Sindh Chemistry 2021 — Solved Past Paper with Answers

Q1. Which pair of elements belongs to same group in the periodic table:

• A. Mg and S
• B. O and Br
• C. Na and Al
• D. C and Si✓

Explanation: Explanation will be added soon

Q2. Hydride ion and Helium atom have the same:

• A. Number of protons
• B. Number of neutrons
• C. Valency
• D. Number of electrons✓

Explanation: Explanation will be added soon

Q3. The valence shell electronic configuration of Halogen family is:

• A. ns1
• B. ns2, np6
• C. ns2,(n-1)d5
• D. ns2, np5✓

Explanation: Explanation will be added soon

Q4. Dolomite is a carbonate of:

• A. Ca and Ba
• B. Li and Na
• C. Mg and Al.
• D. Mg and Ca✓

Explanation: Explanation will be added soon

Q5. Nitric acid is frequently transported in a container made of :

• A. Al✓
• B. Cu
• C. Zn
• D. Ag

Explanation: Explanation will be added soon

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

• A. Gun powder
• B. Ammonal✓
• C. Urea
• D. Tincal

Explanation: Explanation will be added soon

Q7. ‘A’ is the element of IIA group while ‘B’ belongs to VA group.

• A. AB
• B. AB3
• C. A3B2✓
• D. A2B3

Explanation: Explanation will be added soon

Q8. Diaspore is an ore of:

• A. Copper
• B. Zine
• C. Iron
• D. Aluminium✓

Explanation: Explanation will be added soon

Q9. Metallic character of p-block elements depends upon electron population of outer most shell and:

• A. Ionization potential✓
• B. Shielding effect
• C. Electronegativity
• D. Hydration energy

Explanation: Explanation will be added soon

Q10. which of the following ligand is chelating agent:

• A. EDTA✓
• B. CN-1
• C. NH3
• D. F-1

Explanation: Explanation will be added soon

Q11. The formula of chromite ore is;

• A. CrO2Cl2
• B. K2Cr2O3
• C. FeOCr2O3✓
• D. K2CrO3

Explanation: Explanation will be added soon

Q12. The Coordination number of Cobalt in [Co(en)2Cl2)Cl is:

• A. 3
• B. 4
• C. 6✓
• D. 8

Explanation: Explanation will be added soon

Q13. The element which is present in group IV-A and 3rd period, its atomic number is:

• A. 15
• B. 14✓
• C. 13
• D. 6

Explanation: Explanation will be added soon

Q14. Oxidation state of oxygen in oxides is:

• A. -2
• B. +2
• C. -1/2✓
• D. -1

Explanation: Explanation will be added soon

Q15. ‘Li’ is powerful reducing agent due to its large value for:

• A. lonization potential
• B. Hydration enthalpy✓
• C. Electron Affinity
• D. Electronegativity

Explanation: Explanation will be added soon

Q16. Aluminium does not react with:

• A. H2SO4
• B. H3PO4
• C. HNO3✓
• D. HCI

Explanation: Explanation will be added soon

Q17. The ligands which form ring structure with central atom is:

• A. Chelate✓
• B. Co-ordination sphere
• C. Cyclic ligand
• D. Polydentate ligand

Explanation: Explanation will be added soon

Q18. Aluminium bronze contains:

• A. 10% Al and 90% Cu✓
• B. 5% Al and 95% Cu
• C. 20% A land 80% Cu
• D. 90% Al and 10% Cu

Explanation: Explanation will be added soon

Q19. The number of unpaired electrons in ferrous ion is:

• A. 2
• B. 3
• C. 4✓
• D. 6

Explanation: Explanation will be added soon

Q20. Coating of Zine on iron is called:

• A. Surface coating
• B. Electroplating
• C. Galvanizing✓
• D. Sheardizing

Explanation: Explanation will be added soon

Q21. On jumping from eg to t2g orbitals electron radiate energy in this region of spectrum:

