Chemistry

Contributor-Level 10

$[N H_{4} C l] = \frac{2}{60} = \frac{1}{30} M$

$p H = 7 - \frac{1}{2} P K_{b} - \frac{1}{2} l o g C$

$= 7 - \frac{5}{2} - \frac{1}{2} l o g (\frac{1}{30}) = 5.24$

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Chemistry Solutions

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L-1 is $0.0405 ° C .$ Density of formic acid is 1.05 g mL-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water $K_{f} = 1.86 k k g m o l^{- 1}$ $_{}^{}$ )

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Contributor-Level 10

Let we take of solution

Mass of solute = Volume * Density

= 0.5 $m l * 1.05 g m / m l$

= 0.525 gram

Mass of solution = 1 kg. [considering very dilute solution]

Mass of solvent = 1000 – 0.525 = 999.475 gram

$\Rightarrow i = 1.9$

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Chemistry Structure of Atom

Which of the following sets of quantum numbers is not allowed?

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Contributor-Level 10

Value of n & $l$ can't be same

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Chemistry Class 11th

Given below are two statements. One is labeled as Assertion A and, the other is labeled as Reason R.

Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, as respectively aromatic, not-aromatic and aromatics.

Reason R: Planarity is one of the requirements of aromatic systems.

In the light of the above statements, choose the correct answer from the options given below:

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Contributor-Level 10

Please find the solution below:

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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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Contributor-Level 10

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

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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Chemistry Class 11th

Match List I with List II.

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Contributor-Level 10

(A) Sulphate (>500 ppm) ® causes laxative effect that leads to dehydration.

(B) Nitrate (> 50 ppm) ® causes methemoglobinemia, skin appears blue.

(D) Fluoride (>2ppm) ® It causes brown mottling of teeth.

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

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Contributor-Level 10

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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Contributor-Level 10

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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