100+ Free UPMSP Intermediate Agricultural Chemistry Practice Questions

Prepare for the Uttar Pradesh UPMSP Intermediate (Class 12) Agricultural Chemistry — Code 172 exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More Uttar Pradesh UPMSP Intermediate (Class 12) Subjects

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

2026 Statistics

Key Facts: UPMSP Intermediate Agricultural Chemistry Exam

Class 12

Intermediate senior secondary agriculture stream level in Uttar Pradesh

UPMSP Education Board

Code 172

Official UPMSP Subject Code for Agricultural Chemistry (कृषि रसायन विज्ञान)

UPMSP Syllabus Directory

70 + 30

70 Marks Theory Paper and 30 Marks Practical Laboratory Assessment

UPMSP Exam Regulations

100

Verified practice questions provided in this study module

OpenExamPrep

Comprehensive 100-question practice bank for UP Board (UPMSP) Class 12 Agricultural Chemistry (Code 172), covering Soil Chemistry, Fertilisers, Soil Colloids, Humus, Insecticides, and Soil Reclamation with step-by-step verified explanations.

Sample UPMSP Intermediate Agricultural Chemistry Practice Questions

Try these sample questions to test your UPMSP Intermediate Agricultural Chemistry exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1How is soil pH mathematically defined in soil chemistry?

A.Negative logarithm (base 10) of hydrogen ion concentration: pH = -log[H+]

B.Positive logarithm of hydroxyl ion concentration: pH = log[OH-]

C.Ratio of calcium ions to sodium ions in soil solution

D.Total concentration of hydrogen ions expressed in grams per liter

Explanation: Soil pH is defined as the negative logarithm (base 10) of the active hydrogen ion concentration [H+] in the soil solution. It measures soil acidity or alkalinity on a scale from 0 to 14, where 7 is neutral.

2What is the primary difference between active acidity and reserve (potential) acidity in soils?

A.Active acidity is due to H+ ions free in soil solution, while reserve acidity is due to exchangeable H+ and Al3+ ions adsorbed on soil colloids

B.Active acidity is caused by organic matter, while reserve acidity is caused by mineral fertilizers

C.Active acidity is measured in dry soil, while reserve acidity is measured in saturated paste

D.Active acidity cannot be neutralized by lime, whereas reserve acidity is instantly neutralized

Explanation: Active acidity refers to the concentration of free H+ ions present in the soil solution at any given moment, which directly affects plant roots. Reserve (potential) acidity consists of exchangeable H+ and Al3+ ions adsorbed on the surfaces of soil clay and humus colloids, which buffer the soil solution.

3Which chemical compound constitutes agricultural limestone used most commonly for reclaiming acidic soils?

A.Calcium Carbonate (CaCO3)

B.Calcium Sulfate Dihydrate (CaSO4·2H2O)

C.Sodium Carbonate (Na2CO3)

D.Calcium Chloride (CaCl2)

Explanation: Agricultural limestone consists primarily of Calcium Carbonate (CaCO3). When applied to acidic soils, carbonate ions react with H+ ions to form carbonic acid, which decomposes into water and carbon dioxide, effectively neutralizing soil acidity.

4Which standard SI metric unit is used to express Electrical Conductivity (EC) when measuring soil salinity?

A.Decisiemens per meter (dS/m)

B.Milliequivalents per 100 grams (meq/100g)

C.Parts per million (ppm)

D.Centimoles of positive charge per kilogram (cmol(+)/kg)

Explanation: Electrical Conductivity (EC) of soil extracts is standardly expressed in decisiemens per meter (dS/m) at 25°C, which is numerically equivalent to millimhos per centimeter (mmhos/cm).

5What is the Calcium Carbonate Equivalent (CCE) of pure Quicklime (Calcium Oxide, CaO)?

A.179%

B.100%

C.135%

D.86%

Explanation: Calcium Carbonate Equivalent (CCE) is calculated as (Molecular Weight of CaCO3 / Molecular Weight of CaO) × 100 = (100.09 / 56.08) × 100 ≈ 178.5% (or 179%). This means 56 kg of CaO neutralizes as much acid as 100 kg of pure CaCO3.

6What chemical reaction takes place when Gypsum (CaSO4·2H2O) is incorporated into an alkali (sodic) soil?

A.Calcium ions replace exchangeable sodium on clay particles, forming soluble sodium sulfate that is leached out

B.Gypsum neutralizes active H+ ions by converting them into hydrogen sulfide gas

C.Sodium ions oxidize gypsum into soluble calcium nitrate

D.Gypsum precipitates silica to form insoluble sodium silicate complexes

Explanation: In sodic soil reclamation, calcium ions (Ca2+) supplied by gypsum replace exchangeable sodium ions (Na+) on the soil colloid surface: 2Na+-Clay + CaSO4 → Ca2+-Clay + Na2SO4. The resulting soluble sodium sulfate (Na2SO4) is then leached down beyond the root zone with good quality irrigation water.

