Unit 2: S-Block Elements

41. Which alkali metal is used in the manufacture of certain types of glass?

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

42. The s-block element that reacts with water to form a basic solution and hydrogen gas is:

a) Magnesium
b) Calcium
c) Sodium
d) Barium
Answer: c) Sodium

43. The most abundant alkali metal in Earth’s crust is:

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

44. The s-block element that forms a compound used in bleaching powder is:

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

45. The solubility of alkaline earth metal chlorides in water generally:

a) Increases down the group
b) Decreases down the group
c) Remains constant
d) Increases up the group
Answer: a) Increases down the group

46. Which s-block element is used in the production of hydrogen gas in laboratories?

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

47. The most reactive alkaline earth metal is:

a) Beryllium
b) Magnesium
c) Calcium
d) Barium
Answer: d) Barium

48. The s-block element that forms a white precipitate when treated with water is:

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

49. The flame color produced by burning potassium salts is:

a) Green
b) Red
c) Blue
d) Yellow
Answer: a) Green

50. The s-block element used in the manufacture of high-strength steel is:

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