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RAS — Chemistry (basic reactions) MCQs

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

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

RAS — Basic Science — Chemistry (basic reactions)

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

Which of the following organic compounds is universally acknowledged as a standard industrial antioxidant?

Question 2 of 20

Which of the following describes the most precise chemical definition of a Synthetic Detergent?

Question 3 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 4 of 20

Physical chemistry bridges classical physics with chemical reactions to explain exactly why and how quickly a reaction occurs. Which of the following represents one of the three core scientific pillars of physical chemistry?

Question 5 of 20

The fundamental principles that scientifically explain *why* a specific chemical reaction occurs primarily in terms of thermodynamic spontaneity, overall energy consumption, and energy release are governed exclusively by:

Question 6 of 20

Which of the following statements fundamentally distinguishes a 'Compound' from other forms of matter?

Question 7 of 20

Why do advanced synthetic detergents containing ionic sulfonate groups successfully fail to produce insoluble scum when utilized in highly mineralized hard water environments?

Question 8 of 20

Which specific chemical reaction occurs when Sodium carbonate is produced by heating Sodium Hydrogencarbonate (Baking Soda)?

Question 9 of 20

Match List-I (Rajasthan Mine/Location) with List-II (Extracted Ore) and select the correct code: List-I a. Khetri Belt (Jhunjhunu) b. Zawar Mines (Udaipur) List-II 1. Zinc Blende ($ZnS$) 2. Chalcopyrite ($CuFeS_2$)

Question 10 of 20

Which technique correctly defines 'Galvanization' used for preempting the rusting of iron?

Question 11 of 20

The study of chemistry is highly compartmentalized based on the nature of the elements involved. The study of pharmaceutical 'Drugs' and the study of metallurgical 'Alloys' strictly fall under which two branches, respectively?

Question 12 of 20

Which of the following processes strictly represents a physical change rather than a chemical reaction?

Question 13 of 20

Air and saltwater are considered 'Mixtures' rather than compounds because:

Question 14 of 20

To properly explain the ecological phenomenon of Acid Rain in a descriptive examination, a candidate must explicitly mention the atmospheric transformation of which two primary pollutant gases into strong acids?

Question 15 of 20

Consider the following statements regarding the metallurgical processing of copper in Rajasthan: 1. The rigorous extraction process in the Khetri Copper Belt involves concentrating the Chalcopyrite ore via the froth flotation method. 2. In a reverberatory furnace, roasting is performed in the strict absence of oxygen to prevent the formation of calcine. Which of the statements given above is/are correct?

Question 16 of 20

Synthetic detergents are scientifically engineered to entirely bypass the severe limitations of traditional soaps in hard water. What is their fundamental chemical identity?

Question 17 of 20

Which specific sub-discipline is fundamentally concerned with investigating the 'rates' at which reactants turn into products and the step-by-step 'mechanisms' they follow during the reaction?

Question 18 of 20

In the formulation of Aqua Regia, what is the exact consequence of utilizing Sulfuric Acid (H2SO4) instead of Hydrochloric Acid (HCl)?

Question 19 of 20

The substance scientifically referred to as 'dead burnt plaster' is chemically recognized as:

Question 20 of 20

According to the commonly used mnemonic 'Lina Na Ki Ruby Ce Friendship', which of the following sets of elements accurately represents the Alkali Metals of Group 1?

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