Free Industrial Chemistry MCQs with Answers

• A. Cellulose
• B. Starch
• C. Lime
• D. Gypsum salt

Explanation: D is correct because gypsum salt (calcium sulfate) is commonly used as a filler or additive in paper making to improve the paper's…

• A. Root
• B. Leave
• C. Stem
• D. Seed

Explanation: Phosphorus is particularly vital for seed development, as it is involved in energy transfer, DNA synthesis, and cell division, all crucial…

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: A typical rotary kiln is divided into four zones: the drying zone, the preheating zone, the calcining zone, and the cooling zone.

• A. Nitrogen
• B. Carbon
• C. Phosphorus
• D. Potassium

Explanation: Nitrogen is a common element in fertilizers because it is essential for plant growth and is often a limiting nutrient in soil.

• A. 35%
• B. 46%
• C. 82%
• D. 75%

Explanation: Urea, a common nitrogen fertilizer, contains approximately 46% nitrogen by weight.

• A. CaH3PO4
• B. Ca(H2PO4)2
• C. Ca3(PO4)2
• D. CaHPO4

Explanation: Ca3(PO4)2, is correct because it represents the chemical formula for rock phosphate, which is a naturally occurring mineral consisting…

• A. Manure
• B. Amonium nitrate
• C. Urea
• D. Both (a) and (c)

Explanation: D is correct because both options (a) and (c) are organic fertilizers.

• A. CaH3PO4
• B. (NH4)2HPO4
• C. Ca3(PO4)2
• D. P2O5

Explanation: Calcium phosphate is a naturally occurring mineral that is not directly usable as a phosphatic fertilizer.

• A. D-H Whore
• B. Humphry Davy
• C. Joseph Aspdin
• D. F. Wöhler

Explanation: Calcium phosphate is a naturally occurring mineral that is not directly usable as a phosphatic fertilizer.

• A. 1 - 2%
• B. 2 - 3%
• C. 3- 4%
• D. 4 - 5%

Explanation: 2-3% is the correct range for the amount of gypsum typically added to cement.

• A. 2
• B. 2.5
• C. 3.0
• D. 3.5

Explanation: This is the correct RPM value, which ensures optimal rotation of the digestor for efficient cement manufacture.

• A. N, S, P
• B. N, Ca, P
• C. N, P, K
• D. N, K, C

Explanation: Option C (N, P, K) is correct because it includes nitrogen, phosphorus, and potassium, which are essential nutrients for healthy plant…

• A. To fight against diseases
• B. To produce fat
• C. To undergo photosynthesis
• D. To produce protein

Explanation: Nitrogen is a key component of amino acids, which are the building blocks of proteins.

• A. Root
• B. Leave
• C. Stem
• D. Seed

Explanation: Phosphorus plays a critical role in seed development and maturation. It is involved in processes such as energy transfer, DNA synthesis…

• A. 4-40 g
• B. 6-200 g
• C. 6-200 kg
• D. 4-40 kg

Explanation: Micronutrients are essential for plant growth and development, albeit in smaller quantities compared to macronutrients.

• A. 600°C
• B. 800°C
• C. 1000°C
• D. 1200°C

Explanation: 800°C is the correct temperature range for the decomposition zone in cement manufacturing.

• A. Rose
• B. Sunflower
• C. Papyrus
• D. Water hyacinth

Explanation: The word "paper" is derived from the name of the papyrus plant. Papyrus is a reedy plant that was historically used by ancient Egyptians…

• A. Lime
• B. Clay
• C. Marble
• D. Marine shell

Explanation: Clay is not a calcareous material. It is composed of fine-grained minerals, mainly aluminum silicates, and does not contain significant…

• A. Cotton
• B. Wheat
• C. Sugarcane
• D. Paddy rice

Explanation: Paddy rice cultivation typically involves flooded or waterlogged conditions, which are not suitable for ammonium nitrate fertilizer.

• A. It is mixed salt
• B. It has 35- 40 % available chlorine
• C. It acts as an oxidizing agent
• D. It acts as a reducing agent

Explanation: Bleaching powder (calcium hypochlorite, Ca(ClO)2) is a compound commonly used for bleaching, disinfection, and water treatment.