Ncert Solutions Chemistry Class 11th

Out of the following oxides of nitrogen how many of them are neutral oxides?

N₂O, NO, N₂O₃ , NO₂ , N₂O₄, N₂O₅

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N₂O&NO

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4 weeks ago

What is the formula and method of preparation of Hypophosphoric oxyacid?

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Red phosphorus undergoes disproportionation on reaction with alkali to form H₄P₂O₆ and PH₃

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The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

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Peroxyacetyl nitrate is a secondary air pollutant

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How many of these compounds will undergo disproportionation on hydrolysis? CO?, NO?, Cl?, F?, ClO?, Cl?O?, N?O?, SO?, P?O?

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$\overset{\overset{+ 4}{{N O}_{2}}}{2} + H_{2} O \to \overset{+ 3}{{H N O}_{2}} + \overset{+ 5}{H N O}_{3}$

$\overset{0}{{C l}_{2}} + H_{2} O \to \overset{- 1}{H C l} + H O C l$

$2 \overset{+ 4}{{C l O}_{2}} + H_{2} O \to \overset{+ 3}{{H C l O}_{2}} + \overset{+ 5}{{H C l O}_{3}}$

$\overset{+ 6}{{C l}_{2}} O_{6} + H_{2} O \to \overset{+ 5}{{H C l O}_{3}} + \overset{+ +^{+}}{{C l O}_{4}}$

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Which of the following statement is incorrect statement for photochemical smog?

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Photochemical smog has high concentration of oxidising agent like ${N O}_{2}$ $_{}$ and $_{}$ $O_{3}$ and is therefore called as oxidising agent.

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Consider the following reaction:
(A substituted phenol reacts with H? and CrO?Cl to produce product 'P'.)
The product 'P' gives positive acetyl chloride test. This is because of the presence of which of these –OH group(s)?

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Kindly consider the following Image

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4 weeks ago

Maximum number of different photons emitted when only two H atoms are placed in a container and each is present in 3rd excited state:

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$1^{st} H$ - atom

$n = 4$

$n = 1$

$4 \to 3,3 \to 2,2 \to 1$

$4 \to 1$ or $4 \to 3,3 \to 1$

or $4 \to 2,2 \to 1$

Hence, number of different lines possible $= 3 + 1 = 4$

Minimally, both can have same transition i.e $4 \to 1$ etc.

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Among the following statements, identify the correct set of statements:
(A) Size of Li is smaller than Mg
(B) Both Li and Mg form covalent compounds readily
(C) Both Li and Mg react with nitrogen and form nitride
(D) Oxides of Li and Mg do not combine with excess oxygen to give superoxides

Identify the correct option from below:

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200ml of 0.5M solution of CuBr₂ was electrolysed using Pt as electrodes with a current of 0.965 ampere in one hour, what is the normality of the remaining CuBr₂ solution assuming no change in volume?

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Contributor-Level 10

Initial m equivalent of Cu²? = 200 * 0.5 * 2 = 200 m eq
So electricity passed = (0.965*3600)/96500 = 36 * 10? ³ eq. = 36 m eq
m eq CuBr? remaining = 200 – 36 = 164 ∴ N = meq / V (in ml) = 164/200 = 0.82

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How much propyl alcohol must be added to 1.00lt. of water so the solution will not freeze at –15°C ? (K_f of water = 1.86 KKgmol^-1)[d(H₂O) = 1 g/ml and molecular mass of propyl alcohol = 60 g/mol ]

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