1. Which of the following is NOT an s-block element?
Answer:
Explanation:
Carbon is a p-block element.
2. Which element is known as the lightest metal?
Answer:
Explanation:
Lithium, with an atomic number of 3, is the lightest metal.
3. Which s-block element is stored under kerosene to prevent reaction with moisture?
Answer:
Explanation:
Sodium reacts vigorously with moisture; hence it is stored under kerosene.
4. The metal used in the process of Vulcanization of rubber is:
Answer:
Explanation:
Vulcanization of rubber involves the addition of sulphur.
5. Which of the following elements does not impart color to the flame?
Answer:
Explanation:
Beryllium does not impart any color to the flame.
6. Which of the following metals is found in nature in free state?
Answer:
Explanation:
Gold is found in a free state in nature due to its low reactivity.
7. Which element when added to water produces a hissing sound?
Answer:
Explanation:
Lithium reacts with water and produces a hissing sound.
8. Which of the following is an alkaline earth metal?
Answer:
Explanation:
Barium is an alkaline earth metal and belongs to group 2 of the periodic table.
9. The metal which provides the necessary calcium for plant growth is:
Answer:
Explanation:
Gypsum, or CaSO4.2H2O, provides necessary calcium for plant growth.
10. Which of the following alkali metals has the lowest melting point?
Answer:
Explanation:
Cesium has the lowest melting point among alkali metals.
11. Which element is responsible for the red color in fireworks?
Answer:
Explanation:
Strontium salts give a red flame.
12. The most reactive among the following alkali metals is:
Answer:
Explanation:
Cesium is the most reactive among the given alkali metals.
13. Epsom salt is chemically:
Answer:
Explanation:
Epsom salt is magnesium sulfate heptahydrate.
14. Which s-block element is found abundant in Earth's crust?
Answer:
Explanation:
Calcium is the fifth most abundant element in Earth's crust.
15. Bauxite is an ore of:
Answer:
Explanation:
Bauxite is primarily a source of aluminium.
16. Which element is known as 'Wood's metal'?
Answer:
Explanation:
Wood's metal is an alloy, and one of its components is bismuth.
17. Milk of magnesia, used as an antacid, is:
Answer:
Explanation:
Milk of magnesia is magnesium hydroxide.
18. The element predominantly responsible for maintaining the pH of blood is:
Answer:
Explanation:
Bicarbonates act as buffers and help in maintaining the pH of the blood.
19. The substance known as 'slaked lime' is:
Answer:
Explanation:
Slaked lime is calcium hydroxide.
20. Which of the following metals float on water?
Answer:
Explanation:
Due to its low density and high reactivity with water, sodium floats on water.