Ncert Solutions Chemistry Class 12th

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

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

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

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Benzene on nitration givens nitrobenzene in presence of HNO₃ and H₂SO₄ mixture, where:

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Consider the above reaction, compound B is :

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Product formed after EAS reaction (Coupling reaction)

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Cr²⁺ salt reaches with potassium iodide to give:

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Kl acts as a reducing agent for $C u^{2 +} [2 C u^{+ +} + 4 K l \to C u_{2} l_{2} + l_{2} + 4 K^{+}]$

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3 months ago

Compound A is converted to B on reaction with CHCl₃ and KOH. The compound B is toxic and can be decomposed by C. A, B and C respectively are:

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1° - Amine produced isocyanide (iso nitrile) compound with CHCl₃ and KOH

$R - N H_{2} + C H C l_{3} + 3 K O H \to R N C + 3 K C l + 3 H_{2} O$

(A0

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The correct order of their reactivity towards hydrolysis at room temperature is:

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High leaving tendency corresponds to high reactivity towards hydrolysis. Hence order is.

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3 months ago

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P₄O₁₀ (in 4:1 ratio) is:

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Anhydride of HNO₃ produced by the treatment of P₄O₁₀ (anhydring reagent) in ratio of 4 : 1 is N₂O₅ which is acidic in nature. $4 H N O_{3} + P_{4} O_{10} \to \underset{A c i d i c n a t u r e}{\underset{?}{2 N_{2} O_{5}}} + {(H P O_{3})}_{4}$

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Consider two chemical reactions (A) and (B) that take place during metallurgical process:

(A) $Z n C O_{3 (s)} \overset{Δ}{\to} Z n O_{(s)} + C O_{2 (g)}$

(B) $2 Z n S_{(s)} + 3 O_{2 (g)} \overset{Δ}{\to} 2 Z n O_{(s)} + 2 S O_{2 (g)}$

The correct option of names given to them respectively is:

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