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Chemistry

Lyophilic sols are more stable than lyophobic sols because :

Which one of the following is the major product of the given reaction ?

The compound/s which will show significant intermolecular H-bonding is/are :

The major product of the following reaction, if it occurs by \( \mathrm{S_{N}2} \) mechanism is :

Choose the correct statement from the following :

Given below are two statements :
Statement-I : Ethyl pent-\( 4 \)-yn-oate on reaction with \( \mathrm{CH_3MgBr} \) gives a \( 3^\circ \)-alcohol.
Statement-II : In this reaction one mole of ethyl pent-\( 4 \)-yn-oate utilizes two moles of \( \mathrm{CH_3MgBr} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

Hydrolysis of sucrose gives :

Which of the following reactions will not yield propionic acid ?

The correct structures of A and B formed in the following reactions are :

The correct order of ionic radii for the ions, \( \mathrm{P^{3-}}, \ \mathrm{S^{2-}}, \ \mathrm{Ca^{2+}}, \ \mathrm{K^+}, \ \mathrm{Cl^-} \) is :

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at \( 803 \, \text{K} \)?

Which one of the following tests used for the identification of functional group in organic compounds does not use copper reagent ?

The oxide that gives \( \mathrm{H_2O_2} \) most readily on treatment with \( \mathrm{H_2O} \) is:

Potassium permanganate on heating at \( 513 \, \mathrm{K} \) gives a product which is:

The major product (A) formed in the reaction given below is:

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

Which one of the following chemicals is responsible for the production of \( \mathrm{HCl} \) in the stomach leading to irritation and pain?

Match List-I with List-II.

Choose the most appropriate answer from the options given below:

In stratosphere most of the ozone formation is assisted by :

The addition of dilute \( \mathrm{NaOH} \) to \( \mathrm{Cr^{3+}} \) salt solution will give :

The number of photons emitted by a monochromatic (single frequency) infrared range finder of power \( 1 \,\mathrm{mW} \) and wavelength of \( 1000 \,\mathrm{nm} \), in \( 0.1 \) second is \( x \times 10^{13} \). The value of \( x \) is _______. (Nearest integer)
\( (h = 6.63 \times 10^{-34} \,\mathrm{J\,s}, \; c = 3.00 \times 10^{8} \,\mathrm{m\,s^{-1}}) \)

The first order rate constant for the decomposition of \( \mathrm{CaCO_3} \) at \( 700 \,\mathrm{K} \) is \( 6.36 \times 10^{-3} \,\mathrm{s^{-1}} \) and activation energy is \( 209 \,\mathrm{kJ\, mol^{-1}} \). Its rate constant (in \( \mathrm{s^{-1}} \)) at \( 600 \,\mathrm{K} \) is \( x \times 10^{-6} \). The value of \( x \) is _______. (Nearest integer)
[Given : \( R = 8.31 \,\mathrm{J\, K^{-1}\, mol^{-1}} \); \( \log 6.36 \times 10^{-3} = -2.19 \), \( 10^{-4.79} = 1.62 \times 10^{-5} \) ]

The number of optical isomers possible for \( [\mathrm{Cr(C_2O_4)_3}]^{3-} \) is _______.

The resistance of a conductivity cell with cell constant \( 1.14 \,\mathrm{cm^{-1}} \), containing \( 0.001 \,\mathrm{M} \) \( \mathrm{KCl} \) at \( 298 \,\mathrm{K} \) is \( 1500 \,\Omega \). The molar conductivity of \( 0.001 \,\mathrm{M} \) \( \mathrm{KCl} \) solution at \( 298 \,\mathrm{K} \) in \( \mathrm{S\,cm^2\, mol^{-1}} \) is _______. (Integer answer)

\( 40 \, \text{g} \) of glucose (Molar mass = \( 180 \)) is mixed with \( 200 \, \text{mL} \) of water. The freezing point of solution is _______ \( \text{K} \). (Nearest integer)
[Given : \( K_f = 1.86 \, \text{K} \, \text{kg} \, \text{mol}^{-1} \); Density of water = \( 1.00 \, \text{g} \, \text{cm}^{-3} \); Freezing point of water = \( 273.15 \, \text{K} \)]

Data given for the following reaction is as follows :
\( \mathrm{FeO}_{(s)} + \mathrm{C}_{(\text{graphite})} \longrightarrow \mathrm{Fe}_{(s)} + \mathrm{CO}_{(g)} \)

The minimum temperature in \( \text{K} \) at which the reaction becomes spontaneous is _______. (Integer answer)

The number of species having non-pyramidal shape among the following is _______.
\( (A) \; \mathrm{SO}_3 \quad (B) \; \mathrm{NO}_3^{-} \quad (C) \; \mathrm{PCl}_3 \quad (D) \; \mathrm{CO}_3^{2-} \)

\( 100 \, \text{g} \) of propane is completely reacted with \( 1000 \, \text{g} \) of oxygen. The mole fraction of carbon dioxide in the resulting mixture is \( x \times 10^{-2} \). The value of \( x \) is _______. (Nearest integer)
[Atomic weight : \( \mathrm{H} = 1.008 \); \( \mathrm{C} = 12.00 \); \( \mathrm{O} = 16.00 \)]

Two flasks \( \text{I} \) and \( \text{II} \) shown below are connected by a valve of negligible volume.

When the valve is opened, the final pressure of the system in bar is \( x \times 10^{-2} \). The value of \( x \) is _______. (Nearest integer)
[Assume : Ideal gas; \( 1 \, \text{bar} = 10^{5} \, \text{Pa} \); Molar mass of \( \mathrm{N}_2 = 28.0 \, \text{g mol}^{-1} \); \( R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1} \)]

When \( 5.1 \, \text{g} \) of solid \( \mathrm{NH}_4\mathrm{HS} \) is introduced into a two litre evacuated flask at \( 27^{\circ}\text{C} \), \( 20\% \) of the solid decomposes into gaseous ammonia and hydrogen sulphide. The \( K_p \) for the reaction at \( 27^{\circ}\text{C} \) is \( x \times 10^{-2} \). The value of \( x \) is _______. (Integer answer)
[Given : \( R = 0.082 \, \text{L atm K}^{-1} \text{mol}^{-1} \)]

JEE Main 2021 27th August Evening Shift

Physics Chemistry Mathematics

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Lyophilic sols are more stable than lyophobic sols because :