NTA JEE Mains 30th Jan 2024 Shift 2

Number of spectral lines obtained in $$He^+$$ spectra, when an electron makes transition from fifth excited state to first excited state will be

Two reactions are given below:
$$2Fe_{(s)} + \frac{3}{2}O_{2(g)} \rightarrow Fe_2O_{3(s)}$$, $$\Delta H° = -822$$ kJ/mol
$$C_{(s)} + \frac{1}{2}O_{2(g)} \rightarrow CO_{(g)}$$, $$\Delta H° = -110$$ kJ/mol
Then enthalpy change for following reaction:
$$3C_{(s)} + Fe_2O_{3(s)} \rightarrow 2Fe_{(s)} + 3CO_{(g)}$$

The pH of an aqueous solution containing 1M benzoic acid ($$pK_a = 4.20$$) and 1M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is _________ mL.

Total number of species from the following which can undergo disproportionation reaction: $$H_2O_2$$, $$ClO_3^-$$, $$P_4$$, $$Cl_2$$, $$Ag$$, $$Cu^{+1}$$, $$F_2$$, $$NO_2$$, $$K^+$$

Number of geometrical isomers possible for the given structure is/are ________.

$$NO_2$$ required for a reaction is produced by decomposition of $$N_2O_5$$ in $$CCl_4$$ as by equation:
$$2N_2O_{5(g)} \rightarrow 4NO_{2(g)} + O_{2(g)}$$
The initial concentration of $$N_2O_5$$ is 3 mol L$$^{-1}$$ and it is 2.75 mol L$$^{-1}$$ after 30 minutes. The rate of formation of $$NO_2$$ is $$x \times 10^{-3}$$ mol L$$^{-1}$$ min$$^{-1}$$, value of $$x$$ is ________.

Number of complexes which show optical isomerism among the following is _________.
$$cis-[Cr(ox)_2Cl_2]^{3-}$$, $$[Co(en)_3]^{3+}$$, $$cis-[Pt(en)_2Cl_2]^{2+}$$, $$cis-[Co(en)_2Cl_2]^+$$, $$trans-[Pt(en)_2Cl_2]^{2+}$$, $$trans-[Cr(ox)_2Cl_2]^{3-}$$

2-chlorobutane + $$Cl_2 \rightarrow C_4H_8Cl_2$$ (isomers)
Total number of optically active isomers shown by $$C_4H_8Cl_2$$, obtained in the above reaction is ________.

Number of metal ions characterized by flame test among the following is _________.
$$Sr^{2+}$$, $$Ba^{2+}$$, $$Ca^{2+}$$, $$Cu^{2+}$$, $$Zn^{2+}$$, $$Co^{2+}$$, $$Fe^{2+}$$

The total number of correct statements, regarding the nucleic acids is _________.
A. RNA is regarded as the reserve of genetic information.
B. DNA molecule self-duplicates during cell division.
C. DNA synthesizes proteins in the cell.
D. The message for the synthesis of particular proteins is present in DNA.
E. Identical DNA strands are transferred to daughter cells.