Li - H - 2 ongrightarrow P xrightarrow H - 2 O Q - R -gas P AlCl 3- S - LiClThe correct option is-A- Li - R - QB- Q is acidicC- S is a powerful reducing agentD- Al in AlCl 3 gets oxidised

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Standard XII

Chemistry

Chemical Reactivity (Group 1)

Li + H - 2 on...

Question

$L i + H_{2} ⟶ P H_{2} O - - \to Q + R_{g a s}$
$P A l C l_{3} - -- \to S + L i C l$
The correct option is:

L i + R ⟶ Q

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Q is acidic

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S is a powerful reducing agent

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A l

A l C l_{3}

gets oxidised

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Solution

The correct option is C S is a powerful reducing agent
Lithium being a group 1 element reacts with $H_{2}$ to form a hydride. So, P is $L i H$ which reacts violently with water to give lithium hydroxide (basic in nature) and hydrogen gas. $L i H$ reacts with $A l C l_{3}$ to form a reducing agent $L i A l H_{4}$ which is the product S.
$A l$ in $A l C l_{3}$ is in the same oxidation state with that of $A l$ in $L i A l H_{4}$ .

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$C o l u m n - I C o l u m n - I I A) Free radical substitution P) C H_{3} C H_{2} = C H_{2} + H B r O r g a n i c p e r o x i d e - --------- \to C H_{2} C H_{2} C H_{2} B r B) Electrophillic addition Q) C_{2} H_{5} O H H^{+} - - \to C_{2} H_{4} + H_{2} O C) Free radical addition R) Halogenation of alkanes D) Elimination S) C H_{3} C H = C H_{2} + H C l \to C H_{3} - C H - C H_{3} | C l$

\begin{matrix} List I & List II (A) N, F, O, Li & (P) Increasing order of |EA| (B) F, N, Si, Mg, Rb & (Q) Increasing order of {IE}_{1} (C) K, Na, Al, Mg & {(R) Increasing order of IE}_{2} (D) N, B, O, Cl & (S) Incresing order of radius \end{matrix}

Which of the following is the only CORRECT combination?

P h - C H_{2} - B r a q . N a O H - ----- \to P K M n O_{4} - ---- \to H^{+}, Δ Q N H_{3} - -- \to Δ R K O H, B r_{2} - ----- \to S

Compound S is :

Q. Choose the correct set of options matching appropriate properties of column-I with column-II

\begin{matrix} Column-I & Column-II (a) & X e F_{4} + H_{2} O (l) ⟶ & (p) & Shows disproportionation reaction (b) & P_{4} (s) + O H^{-} (a q) + H_{2} O (l) ⟶ & (q) & One of the products is a monobasic Lewis acid (c) & B_{2} H_{6} + H_{2} O (l) ⟶ & (r) & One/two of the products is/are gas(es) (d) & B r_{2} (g) + K_{2} C O_{3} (a q) ⟶ & (s) & One of the product has trigonal pyramidal structure (t) & One of the gaseous product is used as Holme's signal in sea \end{matrix}

For the reaction, PbO + H₂ → Pb + H₂O , Which of the following statements is incorrect?

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Li+H2⟶PH2O−−→Q+Rgas PAlCl3−−−→S+LiCl The correct option is:

$L i + H_{2} ⟶ P H_{2} O - - \to Q + R_{g a s}$
$P A l C l_{3} - -- \to S + L i C l$
The correct option is: