JEE (Advanced) 2012 Paper-1

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

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

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

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

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]

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 ?

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 ?

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

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

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

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 $$\log_{10} 2 = 0.3$$)