NTA JEE Main 9th January 2019 Shift 1

For emission line of atomic hydrogen from $$n_i = 8$$ to $$n_f = n$$, the plot of wave number $$\bar{\nu}$$ against $$\frac{1}{n^2}$$ will be: (The Rydberg constant, $$R_H$$ is in wave number unit)

In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to:

According to molecular orbital theory, which of the following is true with respect to $$Li_2^+$$ and $$Li_2^-$$?

0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10 m$$^3$$ at 1000 K. Given, R is the gas constant in JK$$^{-1}$$mol$$^{-1}$$, x is:

Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures $$T_1$$ and $$T_2$$ ($$T_1 < T_2$$). The correct graphical depiction of the dependence of work done $$w$$ vs the final volume $$V$$ is:

20 ml of 0.1 M $$H_2SO_4$$ solution is added to 30 mL of 0.2 M $$NH_4OH$$ solution. The pH of the resultant mixture is: ($$pK_b$$ of $$NH_4OH = 4.7$$)

The isotopes of hydrogen are:

The alkaline earth metal nitrate that does not crystallise with molecules is:

Correct statements among regarding silicones are:
(a) They are polymers with hydrophobic character.
(b) They are biocompatible.
(c) In general, they have high thermal stability and low dielectric strength.
(d) Usually, they are resistant to oxidation and used as greases.