NTA JEE Main 10th April 2015 Online

1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10 $$H_2SO_4$$ solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is:

The optically inactive compound from the following is:

A compound A with molecular formula $$C_{10}H_{13}Cl$$, gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis, gives C and D. C gives Cannizaro reaction, but not aldol condensation. D gives aldol condensation, but not Cannizaro reaction. A is

Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN). X is:

A solution at 20$$^\circ$$C is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:

A variable, the opposite external potential $$(E_{ext})$$ is applied to the cell Zn | Zn$$^{2+}$$ (1M) || Cu$$^{2+}$$ (1M) | Cu, of potential 1.1 V. When $$E_{ext} < 1.1$$ V and $$E_{ext} > 1.1$$ V, respectively electrons flow from

The reaction $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ follows first order kinetics. The pressure of a vessel containing only $$N_2O_5$$ was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant):

The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:

In the isolation of metals, calcination process usually results in:

The least number of oxyacids are formed by: