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p-Block Element...

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  • Question 1
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    Graphite is a smooth lubricant that is extremely difficult to melt. The reason for this anomalous behaviour is that graphite

  • Question 2
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    Directions For Questions

    In the given question, two statements are provided which are labeled as Assertion (A) and Reason (R). Read both of them carefully and select the alternative that most suitably follows the statements.
     

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    Assertion (A): Diamond is a bad conductor of electricity.
    Reason (R): All C-C bond lengths in diamond are of 154 pm.

  • Question 3
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    Which of the following statements are correct?

    a. Fullerenes have dangling bonds.
    b. Fullerenes are cage-like molecules.
    c. Graphite is thermodynamically the most stable allotrope of carbon.
    d. The successive layers in graphite are held together by weak forces of attraction.

  • Question 4
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    Aluminium vessels should not be washed with substances containing washing soda because

  • Question 5
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    The stability of + 1 oxidation state increases in the sequence

  • Question 6
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    Which of the following statements is correct?

  • Question 7
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    The tendency of BF3, BCl3 and BBr3 to behave as Lewis acids decreases in the sequence

  • Question 8
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    Which of the following does not exist in free form?

  • Question 9
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    A colourless aqueous solution, on adding water and on heating, gave a white precipitate. This precipitate, when reacted with NH4Cl and NH4OH in excess, resulted in dissolution of some of the precipitate and a gelatinous precipitate is obtained. What is the hydroxide formed in aqueous solution?

  • Question 10
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    Which of the following statements is not correct?

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