NTA JEE Main 8th January 2020 Shift 2

A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H$$_2$$O gives a colourless gas which when passed through CuSO$$_4$$ solution gives a dark blue-violet coloured solution. A and B respectively, are:

The major product [B] in the following sequence of reactions is:

The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is:
(A) Ni(CO)$$_4$$
(B) [Ni(H$$_2$$O)$$_6$$]Cl$$_2$$
(C) Na$$_2$$[Ni(CN)$$_4$$]
(D) PdCl$$_2$$(PPh$$_3$$)$$_2$$

Two monomers in maltose are:

For the following Assertion and Reason, the correct option is:
Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason: The reactants are most strongly adsorbed on group 7-9 elements.

NaClO$$_3$$ is used, even in spacecrafts, to produce O$$_2$$. The daily consumption of pure O$$_2$$ by a person in 492 L at 1 atm, 300K. How much amount of NaClO$$_3$$, in grams, is required to produce O$$_2$$ for the daily consumption of a person at 1 atm, 300K?
NaClO$$_3$$(s) + Fe(s) $$\rightarrow$$ O$$_2$$(g) + NaCl(s) + FeO(s)
R = 0.082 L atm mol$$^{-1}$$ K$$^{-1}$$

At constant volume, 4 mol of an ideal gas when heated from 300K to 500K changes its internal energy by 5000J. The molar heat capacity at constant volume is

In the following sequence of reactions the maximum number of atoms present in molecule 'C' in one plane is __________.
A $$\xrightarrow[Cu tube]{\text{Red hot }}$$ B $$\xrightarrow[\text{Anhydrous AlCl}_3]{CH_3Cl(1 eq)}$$ C
(A is a lowest molecular weight alkyne)

For an electrochemical cell Sn(s)|Sn$$^{2+}$$(aq, 1M)||Pb$$^{2+}$$(aq, 1M)|Pb(s) the ratio $$\frac{[Sn^{2+}]}{[Pb^{2+}]}$$ when this cell attains equilibrium is __________.
(Given: E$$^0_{Sn^{2+}|Sn} = -0.14$$ V, E$$^0_{Pb^{2+}|Pb} = -0.13$$ V, $$\frac{2.303RT}{F} = 0.06$$)

Complexes (ML$$_5$$) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal geometries, respectively. The sum of the 90$$^\circ$$, 120$$^\circ$$ and 180$$^\circ$$ L-M-L angles in the two complexes is