Sindh Chemistry 2024 Model Paper — Solved Past Paper with Answers

Q1. The oxidation states of the elements of group VA:

• A. +1 and +3
• B. -3 and -5
• C. -3,+3and+5
• D. +1,-l and +3✓

Explanation: Explanation will be added soon

Q2. Which of the following s-block element form super oxide when bum in air:

• A. Li
• B. Na
• C. K
• D. Mg✓

Explanation: Explanation will be added soon

Q3. In the equilibrium of dichromate-chromate ion the colour of CrO-14? is:

• A. Orange
• B. Green
• C. Yellow
• D. Red✓

Explanation: Explanation will be added soon

Q4. The coordination number of cobalt in Na,[ Co(C2O4)3] is:

• A. 3
• B. 4
• C. 6
• D. 7✓

Explanation: Explanation will be added soon

Q5. The knocking of internal combustion engine can be reduced by the following petroleum process:

• A. Reforming
• B. Refining
• C. Distillation
• D. Condensation✓

Explanation: Explanation will be added soon

Q6. How many optical isomers are possible for CH (OH)COOH | CH (Br)COOH

• A. 2
• B. 3
• C. 4
• D. 5✓

Explanation: Explanation will be added soon

Q7. Which of the following pairs of compounds represent functional group isomerism:

• A. I-butene and 2-butene
• B. Ethanol and dimethyl ether
• C. n-butane and iso butane
• D. Diethyl ketone and methyl propyl ketone✓

Explanation: Explanation will be added soon

Q8. Benzene burns with Smokey flame because of its:

• A. Inflammablity
• B. High carbon % age
• C. High resonance energy
• D. Aromaticity✓

Explanation: Explanation will be added soon

Q9. The Kinetics of Elimination biomolecular reaction is:

• A. Zero order
• B. First order
• C. Second Order
• D. Third order✓

Explanation: Explanation will be added soon

Q10. Lucas reagent is a mixture of:

• A. Zn and Hg
• B. Zn and HCI
• C. ZnCl2; and HCI
• D. NaOH and CaO✓

Explanation: Explanation will be added soon

Q11. Clemmensen reduction is the conversion of aldehydes and ketones into:

• A. Alkanes
• B. Alkenes
• C. Alkyl halides
• D. Alcohols✓

Explanation: Explanation will be added soon

Q12. Formic acid is naturally found in:

• A. Valciran root
• B. Bees string
• C. Vinegar
• D. Butter✓

Explanation: Explanation will be added soon

Q13. An example of quatemary structure of protein is:

• A. Myoglobin
• B. Hemoglobin
• C. Albumin
• D. Globulin✓

Explanation: Explanation will be added soon

Q14. Drugs that lower the body temperature to normal are known as:

• A. Antibiotics
• B. Antipyretic
• C. Antiallergic
• D. Anti histamins✓

Explanation: Explanation will be added soon

Q15. An example of thermosetting plastic is:

• A. Polyethene
• B. PVC
• C. Nylon
• D. Bakelite✓

Explanation: Explanation will be added soon

Q16. The region of sphere which extend from1km to 50km from our Earth’s is known as

• A. Troposphere
• B. Stratosphere
• C. Mesosphere
• D. Thermosphere✓

Explanation: Explanation will be added soon

Q17. Infra red spectroscopy is a technique use to determine:

• A. Double and tnple bonds
• B. Mass to charge ratio
• C. Functional group
• D. Conjugated system✓

Explanation: Explanation will be added soon