The amount of BaSO$$_4$$ formed upon mixing 100 mL of 20.8% BaCl$$_2$$ solution with 50 mL of 9.8% H$$_2$$SO$$_4$$ solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)
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The amount of BaSO$$_4$$ formed upon mixing 100 mL of 20.8% BaCl$$_2$$ solution with 50 mL of 9.8% H$$_2$$SO$$_4$$ solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)
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If $$m$$ and $$e$$ are the mass and charge of the revolving electron in the orbit of radius $$r$$ for hydrogen atom, the total energy of the revolving electron will be:
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The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 ms$$^{-1}$$ is:
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Excited hydrogen atom emits light in the ultraviolet region at $$2.47 \times 10^{15}$$ Hz. With this frequency, the energy of a single photon is: (h = $$6.63 \times 10^{-34}$$ Js)
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Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to:
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Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O$$^{2-}$$, S$$^{2-}$$, N$$^{3-}$$, P$$^{3-}$$?
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Which of the following molecules has two sigma ($$\sigma$$) and two pi ($$\pi$$) bonds?
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The (S°) of the following substances are: CH$$_4$$(g) 186.2 JK$$^{-1}$$ mol$$^{-1}$$, O$$_2$$(g) 205.2 JK$$^{-1}$$ mol$$^{-1}$$, CO$$_2$$(g) 213.6 JK$$^{-1}$$ mol$$^{-1}$$, H$$_2$$O(g) 69.9 JK$$^{-1}$$ mol$$^{-1}$$. The entropy change ($$\Delta S^\circ$$) for the reaction CH$$_4$$(g) + 2O$$_2$$(g) → CO$$_2$$(g) + 2H$$_2$$O(l) is:
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The standard enthalpy of formation ($$\Delta_fH^\circ_{298}$$) for methane, CH$$_4$$ is $$-74.9$$ kJ mol$$^{-1}$$. In order to calculate the average energy given out in the formation of a C-H bond from this it is necessary to know which one of the following?
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What happens when an inert gas is added to an equilibrium keeping volume unchanged?
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The conjugate base of hydrazoic acid is:
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Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H$$_2$$O$$_2$$ acts as a reducing agent in acid medium?
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Which one of the following acids does not exhibit optical isomerism?
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on mercuration-demercuration produces the major product:
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In the presence of peroxide, HCl and HI do not give anti-Markownikoff's addition of alkenes because:
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Global warming is due to increase of:
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In a monoclinic unit cell, the relation of sides and angles are respectively:
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How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper = 63.5u, N$$_A$$ = Avogadro's constant):
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The rate coefficient (k) for a particular reactions is $$1.3 \times 10^{-4}$$ M$$^{-1}$$ s$$^{-1}$$ at 100°C, and $$1.3 \times 10^{-3}$$ M$$^{-1}$$ s$$^{-1}$$ at 150°C. What is the energy of activation (E$$_A$$) (in kJ) for this reaction? (R = molar gas constant = 8.314 JK$$^{-1}$$ mol$$^{-1}$$)
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Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?
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Which one of the following exhibits the large number of oxidation states?
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Copper becomes green when exposed to moist air for a long period. This is due to:
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Among the following species the one which causes the highest CFSE, $$\Delta_0$$ as a ligand is:
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Which one of the following complexes will most likely absorb visible light? (At. nos. Sc = 21, Ti = 22, V = 23, Zn = 30)
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Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?
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The major product obtained in the photo catalysed bromination of 2-methylbutane is:
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In the Victor-Meyer's test, the colour given by 1°, 2° and 3° alcohols are respectively:
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Phthalic acid reacts with resorcinol in the presence of concentrated H$$_2$$SO$$_4$$ to give:
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Aminoglycosides are usually used as:
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Which of the following will not show mutarotation?
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