Sindh Chemistry 2022 — Solved Past Paper with Answers

Q1. These eclements EKa- Aluiminium and EKa-Silicon were known as:

• A. Gallium and Germanium✓
• B. Gallium and Silicon
• C. Aluminium and Germanium
• D. Beryllium and Magnesium

Explanation: Explanation will be added soon

Q2. Elements of group VI—A are called:

• A. alkali metals
• B. chalcogens✓
• C. coinage mctals
• D. halogens

Explanation: Explanation will be added soon

Q3. Elements of this group forms an ion with charge +3:

• A. 1A
• B. IIA
• C. lll A✓
• D. VA

Explanation: Explanation will be added soon

Q4. All elements form ionic hydrides except:

• A. Li
• B. Na
• C. Be✓
• D. Ca

Explanation: Explanation will be added soon

Q5. This group forms basic hydrides:

• A. IIIA
• B. IVA
• C. VA✓
• D. VIA

Explanation: Explanation will be added soon

Q6. The half life of radioactive isotope of hydrogen is:

• A. 10.5 years
• B. 12.5 years✓
• C. 13.5 years
• D. 14.5 years

Explanation: Explanation will be added soon

Q7. This element of IA group forms a superoxide: :

• A. Li
• B. Na
• C. K✓
• D. Sr

Explanation: Explanation will be added soon

Q8. This one is liberated at the anode during clectrolysis of brine in diaphragm cellis:

• A. H2
• B. Na
• C. Cl2✓
• D. O2

Explanation: Explanation will be added soon

Q9. This one has maximum hydration energy:

• A. Be2+✓
• B. Mg2+
• C. Ca2+
• D. Ba2+

Explanation: Explanation will be added soon

Q10. The oxidation state of nitrogen in HNO3 is

• A. +3
• B. -3
• C. +5✓
• D. -5

Explanation: Explanation will be added soon

Q11. Duralumin is an alloy of:

• A. Iron
• B. Nickle
• C. Zinc
• D. Aluminium✓

Explanation: Explanation will be added soon

Q12. The Basicity of ortho boric acid is:

• A. 1✓
• B. 2
• C. 3
• D. 4

Explanation: Explanation will be added soon

Q13. All elements get corroded expect

• A. Iron
• B. Copper
• C. Zinc
• D. Gold✓

Explanation: Explanation will be added soon

Q14. The coordination number of Co in [Co(en)2Cl2]+1 is:

• A. 3
• B. 4
• C. 5
• D. 6✓

Explanation: Explanation will be added soon

Q15. This metal is used for galvanizing:

• A. Fe
• B. Co
• C. Ni
• D. Zn✓

Explanation: Explanation will be added soon

Q16. The hybridization of all carbon atoms in cyclohexane (C6H12) is:

• A. sp
• B. sp2
• C. sp3✓
• D. dsp3

Explanation: Explanation will be added soon

Q17. This catalyst is used as ‘Knock inhibitor’:

• A. Platinium
• B. Zeolite
• C. Tetra Ethyl Lead✓
• D. Raney Nickel

Explanation: Explanation will be added soon

Q18. The general formula of ester is:

• A. RCOOH
• B. RNH2
• C. RCOR
• D. RCOOR✓

Explanation: Explanation will be added soon

Q19. This compound obeya Markonikoff rule whenreacting with HBr:

• A. CH3 —CH3
• B. CH2 = CH2✓
• C. CH3 -CH=CH2
• D. CH3-— CH = CH- CH3

Explanation: Explanation will be added soon

Q20. Vinyl chloride polymerizes into:

• A. PVA
• B. PVC✓
• C. Bakclite
• D. Perspex

Explanation: Explanation will be added soon

Q21. The dehydration of alcohol gives:

• A. Alkane
• B. Alkene✓
• C. Alkyne
• D. Benzene

Explanation: Explanation will be added soon

Q22. This compound gives SN1, mechanism:

• A. Chlorobenzene
• B. Chiorocthane
• C. Chloromethanc
• D. 2-chloro2-mecthyl propanc✓

Explanation: Explanation will be added soon

Q23. The most stable carbonium ion is:

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

Explanation: Explanation will be added soon

Q24. CH3I reacted with sodium metal to form:

• A. CH3OH
• B. C2H2
• C. C2H4
• D. C2H6✓

Explanation: Explanation will be added soon

Q25. The colour of precipitate obtained in lodoform test is:

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

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Q26. Ethyl acctate is present in:

• A. Pineapple✓
• B. Guava
• C. Orange
• D. Lemon

Explanation: Explanation will be added soon

Q27. This one does not contain carboxyl group:

• A. Acctic Acid
• B. Benzoic Acid
• C. Picric Acid✓
• D. Butyric Acid

Explanation: Explanation will be added soon

Q28. The animal starch is:

• A. Glycogen✓
• B. Amylose
• C. Cellulose
• D. Amino Acids

Explanation: Explanation will be added soon

Q29. Blood cancer is caused by:

• A. Methane
• B. Ethane
• C. Butane
• D. Benzene✓

Explanation: Explanation will be added soon

Q30. Bleeding of teeth is caused by the deficiency of this vitamin:

• A. D
• B. C✓
• C. B
• D. A

Explanation: Explanation will be added soon

Q31. Bakelite is a polymer of:

• A. Pheno - Formaldehyde✓
• B. Urea - Formaldehyde
• C. Phenol - Benzaldehydr
• D. Phenol - Urea

Explanation: Explanation will be added soon

Q32. This impart green colour to glass:

• A. Cr203✓
• B. CoO
• C. CuO
• D. Zn0

Explanation: Explanation will be added soon

Q33. Fertilizer maintains this pH of the soil:

• A. 7 to 8✓
• B. 6 to 7
• C. 9 to ll
• D. 12 to 14

Explanation: Explanation will be added soon