā§° āĻā§ąā§°āĻŖ āĻĻিāϝ়া āύāĻšāϝ় āĻাā§°āĻŖ...
(a) zinc is costlier than tin.
(āĻ) āĻিāύāϤāĻৈ āĻিংāĻ āĻŦ্āϝāϝ়āĻŦāĻšুāϞ।
(b) zinc has a higher melting point than tin.
(āĻ) āĻিংāĻā§° āĻāϞāύাংāĻ āĻিāύāϤāĻৈ āĻŦেāĻি।
(c) zinc is more reactive than tin.
(āĻ) āĻিংāĻ āĻিāύāϤāĻৈ āĻ āϧিāĻ āĻŦিāĻ্ā§°িāϝ়াāĻļীāϞ।
(d) zinc is less reactive than tin.
(āĻ) āĻিংāĻ āĻিāύāϤāĻৈ āĻāĻŽ āĻŦিāĻ্ā§°িāϝ়াāĻļীāϞ।
Answer:-
5. You are given a hammer, a battery, a bulb, wires and a switch.
ā§Ģ/ āĻāĻĒোāύাāĻ āĻāĻা āĻšাāϤুā§°ী, āĻāĻা āĻŦেāĻাā§°ী, āĻāĻা āĻŦাāϞ্āĻŦ, āϤাঁā§° āĻā§°ু āĻāĻা āĻুāĻāĻ āĻĻিāϝ়া āĻšৈāĻে।
(a) How could you use them to distinguish between samples of metals and non-metals?
(āĻ) āϧাāϤু āĻā§°ু āĻ āϧাāϤুā§° āύāĻŽুāύাā§° āĻŽাāĻāϤ āĻĒাā§°্āĻĨāĻ্āϝ āĻā§°িāĻŦāϞৈ āĻāĻĒুāύি āϏেāĻāĻŦোā§° āĻেāύেāĻৈ āĻŦ্āĻ¯ā§ąāĻšাā§° āĻā§°িāĻŦ āĻĒাā§°িāϞেāĻšেঁāϤেāύ?
Answer:-
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals.
(āĻ) āϧাāϤু āĻā§°ু āĻ āϧাāϤুā§° āĻŽাāĻāϤ āĻĒাā§°্āĻĨāĻ্āϝ āύিā§°্āĻŖāϝ় āĻā§°াāϤ āĻāĻ āĻĒā§°ীāĻ্āώাāϏāĻŽূāĻšā§° āĻāĻĒāϝোāĻিāϤা āĻŽূāϞ্āϝাāϝ়āύ āĻā§°া।
Answer:-
6. What are amphoteric oxides? Give two examples of amphoteric oxides.
ā§Ŧ/ āĻāĻŽ্āĻĢোāĻেā§°িāĻ āĻ āĻ্āϏাāĻāĻĄ āĻি āĻি? āĻāĻŽ্āĻĢোāĻেā§°িāĻ āĻ āĻ্āϏাāĻāĻĄā§° āĻĻুāĻা āĻāĻĻাāĻšā§°āĻŖ āĻĻিāϝ়া।
Answer:-
7. Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
ā§) āĻĻুāĻা āϧাāϤুā§° āύাāĻŽ āϞিāĻা āϝিāϝ়ে āĻĒাāϤāϞ āĻāĻিāĻĄā§° āĻĒā§°া āĻšাāĻāĻĄ্ā§°āĻেāύāĻ āϏ্āĻĨাāύāĻ্āϝুāϤ āĻā§°িāĻŦ, āĻā§°ু āĻĻুāĻা āϧাāϤুā§° āύাāĻŽ āϞিāĻা āϝিāϝ়ে āύāĻš’āĻŦ।
Answer:-
8. In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
8. āĻāĻা āϧাāϤু M ā§° āĻāϞেāĻ্āĻ্ā§°’āϞাāĻāĻিāĻ ā§°িāĻĢাāĻāύিāĻāϤ āĻāĻĒুāύি āĻāύোāĻĄ, āĻেāĻĨ’āĻĄ āĻā§°ু āĻāϞেāĻ্āĻ্ā§°’āϞাāĻāĻ āĻšিāĻাāĻĒে āĻি āϞ’āĻŦ?
Answer:-
9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by Inverting a test tube over it, as shown in figure below.
