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LDC — Chemistry (basic reactions) MCQs

Practice 20 free chemistry (basic reactions) multiple choice questions for LDC exam. Instant answers with explanations in Hindi and English.

Master Chemistry (basic reactions) under Basic Science for LDC with our curated MCQ set. Every question follows real Rajasthan exam patterns. Switch between Hindi and English anytime.

LDC — Basic Science — Chemistry (basic reactions)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

Which specific architectural monument was historically constructed using Makrana marble primarily due to the stone's 95-98% Calcium Carbonate purity and resistance to environmental degradation?

Question 2 of 20

Why are traditional soaps rendered highly ineffective when used in hard water environments?

Question 3 of 20

Which of the following describes the fundamental mechanism of a buffer solution?

Question 4 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 5 of 20

The decomposition of stable crystalline limestone into structurally simpler substances is typically achieved by aggressively supplying which exact form of external energy?

Question 6 of 20

Which of the following compounds is explicitly classified as a weak base due to its partial ionization in water?

Question 7 of 20

In the rigorous study of physical chemistry, what specific term is used for the exact amount of thermal energy absorbed or released by a substance during a complete change in its physical phase, occurring at a constant temperature?

Question 8 of 20

Consider the following chemicals: 1. Saccharin 2. Aspartame 3. Sucralose 4. Butylated Hydroxytoluene Which of the above are classified strictly as artificial sweeteners?

Question 9 of 20

How is Washing Soda obtained from Sodium Carbonate (Na2CO3) produced by heating baking soda?

Question 10 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 11 of 20

The chemical formula and practical applications of everyday salts are classified as high-frequency factual applied chemistry. Which specific competitive examination explicitly prioritizes this specific level of applied chemical knowledge?

Question 12 of 20

Consider the chemical reaction: ZnO + C → Zn + CO. Which of the following statements is accurate regarding this reaction?

Question 13 of 20

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): Soaps are deemed highly eco-friendly compared to heavily branched synthetic detergents. Reason (R): Soaps are derived from carboxylic acids, making them highly biodegradable in natural environments. In the context of the above statements, which one of the following is correct?

Question 14 of 20

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): Soap becomes ineffective for cleaning when used in hard water. Reason (R): Soap reacts with minerals in hard water to form soluble salts that wash away easily. In the context of the above two statements, which one of the following is correct?

Question 15 of 20

The Octane and Cetane fuel rating scales are tailored for fundamentally different types of internal combustion engines. How do the ignition mechanisms of these engines dictate their specific fuel requirements?

Question 16 of 20

Why does electronegativity substantially decrease as you move down a given group in the periodic table?

Question 17 of 20

Which specific chemical compound serves as the baseline for poor ignition quality in diesel engines, representing severe ignition delay, and is consequentially assigned a Cetane rating of 0?

Question 18 of 20

The highly corrosive chemical mixture known as 'Aqua Regia', capable of dissolving noble metals, is formulated using specific concentrated acids. What is its exact volumetric composition?

Question 19 of 20

Which specific branch of chemistry relies fundamentally on the principles of thermodynamics, chemical kinetics, and quantum mechanics to explain the energy dynamics of why and how a reaction occurs?

Question 20 of 20

Scientific roles, such as those of a Laboratory Assistant, require a specialized and precise skill set that goes beyond theoretical knowledge. Which of the following areas is uniquely critical for such specialized scientific evaluations?

More Basic Science Subtopics

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