A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:
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A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:
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If $$\lambda_0$$ and $$\lambda$$ be threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is:
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Based on the equation: $$\Delta E = -2.0 \times 10^{-18}$$ J $$\left(\frac{1}{n_2^2} - \frac{1}{n_1^2}\right)$$, the wavelength of the light that must be absorbed to excite hydrogen electron from level n = 1 to level n = 2 will be: (h = $$6.625 \times 10^{-34}$$ Js, C = $$3 \times 10^8$$ ms$$^{-1}$$)
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Which of the following series correctly represents relations between the elements from X to Y? X → Y
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The correct order of bond dissociation energy among N$$_2$$, O$$_2$$, O$$_2^-$$ is shown in which of the following arrangements?
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Which one of the following does not have a pyramidal shape?
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In allene (C$$_3$$H$$_4$$), the type(s) of hybridization of the carbon atoms is (are):
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The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mmHg to 360.0 mmHg, the final volume the gas will be:
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The molar heat capacity (C$$_p$$) of CD$$_2$$O is 10 cals at 1000 K. The change of entropy associated with cooling of 32 g of CD$$_2$$O vapour from 1000 K to 100 K at constant pressure will be: (D = deuterium, atomic mass = 2u)
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Consider the following equilibrium:
$$AgCl \downarrow + 2NH_3 \rightleftharpoons [Ag(NH_3)_2]^+ + Cl^-$$
White precipitate of AgCl appears on adding which of the following?
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Assuming that the degree of hydrolysis is small, the pH of 0.1M solution of sodium acetate (K$$_a$$ = $$1.0 \times 10^{-5}$$) will be:
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Which of the following statements about Na$$_2$$O$$_2$$ is not correct?
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The reagent needed for converting:
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The gas liberated by the electrolysis of Dipotassium succinate solution is:
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Which of the following statements about the depletion of ozone layer is correct?
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The appearance of colour in solid alkali metal halides is generally due to:
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In some solutions, the concentration of H$$_3$$O$$^+$$ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:
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Given:
Fe$$^{3+}$$(aq) + e$$^-$$ → Fe$$^{2+}$$(aq); E$$^0$$ = +0.77 V
Al$$^{3+}$$(aq) + 3e$$^-$$ → Al(s); E$$^0$$ = $$-1.66$$ V
Br$$_2$$(aq) + 2e$$^-$$ → 2Br$$^-$$; E$$^0$$ = +1.09 V
Considering the electrode potentials, which of the following represents the correct order of reducing power?
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In the reaction of formation of sulphur trioxide by contact process $$2SO_2 + O_2 \rightleftharpoons 2SO_3$$ the rate of reaction was measured as $$\frac{d[O_2]}{dt} = -2.5 \times 10^{-4}$$ mol L$$^{-1}$$ s$$^{-1}$$. The rate of reaction in terms of [SO$$_2$$] in mol L$$^{-1}$$ s$$^{-1}$$ will be:
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For the reaction, $$2N_2O_5 \to 4NO_2 + O_2$$, the rate equation can be expressed in two ways:
$$-\frac{d[N_2O_5]}{dt} = k[N_2O_5]$$ and $$+\frac{d[NO_2]}{dt} = k'[N_2O_5]$$. k and k' are related as:
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Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated?
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Which of the following name formula combinations is not correct?
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Consider the coordination compound, [Co(NH$$_3$$)$$_6$$]Cl$$_3$$. In the formation of this complex, the species which acts as the Lewis acid is:
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Chlorobenzene reacts with trichloro acetaldehyde in the presence of H$$_2$$SO$$_4$$. The major product formed is:
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Tischenko reaction is a modification of:
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Which one of the following statements is not correct?
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The following reaction is known as:
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An organic compound A, C$$_5$$H$$_8$$O; reacts with H$$_2$$O, NH$$_3$$ and CH$$_3$$COOH as described below:
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Complete reduction of benzene-diazonium chloride with Zn/HCl gives:
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Which one of the following is used as Antihistamine?
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