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NEET Test 43

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NEET Test 43
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The generative cell of pollen grain in a flowering plant, divides mitotically to produce

    Solution

    A mature pollen grain contains two cells: the vegetative cell and generative cell. Vegetative cell is larger in size and has food reserve. The generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed.

     

  • Question 2
    4 / -1

    _______ require an external source of an electron

    Solution

    In Z scheme flow or non cyclic photophosphorylation there is constant flow of water is essential for electron supply. Both PSI and PSII should function jointly for smooth flow of electrons. 

    In cyclic photophosphorylation electrons are derived from PSI and de energized electrons return back to PSI.

     

  • Question 3
    4 / -1

    Nitrobacter and nitrococcus is used in the process of _________.

    Solution

    nitrification involves the oxidation of ammonia to nitrite by nitrococcus and later oxidation to nitrate by nitrobacter.

     

  • Question 4
    4 / -1

    Auxin is one of the most widely applicable phytohormone. Which among the following statements is not true about describing auxin ?

    Solution

    Phospholipases are enzymes needed for secretion of auxin at root apices.

     

  • Question 5
    4 / -1

    The most acidic compound is

    Solution

    Inductive effect decreases rapidly with distance, therefore, acidic strength decreases as the distance of EWG increases from carboxylic acid. Hence, 2-chloropropanoic acid is the most acidic among the given compounds.

     

  • Question 6
    4 / -1

    Find the decreasing order of acidity?

    Solution

    Direct bonding of groups such as phenyl or vinyl to the carboxylic acid, increases the acidity of corresponding carboxylic acid. When the electronegativity of the carbon which is directly attached to –COOH group increases, the acidity of carboxylic acid also increases. 

    E.N. in decreasing order is : sp> sp2> sp3 hybridised carbon. 

    Hence decreasing order of acidity is- 

    CH≡C-COOH> C6H5-COOH> CH2═CH-COOH> CH3-COOH

     

  • Question 7
    4 / -1

    Decreasing order of acidity among HCOOH, CH3COOH, C6H5COOH must be-

    Solution

    In benzoic acid –COOH is attached to sp2 hybridised carbon atom of phenyl ring while it is attached to sp3 hybridised carbon atom of –CH3 group. Formic acid does not have alkyl group, hence it is stronger acid than benzoic acid.

     

  • Question 8
    4 / -1

    The correct decreasing order of acidity is

    Solution

    Generally the presence of an electron donating group decreases the acidity of carboxylic acid. Therefore, higher the number of electron donating groups present in the carboxylic acid molecule, lesser will be its acidic strength. Thus, the correct order of acidity is 

    CH3-COOH > CH3-CH2-COOH > (CH3)2-CH-COOH > (CH3)3-COOH

     

  • Question 9
    4 / -1

    In the preparation of acid halide from carboxylic acid, the reagent preferred is

    Solution

    Use of SOCl2 is preferred over the use of PCl3 and PCl5, because in this reaction the other two products obtained are gaseous i.e., SO2and HCl, which escape itself from the container, leaving behind the acid halide.

     

  • Question 10
    4 / -1

    Which of the following universal law corresponds to the Lenz’s law?

    Solution

    Lenz’s Law corresponds to the law of conservation of energy. Induced EMF produces a current that opposes the change in flux, because the change in flux means a change in energy. Energy can enter or leave, but not instantaneously.

     

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