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Class 11 Chemistry (Part Ii) Chapter 10 The S Block Elements Quiz 2 (17 MCQs)

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1. What is the characteristic flame color of strontium?

Correct Answer: D) Blood red.

2. Which s-block element has the highest solubility of its sulphate?

Correct Answer: D) Mg.

3. As compared to K, Na has

Correct Answer: A) Higher ionization potential.

4. Beryllium shows diagonal relationship with

Correct Answer: C) Al.

5. The tendency to lose the valence electrons easily by Alkali metals makes them

Correct Answer: B) Strong reducing agent.

6. Which one of the following alkali metals forms only normal oxide when it reacts with O2?

Correct Answer: A) Li.

7. M is an amphoteric oxide of Period 3. The first three ionisation energy of M increase gradually but the fourth ionisation energy increase sharply. Why the fourth ionisation energy of M is higher than expected?

Correct Answer: B) The electronic configuration of M is 1s$^{2}$2s$^{2}$2p$^{6}$3s$^{2}$3p$^{1}$.

8. Which s-block element is known for its use in fireworks to produce a persistent intense red flame?

Correct Answer: B) Sr.

9. What is the main application of strontium compounds?

Correct Answer: C) Fireworks.

10. The formula of soda ash is

Correct Answer: D) Na$_{2}$CO$_{3}$.

11. Alkali and alkaline earth metals impart colours when heated over the burner. It is due to

Correct Answer: C) De-excitation of electrons from higher energy levels to low energy level.

12. What is the main use of sodium hydroxide?

Correct Answer: D) Neutralizing acids in waste water treatment.

13. Which s-block element has the highest hydration enthalpy?

Correct Answer: A) Cesium.

14. What is a characteristic property of s-block elements related to their electronegativity?

Correct Answer: B) Low electronegativity.

15. Which group of elements are known as Alkali metals?

Correct Answer: B) NaK.

16. Which of the following statements is true about Ca(OH)2?

Correct Answer: A) It is used in the preparation of bleaching powder.

17. What is the main product when s-block elements react with water?

Correct Answer: A) Metal hydroxide.

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