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

Q:

What is the common characteristic of the elements of the same group in the periodic table?

A) Electrons in outer most shell	B) Total number of electrons
C) Total number of protons	D) Atomic weight

Answer & Explanation Answer: A) Electrons in outer most shell

Explanation:

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Q:

What is the common name of CaOCl2?

A) Baking Powder	B) Baking Soda
C) Bleaching Powder	D) Washing Soda

Answer & Explanation Answer: C) Bleaching Powder

Explanation:

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Q:

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".

As feared, (differences into) the families pose a hurdle.

A) difference into	B) difference as in
C) difference amongst	D) No improvement

Answer & Explanation Answer: C) difference amongst

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Q:

Which of the following is not an example of Allotrope?

A) Diamond	B) Graphite
C) Ozone	D) Steel

Answer & Explanation Answer: D) Steel

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Q:

The molecular mass of sulphuric acid is 98. If 49 g of the acid is dissolved in water to make one litre of solution, what will be the strength of the acid?

A) Two normal	B) One normal
C) 0.5 normal	D) Four normal

Answer & Explanation Answer: B) One normal

Explanation:

Normality is a way of expressing concentration of a solution and can be calculated by the formula-

Normality (N) = No. of gram equivalent of solute/ volume of solution (in litre)

Gram equivalent weight of H2 SO4 = Molecular weight/ No. of Hydrogen atom = 98/2 = 49 gm

No. of gram equivalent in 49 gm of H2 SO4 = 1

So, Normality in 1 litre of solution = 1/1 = 1 N

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Q:

Which one of the following statements is not correct?

A) The cathode rays originate from cathode and proceed towards the anode in a cathode-ray discharge tube.	B) The television picture tubes are nothing but cathode ray tubes.
C) The cathode rays themselves are not visible.	D) The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.

Answer & Explanation Answer: D) The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.

Explanation:

Cathode ray is a beam of electrons emitted from the cathode of a vacuum tube. It is invisible. Cathode ray tubes are also found in televisions and computer monitors. Since cathode ray is a beam of electrons and all electrons are identical, charge to mass ratio is same for all the gases and does not depend on the nature of gas.

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Q:

The chemical properties of an element depend upon

A) the number of isotopes of the element	B) the mass number of the element
C) the total number of neutrons in the element	D) the number of electrons in the outermost shell of the element

Answer & Explanation Answer: D) the number of electrons in the outermost shell of the element

Explanation:

Chemical properties of an element depend on the number and the configuration of their (valence) electrons.

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Q:

What is the maximum number of states of matter?

A) Three	B) Four
C) Five	D) Variable

Answer & Explanation Answer: C) Five

Explanation:

There are five known states of matter: solids, liquids, gases, plasma and Bose-Einstein condensates. The main difference in the structures of each state is in the densities of the particles.

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