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Class 9 Chemistry Chemical Reactivity 7. Explain why alkali metals do not exists free in nature?


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7. Explain why alkali metals do not exists free in nature?

14. Which metal is used for metal work?
14. Which metal is used for metal work?

14. Which metal is used for metal work?

1. Which one metal belongs to Alkaline earth metal?(a) \mathrm{B} (b) \mathrm{Bi} (c) \mathrm{Br} (d) \mathrm{Ba}
1. Which one metal belongs to Alkaline earth metal?(a)  \mathrm{B} (b)  \mathrm{Bi} (c)  \mathrm{Br} (d)  \mathrm{Ba}

1. Which one metal belongs to Alkaline earth metal?(a) \mathrm{B} (b) \mathrm{Bi} (c) \mathrm{Br} (d) \mathrm{Ba}

2. Which one of the following metal burns with a brick red flame?(a) Sodium(b) Magnesium(c) Iron(d) Calcium
2. Which one of the following metal burns with a brick red flame?(a) Sodium(b) Magnesium(c) Iron(d) Calcium

2. Which one of the following metal burns with a brick red flame?(a) Sodium(b) Magnesium(c) Iron(d) Calcium

6. Define following with examples: -1. Cation1
6. Define following with examples: -1. Cation1

6. Define following with examples: -1. Cation1

15. Why magnesium is harder than sodium?
15. Why magnesium is harder than sodium?

15. Why magnesium is harder than sodium?

3. Why nitrogen forms compounds with alkaline earth metals directly?
3. Why nitrogen forms compounds with alkaline earth metals directly?

3. Why nitrogen forms compounds with alkaline earth metals directly?

4. Which one is strong acid?(a) \mathrm{HF} (b) \mathrm{HCl} (c) \mathrm{HBr} (d) \mathrm{HI}
4. Which one is strong acid?(a)  \mathrm{HF} (b)  \mathrm{HCl} (c)  \mathrm{HBr} (d)  \mathrm{HI}

4. Which one is strong acid?(a) \mathrm{HF} (b) \mathrm{HCl} (c) \mathrm{HBr} (d) \mathrm{HI}

8. Which one of the following act as oxidizing agent?(a) \mathrm{Be} (b) M g (c) \mathrm{Na} (d) \mathrm{Cl}
8. Which one of the following act as oxidizing agent?(a)  \mathrm{Be} (b)  M g (c)  \mathrm{Na} (d)  \mathrm{Cl}

8. Which one of the following act as oxidizing agent?(a) \mathrm{Be} (b) M g (c) \mathrm{Na} (d) \mathrm{Cl}

How you can compare the softness and hardness of metals?
How you can compare the softness and hardness of metals?

How you can compare the softness and hardness of metals?

7. Arrange the followingstrength: \mathrm{HBr} \mathrm{HCl} \mathrm{HI} \mathrm{HF} Halogen Acids in increasing order of their Acidic
7. Arrange the followingstrength:  \mathrm{HBr} \mathrm{HCl} \mathrm{HI} \mathrm{HF} Halogen Acids in increasing order of their Acidic

7. Arrange the followingstrength: \mathrm{HBr} \mathrm{HCl} \mathrm{HI} \mathrm{HF} Halogen Acids in increasing order of their Acidic

6. Explain the position of Sodium in periodic table and its importance.
6. Explain the position of Sodium in periodic table and its importance.

6. Explain the position of Sodium in periodic table and its importance.

6. Define following with examples: -2. Anion।
6. Define following with examples: -2. Anion।

6. Define following with examples: -2. Anion।

3. Explain the experiment to test \mathrm{Cl} and I lons.
3. Explain the experiment to test  \mathrm{Cl}  and I lons.

3. Explain the experiment to test \mathrm{Cl} and I lons.

10. Non-metals are generally soft but which one of the following is extremely hard?(a) Graphite(b) Phosphorus(c) Iodine(d) Diamond
10. Non-metals are generally soft but which one of the following is extremely hard?(a) Graphite(b) Phosphorus(c) Iodine(d) Diamond

10. Non-metals are generally soft but which one of the following is extremely hard?(a) Graphite(b) Phosphorus(c) Iodine(d) Diamond

3. Sodium is extremely reactive metal but it does not react with:(a) Hydrogen(b) Nitrogen(c) Sulphur(d) Phosphorus
3. Sodium is extremely reactive metal but it does not react with:(a) Hydrogen(b) Nitrogen(c) Sulphur(d) Phosphorus

3. Sodium is extremely reactive metal but it does not react with:(a) Hydrogen(b) Nitrogen(c) Sulphur(d) Phosphorus

Compare the physical properties of metals and non-metals.
Compare the physical properties of metals and non-metals.

Compare the physical properties of metals and non-metals.

5. Explain the position of Magnesium in periodic table and its importance.
5. Explain the position of Magnesium in periodic table and its importance.

5. Explain the position of Magnesium in periodic table and its importance.

3. What are Alkaline Earth Metals? Write names and symbols of Alkaline earth metals?
3. What are Alkaline Earth Metals? Write names and symbols of Alkaline earth metals?

3. What are Alkaline Earth Metals? Write names and symbols of Alkaline earth metals?

1. Identify the elements as Metals Non-metals and Metalloids from the following elements:-
1. Identify the elements as Metals Non-metals and Metalloids from the following elements:-
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1. Identify the elements as Metals Non-metals and Metalloids from the following elements:-

8. Explain Electronegative character of non-metals.
8. Explain Electronegative character of non-metals.
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8. Explain Electronegative character of non-metals.

9. Which one of the following non-metal is lustrous?(a) Sulphur(b) Phosphorus(c) Iodine(d) Carbon
9. Which one of the following non-metal is lustrous?(a) Sulphur(b) Phosphorus(c) Iodine(d) Carbon
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9. Which one of the following non-metal is lustrous?(a) Sulphur(b) Phosphorus(c) Iodine(d) Carbon

7. Explain why alkali metals do not exists free in nature?
7. Explain why alkali metals do not exists free in nature?
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7. Explain why alkali metals do not exists free in nature?

13. What is the trend of variation in densities of alkali metals?
13. What is the trend of variation in densities of alkali metals?
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13. What is the trend of variation in densities of alkali metals?

2. Which one is Barium(a) \mathrm{Bi} (b) \mathrm{Be} (c) \mathrm{Ba} (d) \mathrm{Br}
2. Which one is Barium(a)  \mathrm{Bi} (b)  \mathrm{Be} (c)  \mathrm{Ba} (d)  \mathrm{Br}
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2. Which one is Barium(a) \mathrm{Bi} (b) \mathrm{Be} (c) \mathrm{Ba} (d) \mathrm{Br}

10. Why silver and gold are least reactive?
10. Why silver and gold are least reactive?
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10. Why silver and gold are least reactive?

3. Chlorine can be displaced by(a) \mathrm{F} (b) \mathrm{Br} (c) \mathrm{I} (d) \mathrm{At}
3. Chlorine can be displaced by(a)  \mathrm{F} (b)  \mathrm{Br} (c)  \mathrm{I} (d)  \mathrm{At}
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3. Chlorine can be displaced by(a) \mathrm{F} (b) \mathrm{Br} (c) \mathrm{I} (d) \mathrm{At}

7. Which one is Metalloid?(a) \mathrm{Br} (b) \mathrm{Se} (c) \mathrm{S} (d) \mathrm{Sr}
7. Which one is Metalloid?(a)  \mathrm{Br} (b)  \mathrm{Se} (c)  \mathrm{S} (d)  \mathrm{Sr}
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7. Which one is Metalloid?(a) \mathrm{Br} (b) \mathrm{Se} (c) \mathrm{S} (d) \mathrm{Sr}

9. Why ionization energies of alkaline earth metals are higher than alkali metals?
9. Why ionization energies of alkaline earth metals are higher than alkali metals?
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9. Why ionization energies of alkaline earth metals are higher than alkali metals?

Discuss why hardness and softness of a metal depends upon its metallic bonding.
Discuss why hardness and softness of a metal depends upon its metallic bonding.
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Discuss why hardness and softness of a metal depends upon its metallic bonding.

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