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NTA JEE Main 16 th April 2018 Online - Chemistry

For the following questions answer them individually

An unknown chlorohydrocarbon has 3.55% of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are: (Atomic wt. of Cl = 35.5 u; Avogadro constant = 6.023 $$\times$$ 10$$^{23}$$ mol$$^{-1}$$)

Which of the following statements is false?

At 320 K, a gas A$$_2$$ is 20% dissociated to A(g). The standard Gibbs free energy change at 320 K and 1 atm in J mol$$^{-1}$$ is approximately: (R = 8.314 J K$$^{-1}$$ mol$$^{-1}$$; ln 2 = 0.693; ln 3 = 1.098)

For which of the following processes, $$\Delta S$$ is negative?

The gas phase reaction 2NO$$_2$$(g) $$\rightarrow$$ N$$_2$$O$$_4$$(g) is an exothermic reaction. The decomposition of N$$_2$$O$$_4$$, in equilibrium mixture of NO$$_2$$(g) and N$$_2$$O$$_4$$(g) can be increased by:

A group 13 element 'X' reacts with chlorine gas to produce a compound XCl$$_3$$. XCl$$_3$$ is electron deficient and easily reacts with NH$$_3$$ to form Cl$$_3$$X $$\leftarrow$$ NH$$_3$$ adduct; however, XCl$$_3$$ does not dimerize. X is:

Among the oxides of nitrogen: N$$_2$$O$$_3$$, N$$_2$$O$$_4$$ and N$$_2$$O$$_5$$; the molecule(s) having nitrogen-nitrogen bond is/are:

When XO$$_2$$ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO$$_3$$; a dark green product is formed which disproportionate in acidic solution to afford a dark purple solution. X is:

The incorrect statement is:

In a complexometric titration of metal ion with ligand M (Metal ion) + L(Ligand) $$\rightarrow$$ C (Complex). End point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs then the titration plot between absorbed light (A) versus volume of ligand 'L' (V) would look like:

Among the following, the incorrect statement is: