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$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$
Consider the reaction: . If 20 g of dinitrogen reacts with 5 g of dihydrogen, then the limiting reagent of the reaction and number of moles of $$NH_3$$ formed respectively are
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The first ionization enthalpy of Na and Mg, respectively, are: 496 & 737 kJ mol$$^{-1}$$. The first ionization enthalpy (kJ mol$$^{-1}$$) of Al is
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Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?
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Number of lone pairs of electrons in the central atom of $$SCl_2$$, $$O_3$$, $$ClF_3$$ and $$SF_6$$, respectively, are
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The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives
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Lithium nitrate and sodium nitrate, when heated separately, respectively, give
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Which among the following pairs of structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)
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Which among the following pairs has only herbicides?
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100 mL of 5% (w/v) solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred well. This resulted in a/an
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In metallurgy the term "gangue" is used for
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In following pairs, the one in which both transition metal ions are colourless is
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In neutral or faintly alkaline medium, $$KMnO_4$$ being a powerful oxidant can oxidise, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be
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Considering the above reactions, the compound 'A' and compound 'B' respectively are
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Consider the above reaction sequence, the Product 'C' is
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A compound 'X' is acidic and it is soluble in NaOH solution, but insoluble in $$NaHCO_3$$ solution. Compound 'X' also gives violet colour with neutral $$FeCl_3$$ solution. The compound 'X' is
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Consider the following reaction sequence. The product 'B' is
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Which among the following is the strongest Bronsted base?
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Consider the above reaction, the compound 'A' is
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Which among the following represent reagent 'A'?
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Which of the following compounds is an example of hypnotic drug?
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The minimum uncertainty in the speed of an electron in one dimensional region of length $$2a_0$$ (Where $$a_0$$ = Bohr radius = 52.9 pm) is _____ km s$$^{-1}$$ (Nearest integer) (Given: Mass of electron $$= 9.1 \times 10^{-31}$$ kg, Planck's constant $$h = 6.63 \times 10^{-34}$$ Js)
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When 600 mL of 0.2 M $$HNO_3$$ is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is _____ $$\times 10^{-2}$$ °C (Enthalpy of neutralisation = 57 kJ mol$$^{-1}$$ and Specific heat of water = 4.2 J K$$^{-1}$$ g$$^{-1}$$) (Neglect heat capacity of flask)
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If the solubility product of PbS is $$8 \times 10^{-28}$$, then the solubility of PbS in pure water at 298 K is $$x \times 10^{-16}$$ mol L$$^{-1}$$. The value of x is _____ (Nearest integer) [Given $$\sqrt{2} = 1.41$$]
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In bromination of Propyne, with Bromine 1,1,2,2-tetrabromopropane is obtained in 27% yield. The amount of 1,1,2,2-tetrabromopropane obtained from 1 g of Bromine in this reaction is _____ $$\times 10^{-1}$$ g. (Molar Mass: Bromine = 80 g/mol)
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Ionic radii of cation $$A^+$$ and anion $$B^-$$ are 102 and 181 pm respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for $$B^-$$. $$A^+$$ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is _____ pm.
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If $$O_2$$ gas is bubbled through water at 303 K, the number of millimoles of $$O_2$$ gas that dissolve in 1 litre of water is _____ (Nearest integer) (Given: Henry's Law constant for $$O_2$$ at 303 K is 46.82k bar and partial pressure of $$O_2$$ = 0.920 bar) (Assume solubility of $$O_2$$ in water is too small, nearly negligible)
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Resistance of a conductivity cell (cell constant 129 m$$^{-1}$$) filled with 74.5 ppm solution of KCl is 100 $$\Omega$$ (labelled as solution 1). When the same cell is filled with KCl 149 ppm solution of KCl, the resistance is 50 $$\Omega$$ (labelled as solution 2). The ratio of molar conductivity of solution 1 and solution 2 is i.e. $$\frac{\Lambda_1}{\Lambda_2} = x \times 10^{-3}$$. The value of x is _____ (Given, molar mass of KCl is 74.5 g mol$$^{-1}$$)
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The reaction between X and Y is first order with respect to X and zero order with respect to Y.
| Experiment | [X] mol L$$^{-1}$$ | [Y] mol L$$^{-1}$$ | Initial rate mol L$$^{-1}$$ min$$^{-1}$$ |
|---|---|---|---|
| I | 0.1 | 0.1 | $$2 \times 10^{-3}$$ |
| II | L | 0.2 | $$4 \times 10^{-3}$$ |
| III | 0.4 | 0.4 | $$M \times 10^{-3}$$ |
| IV | 0.1 | 0.2 | $$2 \times 10^{-3}$$ |
Examine the data of table and calculate ratio of numerical values of M and L.
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$$[Fe(CN)_6]^{3-}$$ should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is $$(-) \Delta_0$$ _____ .
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In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is
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