⧝) āĻĒ্ā§°āϤ্āϝুāώে āϏ্āĻĒেāĻুāϞাāϤ āĻাāϞāĻĢাā§° āĻুāĻĄ়ি āϞৈ āĻā§°āĻŽ āĻā§°িāϞে। āϤেāĻঁ āϤāϞ⧰ āĻিāϤ্ā§°āϤ āĻĻেāĻুāĻā§ąাā§° āĻĻā§°ে āĻāϝ়াā§° āĻāĻĒā§°āϤ āĻāĻা āĻĒā§°ীāĻ্āώা āύāϞী āĻāϞোāĻা āĻā§°ি āĻŦিāĻāĻļিāϤ āĻšোā§ąা āĻেāĻāĻো āϏংāĻ্ā§°āĻš āĻā§°িāĻিāϞ।
(a) What will be the action of gas on
(āĻ) āĻেāĻā§° āĻ্ā§°িāϝ়া āĻি āĻš’āĻŦ
(i) dry litmus paper?
(i) āĻļুāĻাāύ āϞিāĻāĻŽাāĻ āĻাāĻāĻ?
(ii) moist litmus paper?
(ii) āĻā§°্āĻĻ্ā§° āϞিāĻāĻŽাāĻ āĻাāĻāĻ?
(b) Write a balanced chemical equation for the reaction taking place.
(āĻ) āϏংāĻāĻিāϤ āĻšোā§ąা āĻŦিāĻ্ā§°িāϝ়াāĻোā§° āĻŦাāĻŦে āĻāĻা āϏুāώāĻŽ ā§°াāϏাāϝ়āύিāĻ āϏāĻŽীāĻā§°āĻŖ āϞিāĻা।
Answer:-
10. State two ways to prevent the rusting of iron.
ā§§ā§Ļ) āϞোāĻšাā§° āĻŽā§°িāĻা āĻĒā§°া ā§°োāϧ āĻā§°াā§° āĻĻুāĻা āĻāĻĒাāϝ় āĻāϞ্āϞেāĻ āĻā§°া।
Answer:-
11. What type of oxides are formed when non-metals combine with oxygen?
ā§§ā§§) āĻ āϧাāϤুāĻŦোā§° āĻ āĻ্āϏিāĻেāύ⧰ āϞāĻāϤ āĻŽিāϞিāϞে āĻি āϧ⧰āĻŖā§° āĻ āĻ্āϏাāĻāĻĄ āĻāĻ āύ āĻšāϝ়?
Answer:-
12. Give reasons
⧧⧍) āĻাā§°āĻŖ āĻĻিāϝ়া
(a) Platinum, gold and silver are used to make jewellery.
(āĻ) āĻāĻšāύা āϤৈāϝ়াā§° āĻā§°িāĻŦāϞৈ āĻĒ্āϞেāĻিāύাāĻŽ, āϏোāĻŖ āĻā§°ু ā§°ূāĻĒ āĻŦ্āĻ¯ā§ąāĻšাā§° āĻā§°া āĻšāϝ়।
Answer:-
(b) Sodium, potassium and lithium are stored under oil.
(āĻ) āĻāĻĄিāϝ়াāĻŽ, āĻĒāĻাāĻিāϝ়াāĻŽ āĻā§°ু āϞিāĻĨিāϝ়াāĻŽ āϤেāϞ⧰ āϤāϞāϤ āϏংā§°āĻ্āώāĻŖ āĻā§°া āĻšāϝ়।
Answer:-
(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
(āĻ) āĻāϞুāĻŽিāύিāϝ়াāĻŽ āĻāĻা āĻ āϤি āĻŦিāĻ্ā§°িāϝ়াāĻļীāϞ āϧাāϤু, āϤāĻĨাāĻĒিāĻ āĻāϝ়াāĻ ā§°āύ্āϧা-āĻŦāĻĸ়াā§° āĻŦাāĻŦে āĻŦাāĻāύ-āĻŦā§°্āϤāύ āϤৈāϝ়াā§° āĻā§°াāϤ āĻŦ্āĻ¯ā§ąāĻšাā§° āĻā§°া āĻšāϝ়।
Answer:-
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
(āĻ) āύিāώ্āĻাāĻļāύ āĻĒ্ā§°āĻ্ā§°িāϝ়াā§° āϏāĻŽāϝ়āϤ āϏাāϧাā§°āĻŖāϤে āĻাā§°্āĻŦāύেāĻ āĻā§°ু āĻাāϞāĻĢাāĻāĻĄ āĻ āĻ্āϏাāĻāĻĄāϞৈ ā§°ূāĻĒাāύ্āϤ⧰িāϤ āĻšāϝ়।
Answer:-
13. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
ā§§ā§Š) āĻāϞংāĻিāϤ āϤাāĻŽā§° āĻĒাāϤ্ā§°āĻŦোā§° āύেāĻŽু āĻŦা āĻ āĻŽিāϤাā§° ā§°āϏেā§°ে āĻĒā§°িāώ্āĻাā§° āĻā§°া āĻĻেāĻিāĻে āύিāĻļ্āĻāϝ়। āĻĒাāϤ্ā§°āĻŦোā§° āĻĒā§°িāώ্āĻাā§° āĻā§°াāϤ āĻāĻ āĻেāĻা āĻĒāĻĻাā§°্āĻĨāĻŦোā§° āĻিāϝ় āĻĢāϞāĻĒ্ā§°āϏূ āĻšāϝ় āĻŦুāĻাāĻ āĻĻিāϝ়া।
