in which of the following reaction boron does not as reducing agent ? (1) B+CO2--> (2) B+ Mg--> (3) B+ SiO2 --> (4) B+ HNO3--

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Q. In which of the following reaction, Boron does not act as reducing agent ?

M g

on reaction with

C O_{2}

gives A and gas B.

Identify A, B and the reducing and the oxidizing agents in the following above reaction.

Which of the following option is correct according to the following table?

$\begin{matrix} 1 & C a t i o n & A & P O_{4}^{3 -} 2 & A n i o n & B & M a n g a n e s e d i o x i d e 3 & O x i d i s i n g A g e n t & C & C a r b o n 4 & R e d u c i n g A g e n t & D & N a^{+} \end{matrix}$

Q. Explain the following:
(i) Gallium has higher ionization enthalpy than aluminum.
(ii) Boron does not exist as

B^{3 +}

ion.
(iii) Aluminum forms

[A l F_{6}]^{3 -}

ion but boron does not form

[B F_{6}]^{3 -}

ion.
(iv)

P b X_{2}

is more stable than

P b X_{4}

(v)

P b^{4 +}

acts as an oxidizing agent, but

S n^{2 +}

acts as a reducing agent.
(vi) Electron gain enthalpy of chlorine is more negative as compared to fluorine.
(vii)

T I (N O_{3})_{3}

acts as an oxidizing agent.
(viii) Carbon shows catenation property but lead does not.
(ix)

B F_{3}

does not hydrolyze.
(x) Why does the element silicon, not form a graphite-like structure whereas carbon does?

Q. In the following reaction :

A^{+} + B \to A + B^{+}

A reducing agent is:

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