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Excess of NaOH (aq) was added to 100 mL of FeCl$$_3$$ (aq) resulting into 2.14 g of Fe(OH)$$_3$$. The molarity of FeCl$$_3$$(aq) is: (Given the molar mass of Fe = 56 g mol$$^{-1}$$ and molar mass of Cl = 35.5 g mol$$^{-1}$$)
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If the shortest wavelength in Lyman series of hydrogen atom is $$A$$, then the longest wavelength in Paschen series of He$$^+$$ is:
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Which of the following is paramagnetic?
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$$sp^3d^2$$ hybridization is not displayed by
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Among the following, the incorrect statement is:
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The enthalpy change on freezing of 1 mol of water at 5°C to ice at $$-5$$°C is: (Given $$\Delta_{fus}H = 6$$ kJ mol$$^{-1}$$ at 0°C, $$C_p(H_2O, l) = 75.3$$ J mol$$^{-1}$$ K$$^{-1}$$, $$C_p(H_2O, s) = 36.8$$ J mol$$^{-1}$$ K$$^{-1}$$)
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For a reaction, $$A(g) \to A(l)$$; $$\Delta H = -3RT$$. The correct statement for the reaction is:
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Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is $$10^{-5}$$, the ratio of salt to acid concentration in the buffer solution will be:
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The pair of compounds having metals in their highest oxidation state is:
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In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?
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A metal M reacts with nitrogen gas to afford $$M_3N$$, $$M_3N$$ on heating at high temperature gives back M and on reaction with water produces a gas B. Gas B reacts with an aqueous solution of CuSO$$_4$$ to form a deep blue compound. M and B respectively are:
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Consider the following ionization enthalpies of two elements 'A' and 'B'.
| Element | 1st (kJ/mol) | 2nd (kJ/mol) | 3rd (kJ/mol) |
|---|---|---|---|
| A | 899 | 1757 | 14847 |
| B | 737 | 1450 | 7731 |
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Which of the following statements is not true about partition chromatography?
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The IUPAC name of the following compound is:
Which of the following compounds will not undergo Friedel Crafts reaction with benzene?
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Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
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5 g of Na$$_2$$SO$$_4$$ was dissolved in $$x$$ g of H$$_2$$O. The change in freezing point was found to be 3.82°C. If Na$$_2$$SO$$_4$$ is 81.5% ionised, the value of $$x$$ is approximately: ($$K_f$$ for water = 1.86°C kg mol$$^{-1}$$) (molar mass of S = 32 g mol$$^{-1}$$ and that of Na = 23 g mol$$^{-1}$$)
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Consider the following standard electrode potentials ($$E°$$ in volts) in aqueous solution:
| Element | $$M^{3+}/M$$ | $$M^+/M$$ |
|---|---|---|
| Al | $$-1.66$$ | $$+0.55$$ |
| Tl | $$+1.26$$ | $$-0.34$$ |
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What is the standard reduction potential ($$E°$$) for $$Fe^{3+} \to Fe$$?
Given that:
$$Fe^{2+} + 2e^- \to Fe$$; $$E°_{Fe^{2+}/Fe} = -0.47$$ V
$$Fe^{3+} + e^- \to Fe^{2+}$$; $$E°_{Fe^{3+}/Fe^{2+}} = +0.77$$ V
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The rate of a reaction A doubles on increasing the temperature from 300 to 310 K. By how much, the temperature of reaction B should be increased from 300 K so that rate doubles if activation energy of the reaction B is twice to that of reaction A.
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Among the following, the correct statement is:
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The number of S = O and S - OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are:
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A solution containing a period-IV cation gives a precipitate on passing H$$_2$$S. A solution of this precipitate in dil. HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:
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The major product of the following reaction is:
The major product of the following reaction is:
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The major product of the following reaction is:
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The major product expected from the following reaction is:
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A mixture containing the following four compounds is extracted with 1 M HCl. The compound that goes to aqueous layer is:
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The reason for "drug induced poisoning" is:
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Among the following, the essential amino acid is:
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