Answer:-
14. Differentiate between metal and non-metal on the basis of their chemical properties.
ā§§ā§Ē) āϧাāϤু āĻā§°ু āĻ āϧাāϤুā§° ā§°াāϏাāϝ়āύিāĻ āϧ⧰্āĻŽā§° āĻিāϤ্āϤিāϤ āĻĒাā§°্āĻĨāĻ্āϝ āĻā§°া।
Answer:-
15. A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
ā§§ā§Ģ) āĻāĻāύ āĻŽাāύুāĻšে āϏোāĻŖāĻাā§°ā§° ā§°ূāĻĒ āϞৈ āĻĻুā§ąাā§°ে āĻĻুā§ąাā§°ে āĻৈāĻিāϞ। āĻĒুā§°āĻŖি āĻā§°ু āύিāϏ্āϤেāĻ āϏোāĻŖā§° āĻ āϞংāĻাā§°ā§° āĻিāϞিāĻāύি āĻূā§°াāĻ āĻ āύাā§° āĻĒ্ā§°āϤিāĻļ্ā§°ুāϤি āĻĻিāϞে। āĻāĻā§°াāĻী āϏāύ্āĻĻেāĻšāĻšীāύ āĻāĻĻ্ā§°āĻŽāĻšিāϞাāĻ āϤেāĻঁāĻ āϏোāĻŖā§° āĻŦেংāĻāϞ⧰ āĻেāĻ āĻāĻা āĻĻিāϞে āϝিāĻো āϤেāĻঁ āĻāĻা āĻŦিāĻļেāώ āϏāĻŽাāϧাāύāϤ āĻĄুāĻŦাāĻ āĻĻিāϞে। āĻŦেংāĻāϞāĻŦোā§° āύāϤুāύ⧰ āĻĻā§°ে āĻিāϞিāĻি āĻāĻ িāĻিāϞ āϝāĻĻিāĻ āĻāĻāύ āĻŦāĻšু āĻĒā§°িāĻŽাāĻŖে āĻš্ā§°াāϏ āĻĒাāĻāĻিāϞ। āĻāĻĻ্ā§°āĻŽāĻšিāϞাāĻā§°াāĻী āĻŦিāĻāϞিāϤ āĻšৈāĻিāϞ āϝāĻĻিāĻ āĻ āϏাā§° āϤ⧰্āĻā§° āĻĒিāĻāϤ āĻŽাāύুāĻšāĻāύে āĻā§°āĻেāĻĻাāĻৈ āĻĒিāĻুā§ąাāĻ āϝোā§ąাā§° āĻĒিāĻāϤ āĻĒ্ā§°āĻšাā§° āĻā§°ে। āϤেāĻঁ āĻŦ্āĻ¯ā§ąāĻšাā§° āĻā§°া āϏāĻŽাāϧাāύ⧰ āĻĒ্ā§°āĻৃāϤি āĻাāύিāĻŦāϞৈ āĻোāϝ়েāύ্āĻĻাāĻāύ⧰ āĻā§°িāϤ্ā§°āϤ āĻ āĻিāύāϝ় āĻā§°িāĻŦ āĻĒাā§°িāĻŦāύে?
Answer:-
16. Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
ā§§ā§Ŧ) āϤীāĻা (āϞোā§° āĻŽিāĻļ্ā§°āĻŖ) āύāĻšāϝ়, āĻā§°āĻŽ āĻĒাāύীā§° āĻেংāĻি āĻŦāύাāĻŦāϞৈ āϤাāĻŽ āĻŦ্āĻ¯ā§ąāĻšাā§° āĻā§°াā§° āĻাā§°āĻŖāϏāĻŽূāĻš āĻোā§ąা।
Answer:-
Type by - Pinku Moni Bora .