NTA JEE Main 22nd April 2013 Online - Chemistry

For the following questions answer them individually
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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 35

Bond order normally gives idea of stability of a molecular species. All the molecules viz. $$H_2$$, $$Li_2$$ and $$B_2$$ have the same bond order yet they are not equally stable. Their stability order is :

NTA JEE Main 22nd April 2013 Online - Chemistry - Question 36

Given Reaction Energy Change (in kJ):
Li(s) $$\rightarrow$$ Li(g) : 161
Li(g) $$\rightarrow$$ Li$$^+$$(g) : 520
$$\frac{1}{2}F_2(g) \rightarrow$$ F(g) : 77
F(g) + e$$^-$$ $$\rightarrow$$ F$$^-$$(g) : (Electron gain enthalpy)
Li$$^+$$(g) + F$$^-$$(g) $$\rightarrow$$ LiF(s) : -1047
Li(s) + $$\frac{1}{2}F_2$$(g) $$\rightarrow$$ LiF(s) : -617
Based on data provided, the value of electron gain enthalpy of fluorine would be :

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 37

The reaction X $$\rightarrow$$ Y is an exothermic reaction. Activation energy of the reaction for X into Y is 150 kJ mol$$^{-1}$$. Enthalpy of reaction is 135 kJ mol$$^{-1}$$. The activation energy for the reverse reaction, Y $$\rightarrow$$ X will be :

NTA JEE Main 22nd April 2013 Online - Chemistry - Question 38

Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts $$Hg_2Cl_2$$, $$Cr_2(SO_4)_3$$, $$BaSO_4$$ and $$CrCl_3$$ respectively?

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 40

Values of dissociation constant, $$K_a$$ are given as follows :
Acid             $$K_a$$
HCN             $$6.2 \times 10^{-10}$$
HF               $$7.2 \times 10^{-4}$$
HNO$$_2$$          $$4.0 \times 10^{-4}$$
Correct order of increasing base strength of $$CN^-$$, $$F^-$$ and $$NO_2^-$$ will be :

NTA JEE Main 22nd April 2013 Online - Chemistry - Question 42

Arrange in the correct order of stability (decreasing order) for the following molecules: (I), (II), (III), (IV) - cyclohexane conformations
I.

II.

III.

IV.

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 45

Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 46

Which one of the following statements about packing in solids is incorrect?

NTA JEE Main 22nd April 2013 Online - Chemistry - Question 47

A molecule M associates in a given solvent according to the equation $$M \rightleftharpoons (M)_n$$. For a certain concentration of M, the van't Hoff factor was found to be 0.9 and the fraction of associated molecules was 0.2. The value of n is:

NTA JEE Main 22nd April 2013 Online - Chemistry - Question 48

Flocculation value of $$BaCl_2$$ is much less than that of KCl for sol A and flocculation value of $$Na_2SO_4$$ is much less than that of NaBr for sol B. The correct statement among the following is :

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 50

Oxidation state of sulphur in anions $$SO_4^{2-}$$, $$S_2O_4^{2-}$$ and $$S_2O_6^{2-}$$ increases in the orders :

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 53

Which of the following statements is incorrect?

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NTA JEE Main 22nd April 2013 Online - Chemistry - Question 57

In Williamson synthesis of mixed ether having a primary and a tertiary alkyl group if tertiary halide is used, then :

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