SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Level 1 · Warm-up · Tier I Level – 12 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.  
Passing electricity through acidified water (2H₂O → 2H₂ + O₂) is an example of:

Correct Answer: D [electrolytic decomposition]

Explanation:

One substance breaks up using electricity.

2.  
The acid present in vinegar is:

Correct Answer: A [acetic acid]

Explanation:

Vinegar is dilute acetic (ethanoic) acid.

3.  
In an acidic solution, blue litmus paper:

Correct Answer: C [turns red]

Explanation:

Answer: turns red. Acids turn blue litmus red.

4.  
The pH of pure water at 25 °C is:

Correct Answer: B [7]

Explanation:

Answer: 7. Pure water is neutral: pH 7.

5.  
The chemical formula of baking soda is:

Correct Answer: A [NaHCO₃]

Explanation:

Baking soda = sodium hydrogencarbonate, NaHCO₃ (Bake One).

6.  
When a metal such as zinc reacts with a dilute acid, the gas released is:

Correct Answer: D [hydrogen]

Explanation:

Metal + acid → salt + H₂ (burns with a pop).

7.  
Rusting of iron is an example of:

Correct Answer: C [oxidation]

Explanation:

Iron combines with oxygen (and water) → hydrated iron oxide.

8.  
Packets of potato chips are flushed with which gas to prevent rancidity?

Correct Answer: B [Nitrogen]

Explanation:

Unreactive nitrogen keeps oxygen away from the oil.

9.  
Which of these is used as an antacid?

Correct Answer: C [Milk of magnesia]

Explanation:

Milk of magnesia (Mg(OH)₂) is a mild base that neutralises excess stomach acid.

10.  
The sting of an ant injects:

Correct Answer: A [methanoic (formic) acid]

Explanation:

Formica = ant in Latin → formic (methanoic) acid.

11.  
Diagram-basedOn the pH scale shown, which letter best matches a baking soda solution?

Correct Answer: D [R]

Explanation:

Baking soda solution is weakly basic, pH about 8–9 → R.

12.  
Fill in the blankPhenolphthalein turns ___ in a basic solution.

Correct Answer: B [pink]

Explanation:

Phenolphthalein: colourless in acid, pink in base.

➤ 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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