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FBISE Paper (2018 Supplementary) MCQs and Answers with explanation

FBISE Paper (2018 Supplementary) MCQs and Answers with explanation

1. What are the units of KC for





... Answer is b)
Explanation: As number of moles of reactants and product are same. So, there will be no units for Kc. e.g.,

2. For a reversible reaction,


which substance is the product of the chemical reaction?





... Answer is d)
Explanation: In equilibrium constant expression for a chemical reaction, product(s) are present in numerator and reactant(s) are present in denominator.

3. which of the following acid is used for manufacturing of many chemicals, drugs, dyes, paints and explosives





... Answer is c)
Explanation: H2SO4 is used in manufacturing of many chemicals and products. That is why, it is also called king of chemicals.

4. At what pH, phenolphthalene changes its color





... Answer is b)
Explanation: pH may range from 0-14. At acidic pH(pH<7 at="" basic="" colorless="" is="" ph="" phenolphthalene="" while="">7), phenolphthalene color is pink. At pH = 7, phenolphthalene changes its color.

5. -------------is used for artificial ripening of fruits





... Answer is b)
Explanation: For artificial ripening of fruits, acetylene is used. The gas evolved during ripening is ethene. Hence, the correct option is b.

6. In which of the following oxygen is attached with two alkyl groups





... Answer is c)
Explanation: In ethers, oxygen is bonded with two alkyl groups

7. Reduction of alkyl halide takes place in the presence of





... Answer is d)
Explanation: Alkyl halide is converted into alkane in the presence of .Zn + HCl.

8. Which process produces an alkane





... Answer is d)
Explanation: Hydrogenation of alcohol is produced by hydrogenation of alkene.

9. -----------------is used to make ractified spirit by fermentation process





... Answer is d)
Explanation:Ractified is almost 95% ethanol. When sugar (sucrose) is fermented by yeast, fermented alcohol is produced.

10. Raffinose(C18H32O16)is a





... Answer is c)
Explanation: Raffinose (C18H32O16)molecule is made up three monosaccharides (simple sugar) units which are glucose, fructose and glactose. So it is a trisaccharide.

11. The atomospheric layer that has the temperature range of -5 C to -93 C is





... Answer is c)
Explanation: Above the stratosphere, temperature falls down from-5 to -93 C..

12. Chemical formula of slaked lime is





... Answer is c)
Explanation: When lime stone (CaCO3)is heated, lime (CaO) is produced. When lime is dissolved in water, slaked lime (Ca(OH)2) is produced.

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