7What is meant by the buffer capacity of a soil?

A.The ability of a soil to resist drastic changes in its pH when acids or bases are added

B.The maximum volume of water a soil can hold against gravity

C.The rate at which mineral nitrogen is converted into organic protein

D.The total weight of crop residues that can decompose in one season

Explanation: Soil buffer capacity is the resistance of a soil to changes in pH upon the addition of acidic or basic substances. It depends primarily on the soil's cation exchange capacity (CEC), clay content, organic matter, and carbonate balance.

8Which combination of diagnostic parameters defines a typical Saline Soil according to the US Salinity Laboratory classification?

A.EC > 4.0 dS/m, ESP < 15%, and pH < 8.5

B.EC < 4.0 dS/m, ESP > 15%, and pH > 8.5

C.EC > 4.0 dS/m, ESP > 15%, and pH > 8.5

D.EC < 2.0 dS/m, ESP < 5%, and pH = 7.0

Explanation: Saline soils contain excess soluble neutral salts (chloride and sulfate of Ca, Mg, Na). They are defined by Electrical Conductivity (EC) > 4.0 dS/m, Exchangeable Sodium Percentage (ESP) < 15%, and a soil solution pH < 8.5 (usually near neutral).

9What causes the extremely low pH (pH < 4.0) observed in Acid Sulfate Soils (Cat Clays)?

A.Oxidation of iron pyrite (FeS2) to sulfuric acid upon drainage and exposure to air

B.Accumulation of excess ammonium nitrate fertilizer in flooded conditions

C.Hydrolysis of sodium carbonate producing concentrated carbonic acid

D.Precipitation of insoluble calcium phosphate complexes

Explanation: Acid sulfate soils develop in coastal sediments containing iron pyrite (FeS2). When drained or exposed to oxygen, Thiobacillus bacteria oxidize FeS2 into iron sulfate and free sulfuric acid (H2SO4), dropping soil pH below 3.5 to 4.0.

10How is the Base Saturation Percentage (BS%) of a soil calculated?

A.(Sum of Exchangeable Bases [Ca2+ + Mg2+ + K+ + Na+] / Total Cation Exchange Capacity [CEC]) × 100

B.(Exchangeable Na+ / Total CEC) × 100

C.(Exchangeable H+ + Al3+ / Exchangeable Ca2+) × 100

D.(Active H+ ion concentration / Solution Volume) × 100

Explanation: Base Saturation Percentage (BS%) expresses the proportion of the soil's total cation exchange sites occupied by basic cations (Ca2+, Mg2+, K+, Na+). The formula is BS% = (Sum of Exchangeable Bases / CEC) × 100.

About the UPMSP Intermediate Agricultural Chemistry Exam

The Uttar Pradesh UPMSP Intermediate (Class 12) Agricultural Chemistry (Code 172 / कृषि रसायन विज्ञान) examination tests students on fundamental principles of soil chemistry, essential plant nutrition, fertilizer and manure formulations, soil colloid structures, ion exchange phenomena, organic matter humification, pesticide chemistry and formulations, as well as irrigation water quality standards and saline-sodic soil reclamation. This practice bank provides 100 verified questions with complete scientific explanations.

Assessment

Question count not published by the exam provider

Time Limit

3 Hours 15 Minutes (195 Minutes)

Passing Score

33% aggregate passing standard

Exam Fee

₹600.75 for institutional (regular) Intermediate candidates, including the Agriculture Part-2 stream, and ₹806 for private candidates for the 2026 examination. UPMSP charges one registration fee per candidate, not per subject paper. (Uttar Pradesh Madhyamik Shiksha Parishad (UPMSP))

UPMSP Intermediate Agricultural Chemistry Exam Content Outline

20%

Soil Chemistry, Soil pH & Acidity/Alkalinity

Fundamental concept of soil pH ($pH = -\log[H^+]$), active vs potential acidity, liming reactions with $CaCO_3$, dolomite, $CaO$, Calcium Carbonate Equivalent (CCE), buffering mechanisms, and characteristics of saline, sodic, and acid sulfate soils.

25%

Essential Plant Nutrients, Fertilisers & Manures

Arnon and Stout essentiality criteria, classification into macro (N, P, K, Ca, Mg, S) and micronutrients (Fe, Mn, Zn, Cu, B, Mo, Cl, Ni), characteristic deficiency symptoms, fertilizer chemistry (Urea, SSP, DAP, MOP, CAN), FYM, vermicompost, and soil biological nitrogen transformations.

20%

Soil Colloids, Silicate Clays & Ion Exchange

Physicochemical properties of soil colloids, silica tetrahedral and alumina octahedral sheets, classification into 1:1 (Kaolinite), 2:1 expanding (Montmorillonite), 2:1 non-expanding (Illite), and 2:1:1 (Chlorite) clays, isomorphous substitution, permanent and pH-dependent charge, CEC, AEC, and lyotropic exchange series.

15%

Soil Organic Matter & Humus Chemistry

Plant residue composition, decomposition hierarchy (sugars > cellulose > lignin), humification processes, humus fractionation (fulvic acid, humic acid, humin), C:N ratio dynamics, N immobilization vs mineralization thresholds, and Van Bemmelen organic matter factor (1.724).

12%

Pesticides, Insecticides & Fungicides Chemistry

Chemical classification of pesticides, modes of action of organochlorines, organophosphates (AChE inhibition), carbamates, synthetic pyrethroids, inorganic fungicides (Bordeaux mixture, sulphur), systemic fungicides (Carbendazim), formulation codes (EC, WP, GR), and container hazard color codes (LD50 limits).

Irrigation Water Quality & Soil Reclamation

Assessment of irrigation water quality parameters: Electrical Conductivity (EC), Sodium Adsorption Ratio (SAR), Residual Sodium Carbonate (RSC), boron toxicity thresholds, chemical reclamation of sodic soils using gypsum ($CaSO_4 \cdot 2H_2O$) and pyrite ($FeS_2$), and leaching requirement equations.

How to Pass the UPMSP Intermediate Agricultural Chemistry Exam

What You Need to Know

Passing score: 33% aggregate passing standard
Assessment: Question count not published by the exam provider
Time limit: 3 Hours 15 Minutes (195 Minutes)
Exam fee: ₹600.75 for institutional (regular) Intermediate candidates, including the Agriculture Part-2 stream, and ₹806 for private candidates for the 2026 examination. UPMSP charges one registration fee per candidate, not per subject paper.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

UPMSP Intermediate Agricultural Chemistry Study Tips from Top Performers

1Memorize exact nutrient percentages in major commercial fertilizers (e.g., Urea = 46% N, SSP = 16% P2O5, DAP = 18% N & 46% P2O5, MOP = 60% K2O).

2Understand the structural differences between 1:1 clay (Kaolinite), 2:1 expanding clay (Montmorillonite), and 2:1 non-expanding clay (Illite), along with their typical CEC ranges.

3Practice formulas for Sodium Adsorption Ratio (SAR), Residual Sodium Carbonate (RSC), and Calcium Carbonate Equivalent (CCE) to solve calculation-based board questions easily.

4Learn specific deficiency symptoms of plant nutrients (e.g., Khaira disease of rice due to Zn deficiency, Whip tail of cauliflower due to Mo deficiency, tip burn of older leaves due to K deficiency).

5Revise pesticide modes of action, Bordeaux mixture preparation ratios, and toxicity label colors according to LD50 values.

Frequently Asked Questions

What is the UPMSP Class 12 Agricultural Chemistry Code 172 exam?

It is a specialized subject examination conducted by Uttar Pradesh Madhyamik Shiksha Parishad (UPMSP) for Intermediate Class 12 students enrolled in the Agricultural stream (Krishi Rasayan Vigyan).

What is the mark distribution for UPMSP Class 12 Agricultural Chemistry?

The examination comprises 100 total marks, divided into a 70-mark written theory paper and a 30-mark practical examination covering soil testing, fertilizer analysis, volumetric analysis, and viva-voce.

Which main topics are covered in the UPMSP Agricultural Chemistry syllabus?

The syllabus covers Soil Chemistry & pH, Essential Plant Nutrients & Fertilisers, Soil Colloids & Ion Exchange, Soil Organic Matter & Humus, Pesticides & Insecticides Chemistry, and Irrigation Water Quality & Soil Reclamation.

How do practice questions help in UP Board Class 12 Agricultural Chemistry revision?

Practicing objective questions helps master critical chemical formulas, nutrient percentage content, clay mineral structures, CEC values, fertilizer reactions, and soil reclamation equations needed for top marks in board exams.

Are these questions officially published by UPMSP?

No. These 100 practice questions are original educational practice materials developed by OpenExamPrep to strictly align with the official UPMSP Class 12 Agricultural Chemistry (Code 172) curriculum.

100+ Free UPMSP Intermediate Agricultural Chemistry Practice Questions

Explore More Uttar Pradesh UPMSP Intermediate (Class 12) Subjects

UPMSP Intermediate Accountancy

UPMSP Intermediate Accountancy and Auditing — Vocational

UPMSP Intermediate Agricultural Economics

UPMSP Intermediate Agricultural Zoology

UPMSP Intermediate Agronomy

UPMSP Intermediate Animal Husbandry