SSC CGL Science – Periodic Table & Chemical Bonding – Level 3 · Challenge

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SSC CGL Science – Periodic Table & Chemical Bonding – 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.  
Element X (Z = 12) combines with element Y (Z = 9). The formula and bond type are:

Correct Answer: C [XY₂, ionic]

Explanation:

X: 2, 8, 2 → X²⁺; Y: 2, 7 → Y⁻; metal + non-metal → ionic XY₂ (MgF₂).

2.  
Statement-basedWhich were features of Mendeleev's periodic table?
I. He left gaps for undiscovered elements.
II. He placed cobalt before nickel though cobalt has the higher atomic mass.
III. It was based on atomic number.

Correct Answer: B [Only I and II]

Explanation:

Mendeleev used atomic mass, not atomic number.

3.  
Which order of electronegativity is correct?

Correct Answer: D [F > O > N > C]

Explanation:

Same period (2): electronegativity rises left to right – C, N, O, F.

4.  
An element is in period 3 and group 16. Its atomic number is:

Correct Answer: C [16]

Explanation:

Period 3 → 3 shells; group 16 → 6 valence electrons: 2, 8, 6 = 16 (sulphur).

5.  
The total number of shared electron pairs (bonds) in hydrogen cyanide, H–C≡N, is:

Correct Answer: A [4]

Explanation:

Bond Counter: (2 + 8 + 8 − 10) ÷ 2 = 4 → one C–H and three in C≡N.

6.  
Match the followingMatch the substance with the main bonding involved:
P. MgCl₂ Q. Cl₂ R. Copper wire S. Ice (between molecules)
1. Metallic 2. Hydrogen bonding 3. Ionic 4. Non-polar covalent

Correct Answer: D [P-3, Q-4, R-1, S-2]

Explanation:

MgCl₂ ionic; Cl–Cl equal sharing; copper metallic; ice held by hydrogen bonds.

7.  
Which pair of atomic numbers belongs to the same group?

Correct Answer: B [9 and 17]

Explanation:

9 (2, 7) and 17 (2, 8, 7) are both halogens.

8.  
The formula of ammonium sulphate is:

Correct Answer: A [(NH₄)₂SO₄]

Explanation:

NH₄⁺ (1) and SO₄²⁻ (2) → (NH₄)₂SO₄.

➤ 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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