s-Block Element  NEET MCQ

1. Which of the following elements belongs to the s-block?

a) Carbon
b) Silicon
c) Sodium
d) Chlorine

Answer:

c) Sodium

Explanation:

Sodium is an alkali metal and belongs to the s-block.

2. Which alkaline earth metal is a major component of limestone?

a) Magnesium
b) Calcium
c) Barium
d) Strontium

Answer:

b) Calcium

Explanation:

Limestone primarily consists of calcium carbonate (CaCO3).

3. Which s-block metal is stored under kerosene?

a) Lithium
b) Potassium
c) Calcium
d) Beryllium

Answer:

b) Potassium

Explanation:

Potassium is highly reactive with air and water, so it's stored under kerosene to prevent reactions.

4. Which of the following is not a property of s-block elements?

a) Low ionization energy
b) Formation of colorless compounds
c) Low melting point
d) High electronegativity

Answer:

d) High electronegativity

Explanation:

s-block elements generally have low electronegativity.

5. Which gas is evolved when sodium reacts with water?

a) Oxygen
b) Hydrogen
c) Chlorine
d) Nitrogen

Answer:

b) Hydrogen

Explanation:

Sodium reacts with water to release hydrogen gas.

6. Which element of the s-block is the lightest metal?

a) Sodium
b) Lithium
c) Potassium
d) Magnesium

Answer:

b) Lithium

Explanation:

Among metals, lithium has the lowest density, making it the lightest metal.

7. The metal used in aircraft construction due to its light weight is:

a) Sodium
b) Potassium
c) Magnesium
d) Beryllium

Answer:

c) Magnesium

Explanation:

Magnesium has a favorable strength-to-weight ratio, making it suitable for aircraft construction.

8. Which metal is responsible for the red color in fireworks?

a) Sodium
b) Strontium
c) Potassium
d) Beryllium

Answer:

b) Strontium

Explanation:

Strontium salts produce a red flame, often used in fireworks.

9. Which alkali metal has the highest atomic weight?

a) Sodium
b) Lithium
c) Potassium
d) Cesium

Answer:

d) Cesium

Explanation:

Among the alkali metals, cesium has the highest atomic weight.

10. Which s-block element is not found free in nature due to its high reactivity?

a) Magnesium
b) Beryllium
c) Lithium
d) Barium

Answer:

d) Barium

Explanation:

Due to its high reactivity, barium is not found in a free state in nature.

11. Which metal is present in green plants and aids in the process of photosynthesis?

a) Sodium
b) Magnesium
c) Calcium
d) Potassium

Answer:

b) Magnesium

Explanation:

Magnesium is present in chlorophyll, the green pigment in plants responsible for photosynthesis.

12. Which s-block metal is used in photoelectric cells?

a) Sodium
b) Potassium
c) Cesium
d) Rubidium

Answer:

c) Cesium

Explanation:

Cesium is used in photoelectric cells due to its ability to emit electrons when exposed to light.

13. The s-block element with the lowest melting point is:

a) Sodium
b) Potassium
c) Lithium
d) Francium

Answer:

d) Francium

Explanation:

Among the known s-block elements, francium has the lowest melting point.

14. The alkaline earth metal that imparts a brick-red flame is:

a) Magnesium
b) Calcium
c) Barium
d) Strontium

Answer:

d) Strontium

Explanation:

Strontium salts impart a brick-red color to the flame.

15. Epsom salt is a salt of:

a) Sodium
b) Potassium
c) Magnesium
d) Calcium

Answer:

c) Magnesium

Explanation:

Epsom salt is magnesium sulfate (MgSO4·7H2O).

16. Which of the following elements has the highest metallic character?

a) Sodium
b) Potassium
c) Lithium
d) Francium

Answer:

d) Francium

Explanation:

Francium, being at the bottom of the alkali metal group, exhibits the highest metallic character.

17. Which alkaline earth metal is radioactive?

a) Magnesium
b) Calcium
c) Barium
d) Radium

Answer:

d) Radium

Explanation:

Radium is a radioactive alkaline earth metal.

18. The s-block element used as a neutron absorber in nuclear reactors is:

a) Sodium
b) Lithium
c) Beryllium
d) Magnesium

Answer:

b) Lithium

Explanation:

Lithium, especially in the form of lithium-6, is used as a neutron absorber in nuclear reactors.

19. The compound responsible for the hardening of water is a salt of:

a) Sodium
b) Magnesium
c) Calcium
d) Potassium

Answer:

c) Calcium

Explanation:

Calcium salts, like calcium carbonate, are responsible for the hardening of water.

20. The s-block metal that forms a superoxide when exposed to excess oxygen is:

a) Sodium
b) Potassium
c) Lithium
d) Rubidium

Answer:

b) Potassium

Explanation:

Potassium forms superoxide (KO2) when exposed to excess oxygen.

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