Chemistry (basic reactions) MCQs for Rajasthan SI
Practice 20 free Chemistry (basic reactions) questions under Basic Science — Science & Tech.
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Rajasthan SI — Basic Science — Chemistry (basic reactions)
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
The total number of nucleons (protons plus neutrons) located in the nucleus constitutes which specific property of an atom?
Question 2 of 20
Which of the following chemical formulas strictly corresponds to the primary ore extracted at the geological site of Khetri?
Question 3 of 20
Match List-I (Periodic Trend) with List-II (Direction in Periodic Table) and select the correct answer: List-I A. Atomic Size increases B. Metallic Nature decreases C. Electronegativity decreases List-II 1. From top to bottom down a group 2. From left to right across a period
Question 4 of 20
In the highly characteristic displacement reaction where a solid iron nail is fully immersed in an aqueous copper sulfate solution, what essential chemical factor drives the reaction forward?
Question 5 of 20
Air and saltwater are considered 'Mixtures' rather than compounds because:
Question 6 of 20
Debari, a significant and well-known industrial location in Rajasthan, holds immense economic and chemical importance primarily due to its specialized metallurgical extraction and smelting of which specific metal?
Question 7 of 20
A student attempts to dissolve a sample of pure Gold (Au) using a mixture of concentrated Nitric acid and Hydrochloric acid. For the dissolution to occur successfully, the student must strictly adhere to which volumetric ratio of HCl to HNO3?
Question 8 of 20
During the artificial ripening of fruits, the acetylene gas generated acts as a synthetic analog for which natural biological hormone?
Question 9 of 20
At what specific temperature is the zinc blende ore roasted during its metallurgical extraction process?
Question 10 of 20
The production of Washing Soda from Baking Soda involves which two distinct chemical processes sequentially?
Question 11 of 20
Synthetic polymers, such as common plastics, polyvinyl chloride (PVC), and synthetic rubbers, are immensely important industrial materials. Since they are primarily composed of extremely long, repeating chains of carbon atoms, their foundational study strictly belongs to:
Question 12 of 20
What is the exact chemical identity of the useless 'scum' that vigorously forms when a traditional soap is mixed with hard water?
Question 13 of 20
When metal atoms participate in chemical reactions, they frequently shed electrons from their outermost shell to achieve stability. What is the resulting positively charged ion definitively called?
Question 14 of 20
Which of the following chemicals is widely utilized in the food industry to drastically inhibit the metabolic growth of destructive microorganisms specifically in acidic environments?
Question 15 of 20
Match List-I with List-II and select the correct answer using the codes given below: List-I (Specific Chemical) A. Butylated Hydroxytoluene B. Salts of sorbic acid C. Sucralose D. Sodium salts of sulfonic acids List-II (Classification) 1. Synthetic Detergent 2. Antioxidant 3. Artificial Sweetener 4. Food Preservative
Question 16 of 20
Assertion (A): Certain advanced teaching eligibility exams demand a much profounder conceptual understanding of chemistry compared to standard lower-level eligibility tests. Reason (R): Advanced exams focus on Class 11/12 standards like detailed organic reaction mechanisms, whereas baseline tests evaluate Class 10 NCERT concepts like simple balancing of equations.
Question 17 of 20
Which specific group in the periodic table is classically referred to as the 'Halogens' and includes highly reactive elements like Fluorine, Chlorine, and Bromine?
Question 18 of 20
Why is pure elemental iron frequently subjected to 'Galvanization' in industrial applications?
Question 19 of 20
Which of the following compounds represents rapid ignition and is defined as having a Cetane rating of 100?
Question 20 of 20