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A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration was removed. The dried sample weighed 52 g. The formula of the hydrated salt is: (atomic mass, Ba = 137 amu, Cl = 35.5 amu)
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If the principal quantum number n = 6, the correct sequence of filling of electrons will be:
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In the long form of the periodic table, the valence shell electronic configuration of $$5s^25p^4$$ corresponds to the element present in:
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The shape of $$XeOF_4$$ by VSEPR theory is:
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After understanding the assertion and reason, choose the correct option.
Assertion: In the bonding molecular orbital (MO) of $$H_2$$, electron density is increased between the nuclei.
Reason: The bonding MO is $$\psi_A + \psi_B$$, which shows destructive interference of the combining electron waves.
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Which of the following is not an assumption of the kinetic theory of gases?
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The heat of atomization of methane and ethane are 360 kJ mol$$^{-1}$$ and 620 kJ mol$$^{-1}$$, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro's number = $$6.023 \times 10^{23}$$, h = $$6.62 \times 10^{-34}$$ J s)
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Gaseous $$N_2O_4$$ dissociates into gaseous $$NO_2$$ according to the reaction $$N_2O_4(g) \rightleftharpoons 2NO_2(g)$$. At 300 K and 1 atm pressure, the degree of dissociation of $$N_2O_4$$ is 0.2. If one mole of $$N_2O_4$$ gas is contained in a vessel, then the density of the equilibrium mixture is:
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Permanent hardness in water cannot be cured by:
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The correct order of thermal stability of hydroxides is
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1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10 $$H_2SO_4$$ solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is:
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The optically inactive compound from the following is:
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A compound A with molecular formula $$C_{10}H_{13}Cl$$, gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis, gives C and D. C gives Cannizaro reaction, but not aldol condensation. D gives aldol condensation, but not Cannizaro reaction. A is
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Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN). X is:
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A solution at 20$$^\circ$$C is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:
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A variable, the opposite external potential $$(E_{ext})$$ is applied to the cell Zn | Zn$$^{2+}$$ (1M) || Cu$$^{2+}$$ (1M) | Cu, of potential 1.1 V. When $$E_{ext} < 1.1$$ V and $$E_{ext} > 1.1$$ V, respectively electrons flow from
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The reaction $$2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$$ follows first order kinetics. The pressure of a vessel containing only $$N_2O_5$$ was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant):
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The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:
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In the isolation of metals, calcination process usually results in:
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The least number of oxyacids are formed by:
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The cation that will not be precipitated by $$H_2S$$ in the presence of dil HCl is:
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An aqueous solution of a salt X turns blood red on treatment with $$SCN^-$$ and blue on treatment with $$K_4[Fe(CN)_6]$$, X also gives a positive chromyl chloride test. The salt X is:
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Which molecule/ion among the following cannot act as a ligand in complex compounds?
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The correct statement on the isomerism associated with the following complex ions.
(a) $$[Ni(H_2O)_5NH_3]^{2+}$$
(b) $$[Ni(H_2O)_4(NH_3)_2]^{2+}$$ and
(c) $$[Ni(H_2O)_3(NH_3)_3]^{2+}$$ is:
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A is:
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In the presence of a small amount of phosphorous, aliphatic carboxylic acid reacts with chlorine or bromine to yield a reaction in which, $$\alpha$$-hydrogen is been replaced by halogen. This reaction is known as
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The correct order of basicity is
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Match the polymers in column-A with their main uses in column-B and choose the correct answer:
Column - A Column - B
A. Polystyrene i. Paints and lacquers
B. Glyptal ii. Rain coats
C. Polyvinyl chloride iii. Manufacture of toys
D. Bakelite iv. Computer discs
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is used as:
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Complete hydrolysis of starch gives:
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