NTA JEE Main 2nd September 2020 Shift 2

Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are:

Arrange the following labelled hydrogens in decreasing order of acidity:

An organic compound 'A' $$(C_9H_{10}O)$$ when treated with conc. HI undergoes cleavage to yield compound 'B' and 'C'. 'B' gives yellow precipitate with $$AgNO_3$$ where as 'C' tautomerizes to 'D'. 'D' gives positive iodoform test. 'A' could be:

The major product of the following reaction is:

The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following process can explain this?

The results given in the below table were obtained during kinetic studies of the following reaction:
$$2A + B \to C + D$$

Amongst the following statements regarding adsorption, those that are valid are:
(a) $$\Delta H$$ becomes less negative as adsorption proceeds.
(b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas.
(c) On adsorption, the residual force acting along the surface of the adsorbent increases
(d) With increase in temperature, the equilibrium concentration of adsorbate increases.

Cast iron is used for the manufacture of:

Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of $$M^{+n}$$ ion are provided below; their $$\lambda_{max}$$ values are marked as A, B and C respectively. The correct match between the complexes and their $$\lambda_{max}$$ values is:

(i) $$[M(NCS)_6]^{(-6+n)}$$
(ii) $$[MF_6]^{(-6+n)}$$
(iii) $$[M(NH_3)_6]^{n+}$$

The one that is not expected to show isomerism is: