SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Level 2 · Exam Level · Tier I Sprint – 15 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
When Na + H₂O → NaOH + H₂ is balanced with the smallest whole numbers, the coefficient of H₂O is:

Correct Answer: C [2]

Explanation:

Answer: 2. 2Na + 2H₂O → 2NaOH + H₂.

2.  
Match the followingMatch the reaction with its type:
P. CaCO₃ → CaO + CO₂ Q. Fe + CuSO₄ → FeSO₄ + Cu R. NaOH + HCl → NaCl + H₂O
1. Neutralisation 2. Displacement 3. Thermal decomposition

Correct Answer: B [P-3, Q-2, R-1]

Explanation:

Heat splits CaCO₃; iron displaces copper; acid + base → salt + water.

3.  
A solution of pH 1 has how many times more H⁺ ions than a solution of pH 5?

Correct Answer: D [10,000]

Explanation:

5 − 1 = 4 steps → 10⁴ = 10,000 times.

4.  
Odd one outwhich of these is a base but NOT an alkali?

Correct Answer: A [Copper(II) oxide]

Explanation:

CuO neutralises acids but does not dissolve in water; the others are soluble bases (alkalis).

5.  
The solution of which salt turns red litmus blue?

Correct Answer: B [sodium acetate (CH₃COONa)]

Explanation:

CH₃COONa: weak acid + strong base → basic.

6.  
Assertion–Reason
A: Lime water turns milky when carbon dioxide is passed through it.
R: Insoluble calcium carbonate is formed.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

Ca(OH)₂ + CO₂ → CaCO₃ (white, insoluble) + H₂O.

7.  
Sodium sulphate solution is mixed with barium chloride solution. The white precipitate formed is:

Correct Answer: D [BaSO₄]

Explanation:

Na₂SO₄ + BaCl₂ → BaSO₄ (white ppt) + 2NaCl.

8.  
True/false countHow many of these statements are true?
I. Electrolysis of water gives hydrogen and oxygen in the volume ratio 2 : 1.
II. Decomposition reactions generally need energy.
III. Respiration is an endothermic process.
IV. Neutralisation releases heat.

Correct Answer: C [3]

Explanation:

III is false – respiration releases energy (exothermic).

9.  
The chemical formula of washing soda is:

Correct Answer: D [Na₂CO₃·10H₂O]

Explanation:

Wash Two-Ten: two Na and ten waters.

10.  
Spot My Mistake“Gypsum, CaSO₄·½H₂O, is heated at 373 K to give plaster of Paris, CaSO₄·2H₂O.” The correct formula of gypsum is:

Correct Answer: B [CaSO₄·2H₂O]

Explanation:

The formulae were swapped: gypsum has 2H₂O; plaster of Paris has ½H₂O.

11.  
The products of the chlor-alkali process are:

Correct Answer: A [sodium hydroxide, chlorine and hydrogen]

Explanation:

2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂.

12.  
Two-quantity comparisonTwo-quantity comparison (balanced combustion of methane, CH₄ + O₂ → CO₂ + H₂O):
Quantity I: coefficient of O₂
Quantity II: coefficient of H₂O

Correct Answer: C [Quantity I = Quantity II]

Explanation:

CH₄ + 2O₂ → CO₂ + 2H₂O: both 2.

13.  
A yellow curry stain on a white cloth turns reddish-brown when washed with soap because:

Correct Answer: A [soap solution is basic and turmeric is an indicator]

Explanation:

Turmeric turns reddish-brown in basic solutions.

14.  
Which of these is an olfactory indicator?

Correct Answer: C [Onion]

Explanation:

Olfactory indicators change smell: onion, vanilla essence, clove oil.

15.  
Fill in the blankBaking powder is a mixture of baking soda and a mild edible acid such as ___.

Correct Answer: B [tartaric acid]

Explanation:

Tartaric acid removes the bitter taste of the sodium carbonate formed.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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