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FBISE Paper (2017) MCQs and Answers with explanation

FBISE Paper (2017) MCQs and Answers with explanation

1. For a general reaction,


rate of forward reaction will be equal to





... Answer is c)
Explanation: Rate of forward reaction is directly proportional to active masses of all reactant present in a balaced chemnical equation. In this reaction, rate of forward reaction will directly proportional to Kf[A]2[B]. So correct option is c.

2. At equilibrium state of a reversible reaction





... Answer is d)
Explanation: At equilibrium, concentrations of reactants and products become constant and rate proceed both in forward and reverse direction with equal rates.

3. Kw is called ionization constant of water. Its value can be obtained by





... Answer is b)
Explanation: KW is obtained by Multiplying [H+] and [OH-].

4. Gastric juice has pH =1. It means a





... Answer is b)
Explanation: pH may range from 0-14. As pH becomes lesser, solution becomes more acidic.

5. If an alkane is having 5 carbon atoms, then number of hydrogen atoms in the alkane will be?





... Answer is c)
Explanation: Alkane have general formula of CnH2n+2. C5H2×5+2 = C5H10+2 = C5H12

6. n-pentane, iso-pentane and neo-pentane are having different





... Answer is a)
Explanation: All these compounds have same molecular formulas, molecular mass and same number of hydrogen atoms. They are only differ in structurs. So, correct option is a).

7. By dehydration, we mean the removal of





... Answer is c)
Explanation: Dehydration is the chemical reaction, which involves the removal of water molecule.

8. Which of the following is evolved during the repening of fruits and vegetable





... Answer is d)
Explanation: When fruits are ready to ripen, ethylene gas is evolved. As gas is evolved, hard green fruits into sweet fruit.

9. Ultravoilet radiations are absorbed by ozone in the stratosphere, that is why





... Answer is a)
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. Marbles buildings and statues are destroyed by acidic rain due to reaction of sulphuric acid with





... Answer is d)
Explanation: Marble consists of mostly calcium minerals such as calcite (CaCO3). Marble is commonly used for statues and building materials. Buildings and statues are destroyed due to chemical reaction between CaCO3 and sulphuric acid that produced calcium sulphate , water and carbon dioxide.

11. ice floats over liquid water because





... Answer is c)
Explanation: Ice floats on the surface of water because its volume is greater that volume of water (9%). As a result its density is lesser than liquid water. So, option c) is correct.

12. Which scientist proposed the law of mass action?





... Answer is d)
Explanation: Law of mass action was proposed by CM Guldberg.

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