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RRB ALP Chemistry Questions
Practise chemistry (science) for the RRB Assistant Loco Pilot 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.The chemical formula of common salt is:
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Answer: D — NaCl
Common salt is sodium chloride.
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Q2.What is the mass of 4 mol of carbon dioxide (CO₂)? (Molar mass 44 g/mol)
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Answer: A — 176 g
Mass = moles × molar mass = 4 × 44 g/mol = 176 g.
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Q3.Which bond is formed by the sharing of electrons?
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Answer: A — Covalent
Covalent bonds share electron pairs.
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Q4.What is the pH of a solution with [OH⁻] = 10⁻⁶ mol/L at 25 °C?
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Answer: C — 8
[OH⁻] = 10⁻⁶ → pOH = 6; pH = 14 − 6 = 8 (at 25 °C).
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Q5.Which gas is produced when zinc reacts with dilute hydrochloric acid?
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Answer: B — Hydrogen
Zn + 2HCl → ZnCl₂ + H₂.
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Q6.What is the pH of a solution with [OH⁻] = 10⁻² mol/L at 25 °C?
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Answer: D — 12
[OH⁻] = 10⁻² → pOH = 2; pH = 14 − 2 = 12 (at 25 °C).
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Q7.The main component of natural gas is:
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Answer: A — Methane
Methane (CH₄).
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Q8.4 g of HCl (molar mass 36.5) is dissolved to make 1000 mL of solution. Find the molarity.
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Answer: A — 0.11 M
Moles = 4/36.5 = 0.11; molarity = moles ÷ litres = 0.11 ÷ 1 = 0.11 M.
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Q9.A solution with pH 3 is:
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Answer: A — Acidic
pH below 7 is acidic.
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Q10.What is the mass of 1 mol of carbon dioxide (CO₂)? (Molar mass 44 g/mol)
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Answer: B — 44 g
Mass = moles × molar mass = 1 × 44 g/mol = 44 g.
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 ALP
RRB Assistant Loco Pilot Examination — conducted by Railway Recruitment Boards (RRB). Recruits Assistant Loco Pilots and technicians for Indian Railways.
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 ALP practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | 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 |
| Indian Polity, History & Geography | General awareness | Question bank |