Q1 RRB JE CBT-1, 18 Dec 2024, Shift 3 (4:30 PM) In a displacement reaction, if a more reactive metal displaces a less reactive metal from its salt solution, what is the result?
A The less reactive metal is displaced and the more reactive metal becomes a part of the compound B The less reactive metal is displaced and solidifies C The more reactive metal remains unchanged D Formation of an insoluble salt Show answer Hide answer Correct answer: (D) Formation of an insoluble salt
Official answer key: (4) Formation of an insoluble salt
Correct answer should be (1). In a displacement reaction the more reactive metal displaces the less reactive metal from its salt solution and itself forms the compound (e.g. Fe + CuSO₄ → FeSO₄ + Cu). Forming an insoluble salt is not the result of a displacement reaction.
Scoring follows the official key.
Q2 RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM) Mahatma Gandhi started his famous 'Salt march' accompanied by _________ of his trusted volunteers.
A 51 B 94 C 39 D 78 Show answer Hide answer Q3 RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM) Which reactants are used to prepare bleaching powder?
A Lime and sulphuric acid B Calcium hydroxide and hydrochloric acid C Chlorine gas and dry calcium hydroxide D Chlorine and water Show answer Hide answer Correct answer: (C) Chlorine gas and dry calcium hydroxide
Q4 RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM) The product of the reaction between ethanol and acetic acid is:
A acetate B ester C methanol D ethanal Show answer Hide answer Correct answer: (B) ester
Q5 RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM) When a solution contains an equal number of H⁺ and OH⁻ ions, then the pH of the solution is:
A pH > 12 B pH < 3 C pH > 3 but < 5 D pH = 7 Show answer Hide answer Correct answer: (D) pH = 7
Q6 RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM) People having acidity problems are treated with antacids that contain which of the following?
A Lime water B Milk of magnesia C Hydrochloric acid D Quick lime Show answer Hide answer Correct answer: (B) Milk of magnesia
Q7 RRB JE CBT-1, 18 Dec 2024, Shift 1 (9:00 AM) If a substance has a pH of 11, which of the following statements is true?
A It is neutral and does not change the litmus colour. B It is basic and can turn red litmus paper blue. C It is acidic and can turn blue litmus paper red. D It is acidic and does not change the colour of the litmus paper. Show answer Hide answer Correct answer: (B) It is basic and can turn red litmus paper blue.
Q8 RRB JE CBT-1, 18 Dec 2024, Shift 1 (9:00 AM) A solution has a pH of 12. Which ion concentration is higher in this solution?
A Both H⁺and OH⁻ are equal B More number S²⁻ ions and more Cl⁻¹ C Only OH⁻ D Only H⁺ Show answer Hide answer Correct answer: (C) Only OH⁻
Q9 RRB JE CBT-1, 18 Dec 2024, Shift 1 (9:00 AM) Why is monitoring pH crucial for understanding the impacts of acid rain on soil and water ecosystems?
A Acid rain only makes the water taste sour. B Acid rain does not affect soil and water ecosystems. C Acid rain decreases the pH, harming aquatic life and soil nutrient availability. D Acid rain increases the pH of soil and water bodies. Show answer Hide answer Correct answer: (C) Acid rain decreases the pH, harming aquatic life and soil nutrient availability.
Q10 RRB JE CBT-1, 17 Dec 2024, Shift 3 (4:30 PM) What happens when zinc (Zn) reacts with hydrochloric acid (HCl)?
A Both Zinc and Hydrogen are oxidised. B Zinc is reduced. C Zinc is oxidised. D Hydrogen is oxidised. Show answer Hide answer Correct answer: (C) Zinc is oxidised.
Q11 RRB JE CBT-1, 17 Dec 2024, Shift 3 (4:30 PM) The pH of acid rain is:
A more than 7 B more than 5.6 but less than 7 C less than 5.6 D equal to 7 Show answer Hide answer Correct answer: (C) less than 5.6
Q12 RRB JE CBT-1, 17 Dec 2024, Shift 3 (4:30 PM) As the concentration of hydronium ions increases, the pH value _______.
A increases B decreases C decreases and then increases D remains the same Show answer Hide answer Correct answer: (B) decreases
Q13 RRB JE CBT-1, 17 Dec 2024, Shift 2 (12:45 PM) When the pH of rainwater falls below 5.6, it is commonly referred to as:
A acid rain B alkaline rain C hard water D mineral rain Show answer Hide answer Correct answer: (A) acid rain
Q14 RRB JE CBT-1, 17 Dec 2024, Shift 2 (12:45 PM) What is the result when sodium chloride and silver nitrate are mixed in a double displacement reaction?
A Formation of a salt B Formation of water C Formation of a precipitate D Formation of a gas Show answer Hide answer Correct answer: (C) Formation of a precipitate
Q15 RRB JE CBT-1, 17 Dec 2024, Shift 2 (12:45 PM) What is the pH of a solution containing significant concentrations of H⁺ ions?
