NTA JEE Main 24th June 2022 Shift 2 - Chemistry

$$120$$ g of an organic compound which contains only carbon and hydrogen on complete combustion gives $$330$$ g of $$CO_2$$ and $$270$$ g of water. The percentage of carbon and hydrogen in the organic compound are respectively

The energy of one mole of photons of radiation of wavelength $$300$$ nm is (Given :
$$h = 6.63 \times 10^{-34}$$ J s, $$N_A = 6.02 \times 10^{23}$$ mol$$^{-1}$$, $$c = 3 \times 10^{8}$$ m s$$^{-1}$$)

Metals generally melt at very high temperatures, Among the following which one has the highest melting point?

The correct order of bond orders of $$C_2^{2-}$$, $$N_2^{2-}$$ and $$O_2^{2-}$$ is

At $$25°$$C and 1 atm pressure, the enthalpies of combustion are as given below:

The enthalpy of formation of ethane is

Which one of the following compounds is used as a chemical in certain type of fire extinguishers

Arrange the following carbocations in decreasing order of stability.

Given below are two statements.
Statement I: The presence of weaker $$\pi$$-bonds make alkenes less stable than alkanes
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following reagents / reactions will convert 'A' to 'B'?

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

In the industrial production of which of the following, molecular hydrogen is obtained as a bye product.

For a first order reaction, the time required for completion of $$90\%$$ reaction is '$$x$$' times the half life of the reaction. The value of '$$x$$' is
(Given: $$\ln 10 = 2.303$$ and $$\log 2 = 0.3010$$)

Which of the following chemical reactions represents Hall-Heroult Process?

$$PCl_5$$ is well known but $$NCl_5$$ is not. Because,

Transition metal complex with highest value of crystal field splitting $$(\Delta_0)$$ will be

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is

The conversion of propan-1-ol to n-butylamine involves the sequential addition of reagents. The correct sequential order of reagents is

Which of the following is not a condensation polymer?

The structure shown below is of which well-known drug molecule?

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

At $$300$$ K, a sample of $$3.0$$ g of gas A occupies the same volume as $$0.2$$ g of hydrogen at $$200$$ K at the same pressure. The molar mass of gas A is ______ g mol$$^{-1}$$. (nearest integer) Assume that the behaviour of gases as ideal.
(Given: The molar mass of hydrogen ($$H_2$$) gas is $$2.0$$ g mol$$^{-1}$$.)

$$PCl_5$$ dissociates as $$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$$. $$5$$ moles of $$PCl_5$$ are placed in a $$200$$ litre vessel which contains $$2$$ moles of $$N_2$$ and is maintained at $$600$$ K. The equilibrium pressure is $$2.46$$ atm. The equilibrium constant $$K_p$$ for the dissociation of $$PCl_5$$ is ______ $$\times 10^{-3}$$. (nearest integer) (Given: $$R = 0.082$$ L atm K$$^{-1}$$ mol$$^{-1}$$; Assume ideal gas behaviour)

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ______

$$0.2$$ g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $$N_2$$ evolved (at STP) was found to be $$22.400$$ mL. The percentage of nitrogen in the compound is ______ [nearest integer] (Given: Molar mass of $$N_2$$ is $$28$$ g mol$$^{-1}$$, Molar volume of $$N_2$$ at STP: $$22.4$$ L)

A company dissolves '$$x$$' amount of $$CO_2$$ at $$298$$ K in $$1$$ litre of water to prepare soda water. $$X = $$ ______ $$\times 10^{-3}$$ g. (nearest integer)
(Given: partial pressure of $$CO_2$$ at $$298$$ K $$= 0.835$$ bar. Henry's law constant for $$CO_2$$ at $$298$$ K $$= 1.67$$ kbar. Atomic mass of H, C and O is $$1, 12,$$ and $$6$$ g mol$$^{-1}$$, respectively)

The resistance of a conductivity cell containing $$0.01$$ MKCl solution at $$298$$ K is $$1750$$ $$\Omega$$. If the conductivity of $$0.01$$ MKCl solution at $$298$$ K is $$0.152 \times 10^{-3}$$ S cm$$^{-1}$$, then the cell constant of the conductivity cell is ______ $$\times 10^{-3}$$ cm$$^{-1}$$

When $$200$$ mL of $$0.2$$ M acetic acid is shaken with $$0.6$$ g of wood charcoal, the final concentration of acetic acid after adsorption is $$0.1$$ M. The mass of acetic acid adsorbed per gram of carbon is ______ g.

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based? ______

In alanylglycylleucylalanylvaline the number of peptide linkages is: ______