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RRB Group D Chemistry Questions
Practise chemistry (science) for the RRB Level 1 (Group D) Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Chemistry practice
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Q1.An oxidation reaction involves:
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Answer: A — Loss of electrons
Oxidation is loss of electrons (OIL RIG).
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Q2.What is the mass of 2.5 mol of water (H₂O)? (Molar mass 18 g/mol)
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Answer: A — 45 g
Mass = moles × molar mass = 2.5 × 18 g/mol = 45 g.
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Q3.Isotopes of an element have the same number of:
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Answer: A — Protons
Isotopes share the proton number but differ in neutrons.
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Q4.What is the pH of a solution with [H⁺] = 10⁻⁵ mol/L?
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Answer: A — 5
pH = −log[H⁺] = −log(10⁻⁵) = 5.
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Q5.Which of these is an alkali metal?
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Answer: C — Potassium
Potassium is in Group 1 (alkali metals).
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Q6.What is the pH of a solution with [H⁺] = 10⁻² mol/L?
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Answer: C — 2
pH = −log[H⁺] = −log(10⁻²) = 2.
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Q7.The hardest naturally occurring substance is:
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Answer: D — Diamond
Diamond, a carbon allotrope, is the hardest natural material.
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Q8.58.5 g of glucose (molar mass 180) is dissolved to make 1000 mL of solution. Find the molarity.
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Answer: A — 0.325 M
Moles = 58.5/180 = 0.325; molarity = moles ÷ litres = 0.325 ÷ 1 = 0.325 M.
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Q9.Which gas is produced when zinc reacts with dilute hydrochloric acid?
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Answer: A — Hydrogen
Zn + 2HCl → ZnCl₂ + H₂.
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Q10.8 g of glucose (molar mass 180) is dissolved to make 1000 mL of solution. Find the molarity.
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Answer: A — 0.044 M
Moles = 8/180 = 0.044; molarity = moles ÷ litres = 0.044 ÷ 1 = 0.044 M.
How to approach chemistry questions
Moles = mass ÷ molar mass; molarity = moles ÷ litres. pH = −log[H⁺] and pH + pOH = 14 at 25 °C. For concepts, link each property to its position in the periodic table.
About RRB Group D
RRB Level 1 (Group D) Examination — conducted by Railway Recruitment Boards (RRB). Recruits track maintainers, helpers and assistants; general science carries significant weight.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
RRB Group D practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Biology | Science | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |