Sindh Chemistry 2018 — Solved Past Paper with Answers

Q1. All noble gases fulfill the octet rule except

• A. Kr
• B. Ne
• C. He✓
• D. Ar

Explanation: Explanation will be added soon.

Q2. The element belonging to group VA and period has the atomic number

• A. 7
• B. 13
• C. 15✓
• D. 23

Explanation: Explanation will be added soon.

Q3. The number of neutrons in protium is

• A. Zero✓
• B. 1
• C. 2
• D. 3

Explanation: Explanation will be added soon.

Q4. This has the minimum hydration energy

• A. Na+
• B. K+
• C. Rb+
• D. Cs+✓

Explanation: Explanation will be added soon.

Q5. Both crystalline forms of sulphur exist at this transition temperature

• A. 94.5°C
• B. 95.5°C✓
• C. 96.5°C
• D. 98.5°C

Explanation: Explanation will be added soon.

Q6. The mixture of Aluminium nitrate and Aluminium powder is called

• A. Duralumin
• B. Ammonal✓
• C. Carnallite
• D. Alum

Explanation: Explanation will be added soon.

Q7. Elements of group IB are called

• A. Normal elements
• B. Rare earth metals
• C. Coinage metals✓
• D. Alkali metals

Explanation: Explanation will be added soon.

Q8. Metallic hydrides are also known as

• A. Intertestial hydrides✓
• B. Borderline hydrides
• C. Ionic hydrides
• D. Covalent hydrides

Q9. Cycloalkanes have the general formula

• A. CnH2n+1
• B. CnH2n✓
• C. CnH2n-2
• D. CnH2n-1

Q10. The functional group in RSH is

• A. Aldehyde
• B. Carboxylic acid
• C. Ether
• D. Thioalcohol✓

Q11. Another name of methane is

• A. Mustard gas
• B. Oil gas
• C. Coal gas
• D. Marsh gas✓

Explanation: Explanation will be added soon.

Q12. The most stable carbonium ion is

• A. R3C+✓
• B. R2CH+
• C. R2CH+2
• D. CH+3

Explanation: Explanation will be added soon.

Q13. Rectified spirit contains

• A. 75-80% Alcohol
• B. 92-95% alcohol✓
• C. 80-85% alcohol
• D. 100% alcohol

Explanation: Explanation will be added soon.

Q14. It is used as a preservative for biological specimens

• A. Petrol
• B. Acetone
• C. Formalin✓
• D. Benzene

Explanation: Explanation will be added soon.

Q15. Glycogen is a

• A. Monosaccharide
• B. Oligosaccharide
• C. Polysaccharide✓
• D. Disaccharide

Explanation: Explanation will be added soon.

Q16. The green colour of glass is due to the presence of

• A. CuO
• B. CoO
• C. Cr2O3✓
• D. ZnO

Explanation: Explanation will be added soon.