SSC CGL Science – Chemistry in Everyday Life – Level 3 · Challenge
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Silver halide crystals darken in light and clear in shade.
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SSC CGL Science – Chemistry in Everyday Life – Level 3 · Challenge – 8 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.
Arrange in orderArrange in decreasing order of nitrogen content: ammonium sulphate, urea, ammonium nitrate, sodium nitrate.
Correct Answer: A [urea > ammonium nitrate > ammonium sulphate > sodium nitrate]
Explanation:
Answer: urea > ammonium nitrate > ammonium sulphate > sodium nitrate. 46.67 > 35 > 21.21 > 16.47.
2.
The formula mass of Mohr's salt, (NH₄)₂Fe(SO₄)₂·6H₂O (Fe = 56), is:
Correct Answer: D [392 u]
Explanation:
Answer: 392 u. 36 + 56 + 192 + 108 = 392.
3.
The percentage of water of crystallisation in Epsom salt, MgSO₄·7H₂O, is about:
Correct Answer: B [51%]
Explanation:
Answer: 51%. 126 ÷ 246 × 100 ≈ 51%.
4.
Statement-basedWhich are correct?
I. Temporary hardness is removed by boiling.
II. Calcium sulphate causes permanent hardness.
III. Soaps work well in hard water.
I. Temporary hardness is removed by boiling.
II. Calcium sulphate causes permanent hardness.
III. Soaps work well in hard water.
Correct Answer: A [Only I and II]
Explanation:
Soap forms scum in hard water.
5.
Water containing magnesium hydrogencarbonate is boiled. The magnesium settles out mainly as:
Correct Answer: C [Mg(OH)₂]
Explanation:
Mg(HCO₃)₂ → Mg(OH)₂ + 2CO₂ on boiling.
6.
Which pair is correctly matched?
Correct Answer: C [Saccharin – artificial sweetener]
Explanation:
BHT is an antioxidant; equanil a tranquilliser; morphine a narcotic analgesic.
7.
100 kg of urea supplies the same nitrogen as about how much ammonium nitrate?
Correct Answer: B [133.3 kg]
Explanation:
Both have 2 N per formula unit: 100 × 80/60 ≈ 133.3 kg.
8.
Glass containing which compound darkens in bright sunlight (photochromic)?
Correct Answer: A [Silver halides]
Explanation:
Silver halide crystals darken in light and clear in shade.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science
📘 SSC CGL 2026 – General Science (Tier I + Tier II)
Here you get the answer with a one-line explanation. 1,110 original questions with answer key and explanations · mind-maps, notes, tables and shortcuts · Tier I and Tier II practice sets + 3 mock tests
Get the book – ₹149 More quizzes
› SSC CGL Science – Mock Test 3 – Tier II Style
› SSC CGL Science – Mock Test 2 – Tier I Style
› SSC CGL Science – Mock Test 1 – Tier I Style
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› SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 2 · Exam Level · Tier I Sprint
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