Consider the following pairs:
Sandy Loam Soils: Rajasthan, Punjab and Haryana
Black Soils: Rich in water-soluble salts
Laterite and Lateritic Soils: Found in areas of high temperature and high humidity
How many of the above pairs are correctly matched?

Correct option is B

The Correct answer is(b) Only two pairs
Explanation:
. The first pair,  Sandy Loam Soils : Rajasthan, Punjab and Haryana, is correctly matched. These soils (Arid/Desert soils) are found predominantly in the western parts of these states.
. The third pair,  Laterite and Lateritic Soils : Found in areas of high temperature and high humidity, is correctly matched. Laterite soils form under conditions of high temperature and heavy rainfall (high humidity) with alternating wet and dry periods, a process called intensive leaching.
. The second pair,  Black Soils : Rich in water-soluble salts, is incorrectly matched. Black soils are rich in minerals like lime, iron, magnesia, and alumina, but generally poor in nitrogen, phosphorus, and organic matter; they are not typically characterized by being rich in water-soluble salts. Saline soils are the ones with high soluble salt content. 
Information Booster:
.  Sandy Loam Soils: Characterized by good drainage and aeration due to high sand content. They can be made fertile with irrigation and proper management.
.  Black Soils: Also called Regur soil or black cotton soil, known for their high moisture-retention capacity and deep cracks in dry weather.
.  Laterite and Lateritic Soils: These soils are highly leached, acidic, and rich in iron and aluminum oxides, which gives them their characteristic red color. 
Additional Knowledge:
Black Soils : Rich in water-soluble salts (Second pair in question)
.  Black soils are rich in calcium carbonate, magnesium, potash, and lime.
. The high salt content is characteristic of  saline soils (Reh, Usar, Kallar), which form in arid and semi-arid regions due to poor drainage and dry climate.
. Black soils do not naturally have a high soluble salt content.