JEE (Advanced) 2012 Paper-1

Instructions

For the following questions answer them individually

Question 31

Identify the binary mixture(s) that can be separatedinto individual compounds, by differential extraction, as shown in the given scheme.

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Question 32

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

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Question 33

Which of the following molecules, in pure form, is (are) unstable at room temperature ?

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Question 34

Which of the following hydrogen halides react(s) with $$AgNO_3(aq)$$ to give a precipitate that dissolves in $$Na_2S_2O_3(aq)$$?

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Question 35

For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choice(s) is (are) correct ? [take $$\triangle S$$ as change in entropy and w as work done]

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Question 36

The substituents $$R_1$$ and $$R_2$$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?

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Question 37

The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in the periodic table ?

$$_{29}^{63}Cu + _{1}^{1}H \rightarrow 6_{0}^{1}n + \alpha + 2 _{1}^{1}H + X$$

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Question 38

When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is

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Question 39

29.2% (w/w) HCI stock solution has a density of 1.25 g m$$L^{-1}$$. The molecular weight of HCl is 36.5 g $$mol^{-1}$$. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

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Question 40

An organic compound undergoes first-order decomposition. The time taken for its decomposition to $$\frac{1}{8}$$ and $$\frac{1}{10}$$ of its initial concentration are $$t_{\frac{1}{8}}$$ and $$t_{\frac{1}{10}}$$ respectively. What is the value of $$\frac{[t_{\frac{1}{8}}]}{[t_{\frac{1}{10}}]} \times 10$$? (take $$\log_{10} 2 = 0.3$$)

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