NTA JEE Main 25th February 2021 Shift 2 - Chemistry

Which among the following species has unequal bond lengths?

The solubility of $$Ca(OH)_2$$ in water is:
[Given: The solubility product of $$Ca(OH)_2$$ in water $$= 5.5 \times 10^{-6}$$]

Water does not produce CO on reacting with:

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

The correct order of acid character of the following compounds is:

Correct statement about the given chemical reaction is:

The major product of the following reaction is:

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is:

Given below are two statements:
Statement I: The pH of rain water is normally ~5.6.
Statement II: If the pH of rain water drops below 5.6, it is called acid rain.
In the light of the above statements, choose the correct answer from the options given below:

Which one of the following statements is FALSE for hydrophilic sols?

The method used for the purification of Indium is:

The correct order of bond dissociation enthalpy of halogens is:

Given below are two statements:
Statement I: $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II: At room temperature the stable crystalline form of sulphur is monoclinic sulphur.
In the light of the above statements, choose the correct answer from the options given below:

The major components of German Silver are:

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?
(i) $$[FeF_6]^{3-}$$
(ii) $$[Co(NH_3)_6]^{3+}$$
(iii) $$[NiCl_4]^{2-}$$
(iv) $$[Cu(NH_3)_4]^{2+}$$

Given below are two statements:
Statement I: The identification of $$Ni^{2+}$$ is carried out by dimethyl glyoxime in the presence of $$NH_4OH$$.
Statement II: The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements, choose the correct answer from the options given below:

The major product of the following reaction is:
$$CH_3CH_2CH = CH_2 \xrightarrow[ Rh \text{ catalyst}]{H_2/CO}$$

What is 'X' in the given reaction?

Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?

Which of the following is correct structure of $$\alpha$$-anomer of maltose?

Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization energy of metal A in kJ mol$$^{-1}$$ is ______. (Rounded-off to the nearest integer)
[$$h = 6.63 \times 10^{-34}$$ Js, $$c = 3.00 \times 10^8$$ ms$$^{-1}$$, $$N_A = 6.02 \times 10^{23}$$ mol$$^{-1}$$]

Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in this process is ______ kJ mol$$^{-1}$$.
(Rounded-off to the nearest integer)
[Use $$R = 8.314$$ J mol$$^{-1}$$ K$$^{-1}$$]

Consider titration of NaOH solution versus 1.25 M oxalic acid solution. At the end point following burette readings were obtained.
(i) 4.5 mL (ii) 4.5 mL (iii) 4.4 mL (iv) 4.4 mL (v) 4.4 mL
If the volume of oxalic acid taken was 10.0 mL then the molarity of the NaOH solution is ______ M. (Rounded-off to the nearest integer)

Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is ______. (Integer answer)
(A) Li (B) Na (C) Rb (D) Cs

The unit cell of copper corresponds to a face centered cube of edge length 3.596 $$\mathring{A}$$ with one copper atom at each lattice point. The calculated density of copper in kg/m$$^3$$ is ______. [Molar mass of Cu: 63.54 g; Avogadro Number $$= 6.022 \times 10^{23}$$]

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ______ molal. (Rounded-off to the nearest integer)
[$$K_b = 0.52$$ K kg mol$$^{-1}$$].

Copper reduces $$NO_3^-$$ into NO and $$NO_2$$ depending upon the concentration of $$HNO_3$$ in solution. (Assuming fixed $$[Cu^{2+}]$$ and $$P_{NO} = P_{NO_2}$$), the $$HNO_3$$ concentration at which the thermodynamic tendency for reduction of $$NO_3^-$$ into NO and $$NO_2$$ by copper is same is $$10^x$$ M. The value of $$2x$$ is ______. (Rounded-off to the nearest integer)
[Given, $$E^\circ_{Cu^{2+}/Cu} = 0.34$$ V, $$E^\circ_{NO_3^-/NO} = 0.96$$ V, $$E^\circ_{NO_3^-/NO_2} = 0.79$$ V and at 298 K, $$\frac{RT}{F}(2.303) = 0.059$$]

The rate constant of a reaction increases by five times on increase in temperature from 27°C to 52°C. The value of activation energy in kJ mol$$^{-1}$$ is ______. (Rounded-off to the nearest integer) [$$R = 8.314$$ J K$$^{-1}$$ mol$$^{-1}$$]

The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is ______ BM.

The number of compound/s given below which contain/s $$-COOH$$ group is ______. (Integer answer)
(A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid