The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be
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The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be
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How many litres of water must be added to 1 litre of aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
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Experimentally it was found that a metal oxide has formula $$M_{0.98}O$$. Metal M, is present as $$M^{2+}$$ and $$M^{3+}$$ in its oxide. Fraction of the metal which exists as $$M^{3+}$$ would be:
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A gaseous hydrocarbon on combustion gives 0.72 g of water and 3.08 g $$CO_2$$. What is the empirical formula of the hydrocarbon?
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Energy of an electron is given by $$E = -2.178 \times 10^{-18}\left(\frac{Z^2}{n^2}\right)$$ J. Wavelength of light required to excite an electron in a hydrogen atom from level n=1 to n=2 will be :
$$(h = 6.62 \times 10^{-34}$$ Js and $$c = 3.0 \times 10^8$$ ms$$^{-1})$$
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The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na$$^+$$ will be :
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Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
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Stability of the species $$Li_2$$, $$Li_2^-$$ and $$Li_2^+$$ increases in the order of
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Which one of the following molecules is expected to exhibit paramagnetic behaviour?
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In which of the following pairs of molecules/ions, both the species are not likely to exist?
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For gaseous state, if most probable speed is denoted by $$C^*$$, average speed by $$\bar{C}$$ and root mean square speed by C, then for many molecules, what is the ratios of these speeds?
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A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. The values of q and w for the process will be
(R = 8.314 J/mol K) (ln7.5 = 2.01)
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Consider the following reaction:
$$x \ MnO_4^- + y \ C_2O_4^{2-} + zH^+ \rightarrow x \ Mn^{2+} + 2y \ CO_2 + \frac{z}{2} H_2O$$
The values of x, y and z in the reaction are, respectively:
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A solution of (-)1-chloro-1-phenylethane in toluene racemises slowly in the presence of a small amount of $$SbCl_5$$, due to the formation of :
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Arrange the following compounds in order of decreasing acidity :
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The order of stability of the following carbocations:
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The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was :
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Which of the following exists as covalent crystals in the solid state?
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Four successive members of the first row of transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $$E^\circ_{M^{3+}/M^{2+}}$$ value?
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The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be:
$$(R = 8.314$$ JK$$^{-1}$$ mol$$^{-1}$$ and log 2 = 0.301$$)$$
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The coagulating power of electrolytes having ions Na$$^+$$, Al$$^{3+}$$ and Ba$$^{2+}$$ for arsenic sulphide sol increases in the order,
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Which of the following is wrong statement?
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Which of the following arrangements does not represent the correct order of the property stated against it?
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Given:
$$E^\circ_{Cr^{3+}/Cr} = -0.74$$ V; $$E^\circ_{MnO_4^-/Mn^{2+}} = 1.51$$ V
$$E^\circ_{Cr_2O_7^{2-}/Cr^{3+}} = 1.33$$ V; $$E^\circ_{Cl_2/Cl^-} = 1.36$$ V
Based on the data given above, strongest oxidising agent will be:
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Which of the following complex species is not expected to exhibit optical isomerism?
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An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism:
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Compound (A), $$C_8H_9Cl$$, gives a white precipitate when warmed with alcoholic AgNO$$_3$$. Oxidation of (A) gives an acid (B), $$C_8H_6O_4$$. (B) easily forms anhydride on heating. Identify the compound (A).
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An organic compound A upon reacting with $$NH_3$$ gives B. On heating, B gives C. C in presence of KOH reacts with $$Br_2$$ to give $$CH_3CH_2NH_2$$. A is :
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A compound with molecular mass 180 is acylated with $$CH_3COCl$$ to get a compound with molecular mass 390. The number of amino groups presents per molecule of the former compound is
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Synthesis of each molecule of glucose in photosynthesis involves
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