(Antonyms) Part – B General Knowledge (Solved Paper 2024 – II) (101 to 150)

Total Questions: 50

11. Which one of the following is correct?

Correct Answer: (b) Amphiloles form about 20% of the Earth's crust
Solution:Amphiboles are primarily found in metamorphic and igneous rocks. They occur in many metamorphic rocks, especially those derived from mafic igneous rocks (which contain dark-colored ferromagnesian minerals) and siliceous dolomites.

Amphiboles are also important constituents of various plutonic and volcanic igneous rocks, ranging in composition from granitic to gabbroic. They form approximately 20% of the Earth's crust.

12. Which one among the following processes is NOT part of chemical weathering?

Correct Answer: (d) Reduction
Solution:Chemical weathering is the process in which rocks and minearals break down due to chemical reaction with water gases. Thawing is a type of physical weathering not chemical weathering.

13. What is the maximum number of electrons that can occupy the first shell of an atom?

Correct Answer: (a) 2
Solution:The general formula for the maximum number of electron in a shell is 2n², where n is the principal quantum number.
For the first shell of an atom n = 1
2n² = 2 × (1)² = 2

14. At which temperature does liquid water show maximum density?

Correct Answer: (b) 277 k
Solution:Liquid water show maximum density at 277 K because the water molecules are closest togther at this temperature. So, decrease in volume and increase in the density will be observed.

15. Which one among the following has valency of 3?

Correct Answer: (c) Nitrogen
Solution:Nitrogen atom needs to gain 3 electron in its outermost orbit to complete octet. So, nitrogen has, valency of 3.

16. Which one among the following is an example of oxidation reaction?

Correct Answer: (c) Rusting of iron
Solution:When iron is exposed to oxygen and water, it combines with oxygen forms a compound called iron oxide or rust. This process is an oxidation reaction.

17. Which one among the following fertilizers is a source of nitrogen?

Correct Answer: (d) Urea
Solution:Urea is a source of nitrogen act as fertilizer. Urea has high nitrogen content around 46%.

18. For Aluminium (Al) (atomic number :13, mass number : 27), which one among the following statement is NOT correct?

Correct Answer: (d) The valency of Al is 2
Solution:The valency of Al is 3.

19. The elemental composition of diamond is

Correct Answer: (c) Pure Carbon
Solution:The element composition of a diamond is 100% carbon or pure carbon.

20. Which one among the following is an example of chemical change?

Correct Answer: (d) Mixing of NaOH and HCl
Solution:Mixing of NaOH and HCl is an example of chemical change were a neutralization reaction occur, forming water and a salt.