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Standard IX

Chemistry

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In [B4O5OH4]2...

Question

In $[B_{4} O_{5} (O H)_{4}]^{2 -},$ the number of boron atoms having an octet of electron is:

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Solution

The correct option is C $2$

In $[B_{4} O_{5} (O H)_{4}]^{2 -}$ as shown in the diagram, the terminal $B$ atoms have only $6$ electrons in its valence shell and the $B$ atoms those are connected through a bridging oxo group have a complete octet of electrons.

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Similar questions

Q. In

(B_{4} O_{5} (O H)_{4})^{2 -}

the number of boron atoms having an octet of elelctron is:

Q. Borax is correctly represented as

N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O

. Number of tetrahedral boron atoms present are

x

and number of

B - O - B

bonds are

y

. The value of

\frac{y}{x}

In the tetranuclear unit of borax $[B_{4} O_{5} (O H)_{4}]^{2 -}$ , the number of B – O – B bridges formed between $s p^{3}$ boron & $s p^{2}$ boron is ‘x’ and the number B-O-B bridges formed between $s p^{3}$ boron & $s p^{3}$ boron is ‘y’.
Then (x – y) is___

Q. Complete the following statements :

(a) Magnesium has 2 valence electrons in the ............. shell.

(b) The valency of nitrogen in N₂ molecule is .............

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called .............

Complete the following statements :

(a) Magnesium has 2 valence electrons in the ___ shell.

(b) The valency of nitrogen in $N_{2}$ molecule is ___

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called ___

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In [B4O5(OH)4]2−, the number of boron atoms having an octet of electron is:

The correct option is C 2 In [B4O5(OH)4]2− as shown in the diagram, the terminal B atoms have only 6 electrons in its valence shell and the B atoms those are connected through a bridging oxo group have a complete octet of electrons.

In $[B_{4} O_{5} (O H)_{4}]^{2 -},$ the number of boron atoms having an octet of electron is:

The correct option is C $2$

In $[B_{4} O_{5} (O H)_{4}]^{2 -}$ as shown in the diagram, the terminal $B$ atoms have only $6$ electrons in its valence shell and the $B$ atoms those are connected through a bridging oxo group have a complete octet of electrons.