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Standard XII

Chemistry

Acidic Character, Basic Character and Nature of Oxides

Boron is a fa...

Question

Boron is a fairly rare element however, it has many important application. It is a non-metal and has a very high melting point of 2180°C. It is extracted from borax and it form a large number of electron deficient compound.

Select the correct statement(s)

Crystalline boron may be obtained by thermal decomposition of diborane

(B_{2} H_{6})

B I_{3}

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Amorphous boron may be obtained by the reduction of

B_{2} O_{3}

at high temperature using sodium or magnesium

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Boron can form

B F_{6}^{3 -}

ion

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B_{2} O_{3}

is a basic oxide

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Solution

The correct option is B Amorphous boron may be obtained by the reduction of $B_{2} O_{3}$ at high temperature using sodium or magnesium
$B F_{6}^{-}$ not exist.

$B_{2} O_{3}$ is acidic oxide.

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Similar questions

Q. Graphite is used as a lubricant in machines because it has a very high melting point and also it :

How many numbers of statements are correct for [Q]?

(a) It is electron deficient.
(b) It is planar.
(c) Non-polar.
(d) It has

s p^{3}

hybridised atom
(e)

[Q] + T H F \to [S],

hybridisation of oxygen atom is same in [S].

Choose the correct answer from the choices A, B, C and D :

(i) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(ii) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

Choose the correct answer from the choices (a), (b), (c) and (d):
(i) The property which is characteristic of an electrovalent compound is that:
(a) it is easily vaporized
(b) it has a high melting point
(c) it is a weak electrolyte
(d) it often exists as a liquid.

(ii) When a metal atom becomes an ion:
(a) it loses electrons and is oxidised
(b) it gains electrons and is reduced
(c) it gains electrons and is oxidised
(d) it loses electrons and is reduced.

S i O_{2}

is a covalent solid. Which of the following is most likely to be true regarding

S i O_{2}

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Boron is a fairly rare element however, it has many important application. It is a non-metal and has a very high melting point of 2180°C. It is extracted from borax and it form a large number of electron deficient compound. Select the correct statement(s)

The correct option is B Amorphous boron may be obtained by the reduction of B2O3 at high temperature using sodium or magnesiumBF−6 not exist. B2O3 is acidic oxide.

Boron is a fairly rare element however, it has many important application. It is a non-metal and has a very high melting point of 2180°C. It is extracted from borax and it form a large number of electron deficient compound.

Select the correct statement(s)

The correct option is B Amorphous boron may be obtained by the reduction of $B_{2} O_{3}$ at high temperature using sodium or magnesium
$B F_{6}^{-}$ not exist.

$B_{2} O_{3}$ is acidic oxide.