The first ionization enthalpies of $$Be$$, $$B$$, $$N$$ and $$O$$ follow the order
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The first ionization enthalpies of $$Be$$, $$B$$, $$N$$ and $$O$$ follow the order
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Match List I with List II
Choose the correct answer from the options given below
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$$K_{a1}$$, $$K_{a2}$$ and $$K_{a3}$$ are the respective ionization constants for the following reactions (a), (b) and (c).
(a) $$H_2C_2O_4 \rightleftharpoons H^+ + HC_2O_4^-$$
(b) $$HC_2O_4^- \rightleftharpoons H^+ + C_2O_4^{2-}$$
(c) $$H_2C_2O_4 \rightleftharpoons 2H^+ + C_2O_4^{2-}$$
The relationship between $$K_{a1}$$, $$K_{a2}$$ and $$K_{a3}$$ is given as
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In base vs. Acid titration, at the end point methyl orange is present as
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High purity ($$> 99.95\%$$) dihydrogen is obtained by
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The correct order of density is
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Arrange the following in decreasing acidic strength.
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Major product of the following reaction is
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Match List I with List II.
Choose the correct answer from the options given below
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Two solutions A and B are prepared by dissolving $$1 \text{ g}$$ of non-volatile solutes X and Y respectively in $$1 \text{ kg}$$ of water. The ratio of depression in freezing points for A and B is found to be $$1:4$$. The ratio of molar masses of X and Y is
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The molar conductivity of a conductivity cell filled with $$10$$ moles of $$20 \text{ mL NaCl}$$ solution is $$\Lambda_{m1}$$ and that of $$20$$ moles of another identical cell having $$80 \text{ mL NaCl}$$ solution is $$\Lambda_{m2}$$. The conductivities exhibited by these two cells are same. The relationship between $$\Lambda_{m2}$$ and $$\Lambda_{m1}$$ is
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For micelle formation, which of the following statements are correct?
(A) Micelle formation is an exothermic process.
(B) Micelle formation is an endothermic process.
(C) The entropy change is positive.
(D) The entropy change is negative.
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Given below are two statements.
Statement I: Pig iron is obtained by heating cast iron with scrap iron.
Statement II: Pig iron has a relatively lower carbon content than that of cast iron.
In the light of the above statements, choose the correct answer from the options given below.
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The total number of acidic oxides from the following list is:
$$NO$$, $$N_2O$$, $$B_2O_3$$, $$N_2O_5$$, $$CO$$, $$SO_3$$, $$P_4O_{10}$$
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The correct order of energy of absorption for the following metal complexes is
$$A: [Ni(en)_3]^{2+}$$, $$B: [Ni(NH_3)_6]^{2+}$$, $$C: [Ni(H_2O)_6]^{2+}$$
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What is the major product of the following reaction?
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The correct structure of C is
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Match List-I with List-II
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Some drugs bind to a site other than the active site of an enzyme. This site is known as
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Glycosidic linkage between $$C_1$$ of $$\alpha$$-glucose and $$C_2$$ of $$\beta$$-fructose is found in
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$$56.0 \text{ L}$$ of nitrogen gas is mixed with excess of hydrogen gas and it is found that $$20 \text{ L}$$ of ammonia gas is produced. The volume of unused nitrogen gas is found to be ______ L.
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When the excited electron of a H atom from $$n = 5$$ drops to the ground state, the maximum number of emission lines observed are ______.
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The sum of number of lone pairs of electrons present on the central atoms of $$XeO_3$$, $$XeOF_4$$ and $$XeF_6$$ is ______.
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A sealed flask with a capacity of $$2 \text{ dm}^3$$ contains $$11 \text{ g}$$ of propane gas. The flask is so weak that it will burst if the pressure becomes $$2 \text{ MPa}$$. The minimum temperature at which the flask will burst is ______ °C. [Nearest integer]
(Given: $$R = 8.3 \text{ J K}^{-1} \text{ mol}^{-1}$$. Atomic masses of C and H are $$12u$$ and $$1u$$ respectively.) (Assume that propane behaves as an ideal gas.)
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While performing a thermodynamics experiment, a student made the following observations:
$$HCl + NaOH \rightarrow NaCl + H_2O \quad \Delta H = -57.3 \text{ kJ mol}^{-1}$$
$$CH_3COOH + NaOH \rightarrow CH_3COONa + H_2O \quad \Delta H = -55.3 \text{ kJ mol}^{-1}$$
The enthalpy of ionization of $$CH_3COOH$$ as calculated by the student is ______ $$\text{kJ mol}^{-1}$$.
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The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are $$3.25 \text{ cm}$$, $$2.08 \text{ cm}$$ and $$1.05 \text{ cm}$$ respectively. The ratio of $$R_f$$ values of A to B is ______ (Answer the nearest integer).
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The total number of monobromo derivatives formed by the alkanes with molecular formula $$C_5H_{12}$$ is ______ (excluding stereo isomers).
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For the decomposition of azomethane $$CH_3N_2CH_3(g) \rightarrow CH_3CH_3(g) + N_2$$, a first order reaction, the variation in partial pressure with time at $$600 \text{ K}$$ is given as shown.
The half life of the reaction is ______ $$\times 10^{-5}$$ s.
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The spin-only magnetic moment value of $$M^{3+}$$ ion (in gaseous state) from the pairs $$Cr^{3+}/Cr^{2+}$$, $$Mn^{3+}/Mn^{2+}$$, $$Fe^{3+}/Fe^{2+}$$ and $$Co^{3+}/Co^{2+}$$ that has negative standard electrode potential, is ______ B.M.
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A sample of $$4.5 \text{ mg}$$ of an unknown monohydric alcohol, $$R-OH$$ was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be $$3.1 \text{ mL}$$. The molecular weight of the unknown alcohol is ______ g/mol.
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