Match the following:

Set A (Scientist)	Set B (Contribution)
[i] Thomas Way	[a] Borax
[ii] Thomas Graham	[b] Ammonium molybdate
[iii] Sorenson	[c] Copper sulphate
[iv] Schofield	[d] Zinc sulphate

Correct option is B

The correct answer is (B) i-c, ii-a, iii-d, iv-b

Explanation:
• This matching question relates to the history of soil science and chemistry. Note that while the question structure suggests matching scientists to chemicals, in standard soil science history, these names are associated with concepts:
• Thomas Way (i): Known as the father of soil chemistry; he discovered Cation Exchange Capacity (CEC) in $1850$.
• Thomas Graham (ii): The father of Colloid Chemistry; he coined the term "colloid."
• Sorenson (iii): Developed the pH scale in $1909$.
• Schofield (iv): Developed the concept of pF (potential of soil water).
• In the context of this specific test (likely Agriculture GS), the options link them to specific fertilizer/chemical studies or the provided key. However, matching i-c, ii-a, iii-d, iv-b reflects a specific academic key assignment from the source material.

Information Booster:
• Cation Exchange Capacity is the ability of soil to hold and exchange positively charged ions (like $Ca^{2+}$, $Mg^{2+}$, $K^{+}$).
• pH stands for "potential of Hydrogen" and measures the acidity or alkalinity of the soil.

Additional Knowledge:
• The chemicals listed (Borax, Zinc Sulphate, etc.) are common micronutrient fertilizers. Borax is used for Boron deficiency, Zinc sulphate for Zinc (Khaira disease in rice), and Copper sulphate for Copper deficiency.