SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – 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.  
Water gas is a mixture of:

Correct Answer: D [carbon monoxide and hydrogen]

Explanation:

Water gas = CO + H₂ (steam over hot coke); CO + N₂ is producer gas.

2.  
Graphite conducts electricity because:

Correct Answer: A [each carbon has one free electron]

Explanation:

Three bonds per carbon leave one electron free to move along the layers.

3.  
The molecular formula of benzene is:

Correct Answer: C [C₆H₆]

Explanation:

Ring + three double bonds: 14 − 8 = 6 H.

4.  
Match the followingMatch the polymer with its use:
P. Teflon Q. Bakelite R. PVC
1. Electric switches 2. Non-stick pans 3. Pipes

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

Explanation:

Teflon non-stick; Bakelite switches; PVC pipes.

5.  
Conversion of vegetable oil into vanaspati ghee uses which catalyst?

Correct Answer: C [Nickel]

Explanation:

Hydrogenation with a nickel catalyst.

6.  
Odd one out

Correct Answer: A [Rayon]

Explanation:

Rayon is made from natural cellulose (semi-synthetic); the others are fully synthetic.

7.  
Assertion–Reason
A: Water should not be used to put out an oil fire.
R: Oil is lighter than water and floats on it.

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

Explanation:

Burning oil floats and spreads.

8.  
Ethanol reacts with sodium to give:

Correct Answer: B [hydrogen gas]

Explanation:

2Na + 2C₂H₅OH → 2C₂H₅ONa + H₂.

9.  
True/false countHow many of these statements are true?
I. Alkanes are saturated hydrocarbons.
II. Diamond does not conduct electricity.
III. LPG is mainly methane.
IV. Bakelite does not soften on heating.

Correct Answer: D [3]

Explanation:

III is false – LPG is mainly butane.

10.  
Heating natural rubber with sulphur is called:

Correct Answer: A [vulcanisation]

Explanation:

Sulphur cross-links make rubber hard and elastic.

11.  
Spot My Mistake“Pure ethanoic acid is called glacial acetic acid because it boils at 290 K.” The correct reason is:

Correct Answer: C [it melts (freezes) at 290 K]

Explanation:

Melting point 290 K ≈ 17 °C – it freezes in cold weather.

12.  
The molecular mass of hexene, C₆H₁₂ (C = 12, H = 1), is:

Correct Answer: B [84 u]

Explanation:

Answer: 84 u. 14 × 6 = 84 (alkene CₙH₂ₙ).

13.  
Two-quantity comparison
Quantity I: calorific value of LPG
Quantity II: calorific value of CNG

Correct Answer: C [Quantity I > Quantity II]

Explanation:

Answer: Quantity I > Quantity II. 55000 vs 50000 kJ/kg.

14.  
Which compound is an aldehyde?

Correct Answer: D [Ethanal]

Explanation:

Answer: Ethanal. -al ending = –CHO.

15.  
Fill in the blankThe functional group of carboxylic acids is ___.

Correct Answer: B [–COOH]

Explanation:

Answer: –COOH. -oic acid → –COOH.

➤ 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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