NTA JEE Main 2nd April 2017 Offline

1 gram of a carbonate M$$_{2}$$CO$$_{3}$$ on treatment with excess HCl produces 0.01186 moles of CO$$_{2}$$. The molar mass of M$$_{2}$$CO$$_{3}$$ in g mol$$^{-1}$$ is:

The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all $$^{1}$$H atoms are replaced by $$^{2}$$H atoms is:

Among the following species which option contains all isoelectronic species?

The radius of the second Bohr orbit for hydrogen atom is
(Planck's constant, (h) = $$6.6262 \times 10^{-34}$$ Js; mass of electron = $$9.1091 \times 10^{-31}$$ kg; charge of electron = $$1.60210 \times 10^{-19}$$ C; permittivity of vacuum, ($$\epsilon_{0}$$) = $$8.854185 \times 10^{-12}$$ kg$$^{-1}$$ m$$^{-3}$$ A$$^{2}$$)

Which of the following species is not paramagnetic?

Given:
C(graphite) + O$$_{2}$$(g) → CO$$_{2}$$(g); $$\Delta_{r}$$H° = -393.5 kJ mol$$^{-1}$$
H$$_{2}$$(g) + $$\frac{1}{2}$$O$$_{2}$$(g) → H$$_{2}$$O(l); $$\Delta_{r}$$H° = -285.8 kJ mol$$^{-1}$$
CO$$_{2}$$(g) + 2H$$_{2}$$O(l) → CH$$_{4}$$(g) + 2O$$_{2}$$(g); $$\Delta_{r}$$H° = +890.3 kJ mol$$^{-1}$$
Based on the above thermochemical equations, the value of $$\Delta_{r}$$H° at 298 K for the reaction
C(graphite) + 2H$$_{2}$$(g) → CH$$_{4}$$(g) will be:

$$\Delta U$$ is equal to:

pK$$_{a}$$ of a weak acid HA and pK$$_{b}$$ of a weak base BOH are 3.2 and 3.4 respectively. The pH of their salt AB solution at 25°C is:

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is:

Which of the following molecules is least resonance stabilized?