Chemistry

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half – life of 3.33 h at 25°C. After 9h, the fraction of sucrose remaining is f. The value of log₁₀ $(\frac{1}{f})$ is………………….* 10^-². (Rounded off to the nearest integer)

[Assume: In 10 = 2.303, In2 = 0.693]

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$C_{12} H_{22} O_{11} + H_{2} O \to \underset{G l u c o s e}{C_{6} H_{12} O_{6}} + \underset{F r u c t o s e}{C_{6} H_{12} O_{6}}$

$K = \frac{2.303}{t} l o g \frac{a}{a - x}$

$\frac{k t}{2.303} = l o g \frac{a}{a - x}$

$\frac{l n 2 * 9}{\frac{10}{3} * 2.303} = l o g (\frac{1}{f})$

$l o g (\frac{1}{f}) = 81.24 * 1 0^{- 2} = 81 * 1 0^{- 2}$

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The total number of amines among the following which can be synthesized by Gabriel synthesis is………………

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Gabriel phthalimide synthesis is used for 1° Aliphatic /alicyclic amine

1° Amine

CH₃ – CH₂ – NH₂

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Which of the following reagent is suitable for the preparation of the product in the above reaction?

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Kindly consider the following figure

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The correct shape and I – I – I bond angles respectively in ion are:

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Kindly consider the following figure

Linear (180°)

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The correct shape and I – I – I bond angles respectively in ion are:

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Match List – I with List – II

List – I (salt) List – II (Flame colour wavelength)

(a) LiCl

...more

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Li -> Crimson Red

Na -> Yellow

Rb -> Red violet

Cs -> Blue

VIBGYOR

Wavelength

Red violet > Crimson Red > Yellow > Blue

$↓$ $↓$ $↓$ $↓$

780 nm 670.8 nm 589.2 nm 455.5 nm

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According to Both's atomic theory:

(A) Kinetic energy of electron is $\frac{z^{2}}{n^{2}}$

(B) The product of velocity (v) of electron and principal quantum number (n) 'vn' Z²

(C) Frequency of revolution of electron in an orbit is $\frac{Z^{3}}{n^{3}}$

(D) Coulombic force of attraction on the electron is $\frac{z^{3}}{n^{4}}$

Choose the most appropriate answer from the options given below:

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According to Bohr's theory,

$K . E . = 13.6 \frac{z^{2}}{n^{2}}$ frequency $(υ)$ of revolution of electron $\propto \frac{z^{2}}{n^{3}}$

$v = 2.18 * 1 0^{6} \frac{z}{n}$

$F = \frac{k q_{1} q_{2}}{r^{2}} = \frac{K z e^{2}}{r^{2}} (r \propto \frac{n^{2}}{z})$

$F \propto \frac{z^{3}}{n^{4}}$

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The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is:

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Chemistry Environmental chemistry

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If we add -NO₂ group on ortho and para position, then electron deficiency increasing in benzene ring so, order of nucleophilic attack is

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Given below are two statements:

Statement I : The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for survival of aquatic life.

Statement II : The optimum value of BOD is 6.5 ppm.

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

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Clean water would have BOD Value less than 5ppm, highly polluted water could have BOD value of 17 ppm or more.

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The diazonium salt of which of the following compounds will form a coloured dye on reaction with β-Naphthol in NaOH?

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