Boron cannot form which one of the following anion | Chemistry Questions & Answers

Q:

The structure of $I F^{7}$ is

A) Pentagonal bipyramid	B) Square pyramid
C) Trigonal bipyramid	D) Octahedral

Answer & Explanation Answer: A) Pentagonal bipyramid

Explanation:

Hybridisation of iodine is $s p^{3} d^{3}$

So, the structure is pentagonal bipyramid.

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1 3871

Q:

The outer electron configuration of Gd (Atomic No : 64) is

1. $4 f^{7} 5 d^{1} 6 s^{2}$

2. $4 f^{3} 5 d^{5} 6 s^{2}$

3. $4 f^{8} 5 d^{0} 6 s^{2}$

4. $4 f^{4} 5 d^{4} 6 s^{2}$

Answer

Answer : 1

Sol :

1. $4 f^{7} 5 d^{1} 6 s^{2}$

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19 9071

Q:

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)

A) 204.60 g	B) 304.30 g
C) 804.32 g	D) 400.00 g

Answer & Explanation Answer: C) 804.32 g

Explanation:

$∆ T_{f} = k_{f} . m$

for ethylene glycol in aq. solution

$∆ T_{f} = k_{f} \frac{w}{m o l . w t} \times \frac{1000}{w t . o f s o l v e n t} 6 = \frac{1.86 x w x 1000}{62 x 4000}$

=> w = 800 g

So, the weight of solute should be more than 800 g.

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Q:

The magnetic moment (spin only) of $[N i C l_{4}]^{2 -}$ is

A) 1.41 BM	B) 1.82 BM
C) 5.46 BM	D) 2.82 BM

Answer & Explanation Answer: D) 2.82 BM

Explanation:

Hybridisation of Ni is $e^{-}$

Unpaired $3 d^{8}$ in is 2

So $Ω = \sqrt{n (n + 2)} B M = \sqrt{2 x 4} = \sqrt{8} = 2.82 B M$

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10 6541

Q:

The element that has the highest first ionization potential is.......

A) Oxygen	B) Carbon
C) Boron	D) Nitrogen

Answer & Explanation Answer: D) Nitrogen

Explanation:

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9 4921

Q:

The maximum number of hydrogen bonds in a water molecule is...........

A) 1	B) 3
C) 4	D) 2

Answer & Explanation Answer: C) 4

Explanation:

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10 5715

Q:

Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen.......

A) Law of conservation of mass	B) Law of multiple proportion
C) Law of reciprocal proportions	D) Law of definite proportions

Answer & Explanation Answer: B) Law of multiple proportion

Explanation:

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4 3166

Q:

The oldest known organic compound is

A) Urea	B) Methane
C) Acetic acid	D) Benzene

Answer & Explanation Answer: C) Acetic acid

Explanation:

In the form of vinegar, acetic acid is known from very early times. It is got by oxidation of fermented liquors (10-15%, alcohol) by air under the influence of a bacteria called 'mycoderma acetic'

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A) Option 1	B) Option 2
C) Option 3	D) Option 4

Boron cannot form which one of the following anions?

(1) $B O_{2}^{-}$

(2) $B F_{6}^{3 -}$

(3) $B H_{4}^{-}$

(4) $B (O H)_{4}^{-}$

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Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4-

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Boron cannot form which one of the following anions?

(1) $B O_{2}^{-}$

(2) $B F_{6}^{3 -}$

(3) $B H_{4}^{-}$

(4) $B (O H)_{4}^{-}$