Class 11th

Choose the correct order of density of the alkali meals:

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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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3 months ago

The measured BOD values for four different water sample (A-D) are as follows

A = 3 ppm; B = 18 ppm: C = 21 ppm; D = 4 ppm.

The water samples which can be called as highly polluted with organic wastes, are

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Contributor-Level 10

Highly polluted water has higher value of BOD ≥17 ppm

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3 months ago

Class 11th Equilibrium

20 mL of 0.1 M NH₄Oh is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (Given K_b (NH₄OH) = 1 * 10^-5, log2 = 0.30, log3 = 0.48, log5 = 0.69, log7 = 0.84, log11 = 1.04

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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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3 months ago

Which one of the following is an example of disproportionation reaction?

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Class 11th Structure of Atom

Contributor-Level 10

Disproportionation reaction is

$\overset{+ 6}{M g} O_{4}^{- -} + 4 H^{+} \to 2 \overset{+ 7}{M n} O_{4}^{-} + \overset{+ 4}{M n} O_{2} + 2 H_{2} O$

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3 months ago

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

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Contributor-Level 10

Kindly go through the solution

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

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The oxide which contains an odd electron at the nitrogen atom is

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Kindly consider the below image

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3 months ago

s-block element which cannot be qualitatively confirmed by the flame test is

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3 months ago

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

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Contributor-Level 10

During removal of temporary hardness of water.

$\begin{array}{l} M g {(H C O_{3})}_{2} \overset{B o i l}{\to} M g {(O H)}_{2} + 2 C O_{2} ↑ \\ C a {(H C O_{3})}_{2} \overset{B o i l}{\to} C a C O_{3} + H_{2} O + C O_{2} \end{array}$

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3 months ago

Identify the correct statement from B₂H₆ from those given below :

(A) In B₂H₆, all B-H bonds are equivalent

(B) In B₂H₆, there are four 3-centre 2- electron bonds

(C) B₂H₆ is a Lewis acid

(D) B₂H₆ can be synthesized from both BF₃ and NaBH₄.

(E) B₂H₆ is planar molecule.

Choose the most appropriate answer from the options given below :

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