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FBISE Paper (2018) MCQs and Answers with explanation

FBISE Paper (2019) MCQs and Answers with explanation

1. In an irreversible reaction, equilibrium is:





... Answer is c)
Explanation: Equilibrium is established for reversible reaction. Chemical equilibrium is only established when rate of forward reaction becomes equal to rate of reversible reaction. For irreversible reactions, there is only farward reaction and no reverse reaction, so chemical equilibrium never establish for irreversible reaction. Hence, option c) is correct.

2. Which of the following is a Lewis base





... Answer is d)
Explanation: Electron pair donor is called Lewis bas and electron pair acceptor is called Lewis acid. BF3 and AlCl3 have electron deficient B and Al atoms, respectively. So, BF3 and AlCl3 are electron acceptor and act as Lewis acids. HCl acts as a whole as lewis acid. Only F- has an electron pair which it can donate. Hence, correct answer is option d).

3. What is the colour of phenolphthalein In acidic medium





... Answer is c)
Explanation: In acidic medium, color of phenolphthalein is colorless, while color of methyl orange and bromothymole blue are red and yellow, respectively. In basic medium, colors of phenolphthalein, methyl red and bromothymole blue are pink, yellow and blue, respectively.

4. (iv) Formic acid contains functional group:





... Answer is b)
Explanation: As name indicates, formic acid contains carboxylic functional group (COOH).

5. Which of the following is a hetrocyclic compounds?





... Answer is d)
Explanation: The cyclic compounds which contain one or more other atoms than carbon in their cyclic rings are called hetrocyclic compound. Thiophene contains on s atom in its cyclic ring. So it is a hetrocyclic compound.

6. (i) Which of the following reacts with concentrated alkaline KMnO4 to produce oxalic acid





... Answer is c)
Explanation: Ethyne reacts with concentrated alkaline KMnO4 to give tetrahydroxy ethane followed by glyoxal and then oxalic acid. Ethene reacts with dilute alkaline KMnO4 to give final product of etylene glycole. Ethane and alcohol do not react with alkaline KMnO4. So, correct option is a).

7. Which of the following is used as domestic fuel





... Answer is a)
Explanation: Methane is used as domestic fuel (sui gas), because
i. its combustion can be controlled
ii. it produce large amount of heat.
iii. it is readily available,

8. Plants convert glucose into





... Answer is b)
Explanation: Plant convert glucose into starch as excess energy.

9. Which of the following layers contains ozone gas?





... Answer is d)
Explanation: Stratosphere contains maximum amount of ozone (10 ppm) and little water vapours. The presence of ozone is responsible for rise in temperature in stratosphere.

10. Most of air pollution is caused by:





... Answerq10 b)
Explanation: Most of air pollution is caused by burning of fossil fuels such as coal, petroland natural gas.

11. Which of the following is not water-born disease?





... Answerq11 b)
Explanation: Anemia is not water-born disease. It is caused by deficiency of vitamin B complex.

12. Which of the following is used as raw material for praparation of urea?





... Answerq12 d)
Explanation: Raw material for preparation of urea are CO2 and NH3

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