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Class 12th Chemistry

Orlon fibres are made up of:

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alok kumar singh

Contributor-Level 10

Orlon fibres are the polymer of acrylonitrile

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Class 12th Chemistry

In the given reaction 3-Bromo-2, 2-dimethyl butane $\overset{C_{2} H_{5} O H}{\to} \underset{(M a j o r P r o d u c t)}{' A'}$ Product A is:

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alok kumar singh

Contributor-Level 10

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Class 12th Organic Chemistry - Some Basic Principles and Tech

Which one of the following pairs of isomers is an example of metamerism?

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Vishal Baghel

Contributor-Level 10

In metamers, distribution of alkyl groups are changed with respect to polyvalent functional groups.

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Class 12th Chemistry

Which one of the following species doesn't have a magnetic moment of 1.73BM. (spin only value)?

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Vishal Baghel

Contributor-Level 10

ln $C u l, C u^{+} h a s 3 d^{10} 4 s^{0}, [n = 0 a n d μ = 0 B M]$

ln $[C u {(N H_{3})}_{4}] C l_{2}, C u^{+ +} h a s 3 d^{9} 4 s^{0} [n = 1 a n d μ = 1.73 B M]$

$l n O_{2}^{-} & {O_{2}}^{+}$ only one electron is unpaired in anti bonding MO,

Hence [n = 1 and $μ$ = 1.73 BM]

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Class 12th Chemistry Coordination Compounds

According to the valence bond theory the hybridization of central metal atom is dsp² for which one of the following compounds?

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alok kumar singh

Contributor-Level 10

$K_{2} [N i {(C N)}_{4}]$

$N i^{2 +} \to 3 d^{8} 4 s^{0}$

dsp² hybridisation

Paring developed due to strong ligand effect.

NiCl₂.6H₂O

Ni²⁺ ->3d⁸4s⁰

Na₂ [NiCl₄]

Ni²⁺ -> 3d⁸4s⁰

[Ni (CO)₄]

Ni->3d⁸4s²

Paring developed due to strong ligand (CO).

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Class 12th English

The passage given below is followed by four alternate summaries. Choose the option that best captures the essence of the passage.

Legal emission limits have been long contested by developers, and are widely ignored. Smoky funeral pyres are lit, and piles of rubbish are regularly burned very close to the buildings. Pollution from the Yamuna River presents a further challenge. Untreated sewage and industrial waste pour in from the city, creating nutrient-rich waters. These nutrients are then picked up by the wind and deposited in the Taj's increasingly porous stonework, allowing river-derived microorganisms to thrive on its surfaces, col

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Payal Gupta

Contributor-Level 10

Option C describes both water and air pollution clearly in the statement as the root cause of the change in the color of the stonework of the Taj Mahal.

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Class 12th Chemistry

The conditions given below are in the context of observing Tyndall effect in colloidal solutions:

(A) The diameter of the colloidal particles is comparable to the wavelength of light used.

(B) The diameter of the colloidal particles in much smaller than the wavelength of light used.

(C) The diameter of the colloidal particles is much larger than the wavelength of light used.

(D) The refractive indies of the dispersed phase and the dispersion medium are comparable.

(E) The dispersed phase has a very different refractive index from the dispersion medium.

Choose the most appropriate conditions form the options given belwo.

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alok kumar singh

Contributor-Level 10

Tyndall effect is the optical characteristics of light in which comparable particle size of colloids and bombarded light wavelength can produce this type of effect. For scattering effect of light in Tyndall effect refractive index of dispersed phase and dispersion medium should be greatly different.

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Class 12th Chemistry

The metal that can be purified economically by fractional distillation method is:

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alok kumar singh

Contributor-Level 10

Due to volatile nature, Zn – metal can be economically purified by fractional distillation refining process.

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Class 12th Chemistry

The metal that can be purified economically by fractional distillation method is:

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New answer posted

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Class 12th English

The four sentences (labelled 1, 2, 3 and 4) below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and choose the correct option.

1. Teacher Unions have welcomed this campaign and the opportunity has already come and gone for the Indian Government additionally to think on comparable lines and find a way to lift up the sinking assurance of the teaching profession.

2. An amount of $100 million has been put aside to battle the shortage of candidates for the teacher training.

3. They have additionally requested that the campaign ought to be coordinated by improved co

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Payal Gupta

Contributor-Level 10

2^ndsentence introduces the problem and 4^th sentence further extends the solution for that problem. In the 3^rd sentence, 'they' refers to the notices and the word 'campaign' connects with the 1^st sentence.

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