SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Tier II Level · Marathon

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SSC CGL Science – Chemical Reactions; Acids, Bases & Salts – Tier II Level · Marathon – 10 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.  
The pH of 0.001 M hydrochloric acid (fully ionised) is:

Correct Answer: D [3]

Explanation:

Answer: 3. [H⁺] = 10⁻³ → pH = 3.

2.  
At 25 °C, a solution has pOH = 3. Its pH is:

Correct Answer: D [11]

Explanation:

Answer: 11. pH + pOH = 14 → pH = 11.

3.  
The oxidation number of manganese in KMnO₄ is:

Correct Answer: C [+7]

Explanation:

Answer: +7. 1 + x − 8 = 0 → x = +7.

4.  
The oxidation number of sulphur in H₂SO₄ is:

Correct Answer: B [+6]

Explanation:

Answer: +6. 2 + x − 8 = 0 → x = +6.

5.  
The oxidation number of oxygen in hydrogen peroxide (H₂O₂) is:

Correct Answer: A [−1]

Explanation:

Peroxide: 2(+1) + 2x = 0 → x = −1.

6.  
According to the Brønsted–Lowry concept, ammonia (NH₃) is a base because it:

Correct Answer: B [accepts a proton (H⁺)]

Explanation:

Answer: accepts a proton (H⁺). NH₃ + H⁺ → NH₄⁺.

7.  
Which of these is a Lewis acid?

Correct Answer: A [BF₃]

Explanation:

BF₃ has an incomplete octet and accepts an electron pair; the others donate pairs.

8.  
The pH of human blood is kept near 7.4 mainly by the buffer system of:

Correct Answer: C [carbonic acid and hydrogencarbonate]

Explanation:

H₂CO₃/HCO₃⁻ is the main blood buffer.

9.  
The hydrogen ion concentration of a solution of pH 5 is:

Correct Answer: D [10⁻⁵ mol/L]

Explanation:

Answer: 10⁻⁵ mol/L. [H⁺] = 10⁻ᵖᴴ = 10⁻⁵ mol/L.

10.  
Two-quantity comparison
Quantity I: oxidation number of Cr in K₂Cr₂O₇
Quantity II: oxidation number of S in SO₄²⁻

Correct Answer: A [Quantity I = Quantity II]

Explanation:

Cr: (14 − 2) ÷ 2 = +6; S: x − 8 = −2 → +6.

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