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Ncert Solutions Chemistry Class 11th

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Ncert Solutions Chemistry Class 11th Class 11th

The photochemical smog does not generally contain

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Vishal Baghel

Contributor-Level 10

Photochemical smog generally does not content SO₂ gas.

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Ncert Solutions Chemistry Class 11th Class 11th

The interhalogen compound formed from the reaction of bromine with excess of fluorine is:

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Vishal Baghel

Contributor-Level 10

$B r_{2} + 5 F_{2} (e x c e s s) \to 2 B r F_{5}$

$B r F_{5} + 3 H_{2} O \to H B r O_{3} + 5 H F$

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Ncert Solutions Chemistry Class 11th Class 11th

The geometry around boron in the product 'B' formed from the following reaction is

$B F_{3} + N a H \overset{450 K}{\to} A + N a F$

A + NMe₃ $\overset{}{\to} B$

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Vishal Baghel

Contributor-Level 10

$2 B F_{3} + 6 N a H \to B_{2} H_{6} + 6 N a F$

$B_{2} H_{6} + 2 \ddot{N} {(M e)}_{3} \to 2 H_{3} B \leftarrow : N {(M e)}_{3}$

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Ncert Solutions Chemistry Class 11th Class 11th

Choose the correct order of density of the alkali meals:

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Vishal Baghel

Contributor-Level 10

Density of metal a very specific and depends upon many factors.

Li -> 0.53 gm/cm³

Na -> 0.97 gm/cm³

K -> 0.86 gm/cm³

Rb ->1.53 gm/cm³

Cs -> 1.90 gm/cm³

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Ncert Solutions Chemistry Class 11th Class 11th

Match List I with List II.

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alok kumar singh

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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Ncert Solutions Chemistry Class 11th NCERT Class 12 Chemistry

Given below are two statements.

Statement I: The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.

Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions.

In the light of the above statements, choose the correct answer form the options given below.

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alok kumar singh

Contributor-Level 10

Be₂Cl₄ is Lewis acid and Al₂Cl₆ has complete octet. Be and Al are amphoteric metal therefore dissolve in acid as well as alkaline solution and form beryllate and aluminate ions in excess alkali.

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Ncert Solutions Chemistry Class 11th Class 11th

Given below are two statements.

Statement I: Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.

Statement II: Density of hydrogen peroxide at 298 K is lower than that of D₂O.

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

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alok kumar singh

Contributor-Level 10

Depending on the nature of reducing agent H₂O₂ can act as oxidizing agent in both acidic as well as basic medium.

Density of D₂O = 1.1 gm/cc

Density of D₂O₂ = 1.45 gm/cc

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Ncert Solutions Chemistry Class 11th Bond Parameters

Explain why the bond angle in ${N H}_{3}$ is larger than in ${P H}_{3}$ ?

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Himanshi Singh

Beginner-Level 5

The reason why bond angle is larger in ${N H}_{3}$ than ${P H}_{3}$ are given below.

In ${N H}_{3}$ , there is one lone pair on the nitrogen atom increases repulsion, while the lone pair on phosphorus is in a higher energy orbital and causes less repulsion.
Nitrogen is a small and electronegative atom whereas phosphorus is larger and less electronegative than nitrogen.
In ${P H}_{3}$ , the bonding orbitals are nearly pure p-orbitals, which are less directionals–p hybridization, on the other hand, the bond pairs remain fairly directed, leading to a larger bond angle.

Hence, the bond angle in ${N H}_{3}$ is about 107° ( less than the ideal tetrahedral 109.5°) due to lone pair pres

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The reason why bond angle is larger in ${N H}_{3}$ than ${P H}_{3}$ are given below.

In ${N H}_{3}$ , there is one lone pair on the nitrogen atom increases repulsion, while the lone pair on phosphorus is in a higher energy orbital and causes less repulsion.
Nitrogen is a small and electronegative atom whereas phosphorus is larger and less electronegative than nitrogen.
In ${P H}_{3}$ , the bonding orbitals are nearly pure p-orbitals, which are less directionals–p hybridization, on the other hand, the bond pairs remain fairly directed, leading to a larger bond angle.

Hence, the bond angle in ${N H}_{3}$ is about 107° ( less than the ideal tetrahedral 109.5°) due to lone pair presence and highly electronegative atom, and the bond angle in PH? ( 93.5°) is much smaller due to less repulsive lone pair, and less electronegative atom.

Hence, the bond angle in ${N H}_{3}$ (107°) is larger than in ${P H}_{3}$ (93.5°).

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Ncert Solutions Chemistry Class 11th Class 11th

Given below are two statements.

Statement I: In polluted water values of both dissolved oxygen and BOD are very low.

Statement II: Eutrophication results in decrease in the amount of dissolved oxygen.

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

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Vishal Baghel

Contributor-Level 10

(a) Polluted water has low value of dissolved oxygen, but high value of B.O.D., because chemical and organic matter uses dissolved oxygen to decompose.

(b) Eutrophication is result of excessive growth of weed in water bodies, which consumes dissolved oxygen, thus decreases oxygen.

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Ncert Solutions Chemistry Class 11th Class 11th

Which of the following has least tendency to liberate H₂ from mineral acids?

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Vishal Baghel

Contributor-Level 10

Cu is least reactive metal and it lies below hydrogen in reactivity series.

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