• A. ultraviolet
• B. visible✓
• C. infrared
• D. far infrared

Explanation: Explanation will be added soon

Q22. Alkanes are also called:

• A. olefins
• B. paraffins✓
• C. proteins
• D. acetylene

Explanation: Explanation will be added soon

Q23. Calcium Carbide on hydrolysis forms:

• A. methane
• B. ethane
• C. benzene
• D. acetylene✓

Explanation: Explanation will be added soon

Q24. This gas is used in welding:

• A. Methane
• B. Ethane
• C. Ethene
• D. Ethyne✓

Explanation: Explanation will be added soon

Q25. Which of the following gives electrophilic substitution reaction:

• A. Benzene✓
• B. Formaldehyde
• C. Ethanol
• D. Ethyne

Explanation: Explanation will be added soon

Q26. This is the most stable carbonium ion:

• A. CH3
• B. RCH2
• C. R2CH
• D. R3C✓

Explanation: Explanation will be added soon

Q27. A dipolar charged but overall electrically neutral ion is called:

• A. Carbinium ion
• B. Zwitterion✓
• C. Oxonium ion
• D. Carbanion ion

Explanation: Explanation will be added soon

Q28. This imparts green colour to glass:

• A. Cr2O3✓
• B. CM0
• C. CoO
• D. MnO2

Explanation: Explanation will be added soon

Q29. Glucose and Fructose:

• A. Position Isomers
• B. Chain Isomers
• C. Functional Group Isomers✓
• D. Metamers

Explanation: Explanation will be added soon

Q30. Which one of the following is Acidic Amino Acid:

• A. Glycine
• B. Alanine
• C. Arginine
• D. Aspartic acid✓

Explanation: Explanation will be added soon

Q31. Wood spirit is the common name of:

• A. Ethanol
• B. Methanol✓
• C. Starch
• D. Sugar

Explanation: Explanation will be added soon

Q32. Which one of the following is a heterocylic compound;

• A. Pyridine✓
• B. Phenol
• C. Benzene
• D. Methane

Explanation: Explanation will be added soon

Q33. The animal starch is:

• A. Cellulose
• B. Glycogen✓
• C. Amylose
• D. Glucose

Explanation: Explanation will be added soon

Q34. The compound obtained by the dry distillation of calcium formate is:

• A. Methanol
• B. Methanal✓
• C. Methane
• D. Acetone

Explanation: Explanation will be added soon

Q35. Another name of fructose is:

• A. d(+) Glucose
• B. Levulose✓
• C. Oligosaccharide
• D. Galactose

Explanation: Explanation will be added soon

Q36. Bakelite is a polymer of phenol and ;

• A. Formaldehyde✓
• B. Ethanol
• C. Ethene
• D. Benzene

Explanation: Explanation will be added soon

Q37. Dehydration of Ethanol produces:

• A. Ethyne
• B. Ethane
• C. Ethene✓
• D. Water gas

Explanation: Explanation will be added soon

Q38. The hybridication in carbonyl group is:

• A. sp
• B. sp2✓
• C. sp3
• D. dsp2

Explanation: Explanation will be added soon

Q39. Polyhydric aldehydes or ketones are known as:

• A. Carbohydrates✓
• B. Protein
• C. Enzymes
• D. Glass

Explanation: Explanation will be added soon

Q40. The number of acidic hydrogen present in I-butyne:

• A. 1✓
• B. 2
• C. 3
• D. 4

Explanation: Explanation will be added soon

Q41. Which one of the following mere directing group:

• A. -NH2
• B. -CH3
• C. -NO2✓
• D. -OH

Explanation: Explanation will be added soon

Q42. Glyoxal is formed by ozonolysis of:

• A. ethene
• B. benzene✓
• C. acetone
• D. acetylene

Explanation: Explanation will be added soon

Q43. When CO2 regets with Grignard reagent it give:

• A. Alcohol
• B. Carboxylic acid✓
• C. Alkane
• D. Ester

Explanation: Explanation will be added soon