A 7 B Greater than 7 C Less than 7 D Cannot be determined Show answer Hide answer Correct answer: (C) Less than 7
Q16 RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM) Which of the following statements is true about the pH of a neutral solution at 25°C?
A The pH is greater than 7. B The pH is not equal to 7. C The pH is less than 7. D The pH is equal to 7. Show answer Hide answer Correct answer: (D) The pH is equal to 7.
Q17 RRB JE CBT-1, 16 Dec 2024, Shift 2 (12:45 PM) What is the pH value of pure water at 25°C?
A 3 B 7 C 5 D 1 Show answer Hide answer Q18 RRB JE CBT-1, 16 Dec 2024, Shift 1 (9:00 AM) What is the process by which sodium hydroxide is prepared?
A Solvay’s process B Chlor-alkali process C Haber’s process D Contact process Show answer Hide answer Correct answer: (B) Chlor-alkali process
Q19 RRB JE CBT-1, 16 Dec 2024, Shift 1 (9:00 AM) The dark blue colour in the pH scale refers to __________.
A strong acidic solution B weak basic solution C neutral solution D strong basic solution Show answer Hide answer Correct answer: (B) weak basic solution
Q20 RRB JE CBT-1, 16 Dec 2024, Shift 1 (9:00 AM) Which of the following is the product of the neutralisation of hydrochloric acid (HCl) with sodium hydroxide (NaOH)?
A Sodium hydroxide and hydrochloric acid B Sodium chloride and water C Sodium chloride and hydrogen gas D Sodium hydroxide and water Show answer Hide answer Correct answer: (B) Sodium chloride and water
Q21 RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM) Which of the following everyday mixtures is best classified as a suspension?
A Salt solution prepared in water B Sugar completely dissolved in water C Copper sulphate dissolved in water D Chalk powder mixed with water Show answer Hide answer Correct answer: (D) Chalk powder mixed with water
Q22 RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM) When dilute hydrochloric acid reacts with calcium carbonate, the gas evolved is passed
through limewater. On passing the gas in excess, the milkiness disappears due to the
formation of:
A Calcium oxide B Calcium hydrogen carbonate C Calcium carbonate D Calcium hydroxide Show answer Hide answer Correct answer: (B) Calcium hydrogen carbonate
Q23 RRB JE CBT-1, 20 Feb 2026, Shift 3 (4:30 PM) Identify the CORRECT statement about the chlor-alkali process:
A It is used for the preparation of Na2CO3 solution by electrolysis of brine. B Hydrogen gas is formed at the cathode and chlorine gas at the anode. C Sodium hydroxide is generated near the anode during electrolysis. D NaOH is formed at the anode and chlorine gas at the cathode. Show answer Hide answer Correct answer: (B) Hydrogen gas is formed at the cathode and chlorine gas at the anode.
Q24 RRB JE CBT-1, 20 Feb 2026, Shift 3 (4:30 PM) Which pair of olfactory indicators loses its smell in a basic solution?
A Vanilla essence and clove oil B Onion and blue litmus C Turmeric and onion D Phenolphthalein and onion Show answer Hide answer Correct answer: (A) Vanilla essence and clove oil
Q25 RRB JE CBT-1, 20 Feb 2026, Shift 1 (9:00 AM) Which metal listed below shows the strongest reaction when added to dilute
hydrochloric acid?
A Magnesium B Iron C Zinc D Copper Show answer Hide answer Correct answer: (A) Magnesium
Q26 RRB JE CBT-1, 19 Feb 2026, Shift 3 (4:30 PM) Baking soda (NaHCO3) is commonly used in cooking. Which of the following statements
about it is correct?
A It is a strong base that turns red litmus blue. B It is acidic in nature and has pH < 7. C It does not react with water or acids. D It reacts with acids to release carbon dioxide gas. Show answer Hide answer Correct answer: (D) It reacts with acids to release carbon dioxide gas.
Q27 RRB JE CBT-1, 19 Feb 2026, Shift 2 (12:45 PM) Equal pieces of zinc and copper are added separately to dilute sulphuric acid. Which
observation is CORRECT?
A Both metals evolve hydrogen gas B Neither metal evolves hydrogen gas C Only zinc evolves hydrogen gas D Only copper evolves hydrogen gas Show answer Hide answer Correct answer: (C) Only zinc evolves hydrogen gas
Q28 RRB JE CBT-1, 19 Feb 2026, Shift 1 (9:00 AM) Refer to the two statements given below and choose the CORRECT option.
Statement A: Selective reabsorption in nephrons helps maintain water and salt balance
in the body.
Statement B: Selective reabsorption prevents nitrogenous wastes from entering the
filtrate.
A Statement A is incorrect but B is correct. B Both statements A and B are correct. C Both statements A and B are incorrect. D Statement A is correct but B is incorrect. Show answer Hide answer Correct answer: (D) Statement A is correct but B is incorrect.