Chemistry (basic reactions) MCQs for LDC
Practice 20 free Chemistry (basic reactions) questions under Basic Science — Science & Tech.
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LDC — Basic Science — Chemistry (basic reactions)
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
Which of the following statements strictly defines the chemical process of 'Rusting'?
Question 2 of 20
Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): Some modern synthetic detergents are considered detrimental to the environment. Reason (R): Detergents synthesized with highly branched alkyl sulfate chains are non-biodegradable and cause water pollution. In the context of the above statements, which one of the following is correct?
Question 3 of 20
Match List-I (Metal) with List-II (Respective Ore) and select the correct answer using the codes given below: List-I a. Aluminum b. Iron c. Copper d. Zinc List-II 1. Calamine 2. Malachite 3. Siderite 4. Kaolinite
Question 4 of 20
Consider the following statements regarding the atomic concept of 'Isobars': I. They are atoms belonging to entirely different chemical elements. II. They possess completely different atomic numbers. III. They coincidentally share the exact same mass number. Which of the statements given above are definitively correct?
Question 5 of 20
The Sambhar Salt Lake, located in Rajasthan, produces a unique alkaline brine. Which of the following sodium compounds is naturally abundant in this brine?
Question 6 of 20
Why are compounds like Saccharin and Sucralose critical in modern dietary management?
Question 7 of 20
Which of the following chemical groups correctly identifies an Antioxidant?
Question 8 of 20
Which of the following compounds is chemically characterized as a complex sulfide ore containing both copper and iron?
Question 9 of 20
The scientific transition from a laboratory discovery of a chemical reaction to manufacturing the resulting product efficiently and safely in a massive factory relies on the principles of:
Question 10 of 20
What is the primary objective of creating a homogenous solid solution of a primary metal blended with secondary non-metals?
Question 11 of 20
Match List-I (Properties of Chemical Species) with List-II (Type of Species) and select the correct answer using the codes given below: List-I a. Turns red litmus paper blue b. Yields Hydroxyl ions (OH-) in aqueous solutions c. Furnishes Hydrogen ions (H+) in aqueous solutions d. Complete ionization in water List-II 1. General property of acids 2. Characteristic of strong acids 3. General property of bases 4. Arrhenius definition of a base
Question 12 of 20
Both biological cellular respiration and the rapid industrial burning of coal are strictly categorized as highly exothermic reactions. What fundamental thermodynamic characteristic universally unites them?
Question 13 of 20
Chemical reactions are not confined to laboratories; they fundamentally dictate everyday phenomena. Which of the following is cited as a prime everyday example of an intentional biochemical transformation triggered by chemical agents?
Question 14 of 20
Consider the following statements regarding synthetic food additives: I. Aspartame provides intense sweetness and is used for strict calorie control. II. Butylated Hydroxyanisole prevents oxidative rancidity in fats. III. Sodium Benzoate intercepts reactive oxygen free radicals in acidic foods. Which of the above statements are correct?
Question 15 of 20
Which of the following accurately describes the trend of Ionization Energy in the periodic table?
Question 16 of 20
Which of the following best explains the specific mechanism by which synthetic detergents retain immense cleansing efficacy even in heavily mineralized hard water?
Question 17 of 20
What is the correct chemical formula for the complex sulfide ore Chalcopyrite?
Question 18 of 20
The Sambhar Salt Lake, a major geographical hallmark of Rajasthan, produces an alkaline brine rich in various salts. Which of the following compounds is NOT explicitly mentioned as a component of this rich brine?
Question 19 of 20
Which of the following organic compounds is universally acknowledged as a standard industrial antioxidant?
Question 20 of 20