Ncert Solutions Chemistry Class 12th

The reaction of H₂O₂ with potassium permanganate in acidic medium leads to the formation of mainly.

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$2 M n O_{4}^{-} + 6 H^{+} + 5 H_{2} O_{2} \to 2 M n^{2 +} + 8 H_{2} O + 5 O_{2}$

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The compound(s) that is (are) removed as slag during the extraction of copper is:

(A) CaO

(B) FeO

(C) Al₂O_{3 &n}

...more

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$F e O + \underset{(A c i d i c f l u x)}{S i O_{2}} \to \underset{(S l a g)}{F e S i O_{3}}$

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The IUPAC nomenclature of an element with electronic configuration [Rn] 5f¹⁴6d¹7s² is:

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IUPAC nomenclature of element with atomic no. 103 is uniltrium.

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Match the List-I with List-II

List-I	List-II
(A) N₂(g) + 3H₂(g) -> 2NH₃(g)	(I) Cu
(B) CO(g) + 3H₂(g) -> CH₄(g) + H₂O(g)	(II) Cu/ZnO – Cr₂O₃
(C) CO(g) + H₂(g) -> HCOH(g)	(III) Fe_xO_y + K₂O + Al₂O₃
(D) CO(g) + 2H₂(g) -> CH₃OH(g)	(IV) Ni

Choose the correct answer from the options given below:

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Uses of catalyst is very specific for a particular reaction.

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Match List I with List II:

List I (molecule)		List II (hybridization; shape)
A.	XeO₃	I.	sp³d; linear
B.	XeF₂	II.	sp³; pyramidal
C.	XeOF₄	III.	sp³d³; distorted octahedral
D.	XeF₆	IV.	sp³d³; square pyramidal

Choose the correct answer from the options given below

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Payal Gupta

Contributor-Level 10

$X e O_{3} \Rightarrow s p^{3}, P y r a m i d a l$

XeF₂ sp³d₂, square pyramidal

XeF₆sp³d³, Distorted octahedral

XeOF₄ sp³d², square pyramidal

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SO₂Cl₂ on reaction with excess of water results into acidic mixture

SO₂Cl₂ + H₂O -> H₂SO₄ + 2HCl

16 moles of NaOH is required for the complete neutralization of the resultant acidic mixture. The number of moles of SO₂Cl₂ used is:

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$S O_{2} C l_{2} + 2 H_{2} O \to H_{2} S O_{4} + 2 H C l$

Let a moles of SO2Cl2 is taken

Then no. of moles of H2SO4 = a moles

No. of moles of HCl = 2a moles

No. of moles of NaOH required = 2a + 2a = 4a = 16

$\Rightarrow a = 4 m o l e s$

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The total number of Mn = O bonds in Mn₂O₇ is________.

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Number of Mn = O bonds = 6

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Given below are two statements.

Statement I: Iron (III) catalyst, acidified K₂Cr₂O₇ and neutral KMnO₄ have the ability to oxidize I^- to I₂ independently.

Statement II: Magnate ion is paramagnetic in nature and involves pp-pp bonding

In the light of the above statements, choose the most appropriate answer from the options given below.

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Neutral KMnO₄ oxidises I^- to and magnate ion has dpPp bonding

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Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

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Pyrophosphorous acid = H₄P₂O₅

Hypophosphorous acid = H₄P₂O₆

Phosphoric acid = H₃PO₄

Pyrophosphoric acid = H₄P₂O₇

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Which of the following methods are not used to refine any metal?

(A). Liquation

(B). Calcination

(C). Electrolysis

(D). Leaching

(E). Distillation

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