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Chemistry (Part-IX) (Railway)

📆 April 14, 2025

Total Questions: 50

1. Which of the following is a correct nomenclature of the given structure? [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II]

CH₃CH₂OH

Correct Answer: (1) Ethan-1-ol
Solution:

The molecular formula of Ethanol is C₂H₆O or CH₃CH₂OH.

• Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.

• It is a primary alcohol, an alkyl alcohol, a volatile organic compound, and a member of ethanols.

2. What is the pH of a neutral solution? [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II)]

Correct Answer: (4) 7
Solution:

The pH scale measures how acidic or basic a substance is.

• The total pH scale ranges from 1 to 14, with 7 considered to be neutral.

• A pH less than 7 is said to be acidic and solutions with a pH greater than 7 are basic or alkaline.

3. In a hom In a homologous series, which element is replaced by any functional group?ologous series, which element is replaced by any functional group? [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II)]

Correct Answer: (1) Hydrogen
Solution:

Homologous series is a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain.

• The chemical properties of the compounds are very similar.

• Example of a homologous series: CH₃OH, C₂H₅OH, C₃H₇OH, C₄H₉OH.

4. Newlands arranged the elements into the periodic table on the basis of ________. [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II)]

Correct Answer: (4) increasing atomic mass
Solution:In the year 1866, Newlands arranged the elements in an increasing order of their atomic masses.
• It started with the lightest element hydrogen and ended up with thorium.
• He found that every eighth element had properties similar to those of the first.

5. Which substance formed precipitates when a reaction occurs between potassium sulfate and barium chloride? [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II)]

Correct Answer: (1) Barium sulfate
Solution:Barium chloride reacts with Potassium sulphate to form barium sulphate and potassium chloride.
• The chemical reaction involves a double displacement reaction in which water-insoluble barium sulfate precipitates out of the solution as a solid.
• BaCl₂(aq) + K₂SO₄(aq) → BaSO₄(s) + 2KCl(aq)

6. According to the Newland's law of octaves, how many elements are present in between Potassium and copper? [RRB Group 'D' CBT Exam, 28.09.2022 (Shift-II)]

Correct Answer: (4) 7
Solution:Newlands law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses.

7. Which of the following is NOT a crystalline allotrope of carbon? [RRB Group 'D' CBT Exam, 29.09.2022 (Shift-III)]

Correct Answer: (3) Coke
Solution:Diamond, graphite, graphene, and fullerene are crystalline allotropes of carbon.

• Coke, coal, lamp black, gas, etc., are amorphous allotropes of carbon.
• Amorphous compounds are compounds that have no ordered manner of arrangement of atoms.

8. The formation of zinc ion from zinc is due to: [RRB Group 'D' CBT Exam, 29.09.2022 (Shift-III)]

Correct Answer: (3) oxidation
Solution:The terms oxidation and reduction can be defined in terms of the adding or removing oxygen to an element or compound.
• Oxidation is the gain of oxygen; Reduction is the loss of oxygen.
• For example, Zinc Oxide (ZnO) is formed when one atom of zinc and one atom of oxygen combine.

9. pH paper shows light blue colour when dipped into milk of magnesia. This indicates that milk of magnesia is: [RRB Group 'D' CBT Exam, 29.09.2022) (Shift-III)]

Correct Answer: (4) a mild base
Solution:Litmus paper turns red if it is acidic and blue if it is alkaline, or basic.
• It is red when the pH is less than 4.5 and blue when the pH is greater than 8.3.
• Milk of magnesia is slightly less alkaline, with a pH level of around 10.5.
• So, when pH paper is dipped into it, it turns light blue.

10. Which of the following statements is/are INCORRECT? [RRB Group 'D' CBT Exam, 29.09.2022 (Shift-III)]

(A) Oxides of metals are basic and that of non-metals are acidic in nature.
(B) Oxides of metals are acidic and that of non-metals are basic in nature.
(C) Non-metals are electronegative in nature while metals are electropositive in nature.

Correct Answer: (2) Both A and B
Solution:Metallic oxides are basic in nature because they react with dilute acids to form salt and water. Hence, Statement I is correct.
• Non-metallic oxides are acidic in nature since they react with water to form metal hydroxides which are alkaline in nature. Hence, Statement II is also correct.
• Non-metals are generally electronegative in nature because these metal hydroxides release OH⁻ ions in solution. Hence, Statement III is incorrect.
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