NEET
Practice Test 10
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The factor responsible for weak acidic nature of B–F bonds in BF3 is

  • Solution

    It is pπ-p π back bonding involving B and F. The smaller atoms show more back bonding.

Anhydrous AlCl3 can not be obtained from which of the following reactions ?

  • Solution

The precious Ruby stone is

  • Solution

    Alumina Al2O3 is known as Ruby stone

The role of fluorspar ( CaF2) which is added in small quantities in the electrolytic reducation of alumina dissolved in fused cryolite (Na3AlF6) is

  • Solution

    CaF2 when added to fused Cryolite, lowers them.p.and increases the conductivity.

Which of the following does not exist in free form

  • Solution

    Boron form different hydride of general formula BnHn+4 and BnHn+6 but BH3 is unknown.

Silicon carbide is used as a/ an

  • Solution

    Abrasive is tough material used for sharpening and grinding the uneven surfaces and silicon carbide is used for grinding glass.

Moissan boron is

  • Solution

    Moissan boron is amorphous boron,obtained by reduction of B2O3 with Na or Mg. It has 95-98% boron and is black in colour.

The hardest substance amongst the following is

  • Solution

    B4C is the hardest substance after diamond and BN.

Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion

  • Solution

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The p-Block Elements (Group 13 and 14)
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