NTA JEE Mains 1st Feb 2024 Shift 1

Consider the following reaction: $$3PbCl_2 + 2(NH_4)_3PO_4 \rightarrow Pb_3(PO_4)_2 + 6NH_4Cl$$. If $$72$$ mmol $$PbCl_2$$ is mixed with $$50$$ mmol of $$(NH_4)_3PO_4$$, then amount of $$Pb_3(PO_4)_2$$ formed in mmol is (nearest integer):

Lowest oxidation number of an atom in a compound $$A_2B$$ is $$-2$$. The number of electrons in its valence shell is:

The number of molecules/ion/s having trigonal bipyramidal shape is: $$PF_5$$, $$BrF_5$$, $$PCl_5$$, $$[PtCl_4]^{2-}$$, $$BF_3$$, $$Fe(CO)_5$$

$$K_a$$ for $$CH_3COOH$$ is $$1.8 \times 10^{-5}$$ and $$K_b$$ for $$NH_4OH$$ is $$1.8 \times 10^{-5}$$. The pH of ammonium acetate solution will be:

Number of optical isomers possible for 2-chlorobutane is:

Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is: 

The potential for the given half cell at 298K is $$- x \times 10^{-2}$$ V.
$$2H^+_{(aq)} + 2e^- \rightarrow H_2(g)$$, $$[H^+] = 1$$ M, $$P_{H_2} = 2$$ atm.
(Given $$2.303\ RT/F = 0.06$$ V, $$\log 2 = 0.3$$). The value of $$x$$ is:

The ratio of $$\frac{^{14}C}{^{12}C}$$ in a piece of wood is $$\frac{1}{8}$$ part that of atmosphere. If half life of $$^{14}C$$ is $$5730$$ years, the age of wood sample is _____ years.

Among the following oxides of p-block elements: $$Cl_2O_7$$, $$CO$$, $$PbO_2$$, $$N_2O$$, $$NO$$, $$Al_2O_3$$, $$SiO_2$$, $$N_2O_5$$, $$SnO_2$$, the number of amphoteric oxides is:

The number of white coloured salts among the following is: (A) $$SrSO_4$$ (B) $$MgNH_4PO_4$$ (C) $$BaCrO_4$$ (D) $$Mn(OH)_2$$ (E) $$PbSO_4$$ (F) $$PbCrO_4$$ (G) $$AgBr$$ (H) $$PbI_2$$ (I) $$CaC_2O_4$$ (J) $$Fe(OH)_2(CH_3COO)$$