SSC CGL Science – Chemistry in Everyday Life – Tier II Level · Marathon

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SSC CGL Science – Chemistry in Everyday Life – 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.  
In the Ostwald process, ammonia is oxidised over a catalyst of:

Correct Answer: D [platinum–rhodium gauze]

Explanation:

Answer: platinum–rhodium gauze. 4NH₃ + 5O₂ → 4NO + 6H₂O.

2.  
In N₂ + H₂ → NH₃, the balanced coefficient of H₂ is:

Correct Answer: C [3]

Explanation:

Answer: 3. N₂ + 3H₂ → 2NH₃.

3.  
Oleum is:

Correct Answer: B [H₂S₂O₇]

Explanation:

Answer: H₂S₂O₇. SO₃ + H₂SO₄ → H₂S₂O₇.

4.  
The percentage of water in Glauber's salt, Na₂SO₄·10H₂O, is about:

Correct Answer: D [55.9%]

Explanation:

Answer: 55.9%. 180/322.

5.  
Salvarsan, the first effective drug for syphilis, was developed by:

Correct Answer: A [Paul Ehrlich]

Explanation:

Answer: Paul Ehrlich. Start of chemotherapy.

6.  
Which sweetener is about 2000 times as sweet as cane sugar?

Correct Answer: D [Alitame]

Explanation:

Sweet ladder 100-550-600-2000.

7.  
Which antibiotic is broad-spectrum?

Correct Answer: B [Chloramphenicol]

Explanation:

Chloramphenicol acts on a wide range of bacteria.

8.  
The nitrogen percentage of pure diammonium phosphate, (NH₄)₂HPO₄, is:

Correct Answer: C [21.21%]

Explanation:

28/132 × 100 = 21.21% (commercial grade is labelled 18% N).

9.  
Calgon, used to soften water, is:

Correct Answer: A [sodium hexametaphosphate]

Explanation:

Calgon ties up Ca²⁺ and Mg²⁺ in soluble complexes.

10.  
Two-quantity comparison
Quantity I: nitrogen % in ammonium sulphate
Quantity II: nitrogen % in DAP (pure)

Correct Answer: D [Quantity I = Quantity II]

Explanation:

Both have 2 N and mass 132 → 21.21%.

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