Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is
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Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is
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Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
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Which of the following structures are aromatic in nature?
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The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is
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Which amongst the following is not a pesticide?
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The incorrect statement about the imperfections in solids is
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The Zeta potential is related to which property of colloids?
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Given are two statements one is labelled as Assertion and other is labelled as Reason.
Assertion: Magnesium can reduce $$Al_2O_3$$ at a temperature below $$1350°$$C, while above $$1350°$$C aluminium can reduce MgO.
Reason: The melting and boiling points of magnesium are lower than those of aluminium.
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Nitrogen gas is obtained by thermal decomposition of:
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Given below are two statements :
Statement I: The pentavalent oxide of group-15 element, $$E_2O_5$$, is less acidic than trivalent oxide, $$E_2O_3$$, of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $$E_2O_3$$, decreases down the group.
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Dihydrogen reacts with CuO to give
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Which one of the lanthanoids given below is the most stable in divalent form?
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Given below are two statements :
Statement I: $$[Ni(CN)_4]^{2-}$$ is square planar and diamagnetic complex, with $$dsp^2$$ hybridization for Ni but $$[Ni(CO)_4]$$ is tetrahedral, paramagnetic and with $$sp^3$$ hybridication for Ni.
Statement II : $$[NiCl_4]^{2-}$$ and $$[Ni(CO)_4]$$ both have same d-electron configuration, have same geometry and are paramagnetic.
In light the above statements, choose the correct answer form the options given below
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The major product (P) in the reaction
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Which one of the following compounds is inactive towards $$S_N1$$ reaction?
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The correct structure of product 'A' formed in the following reaction,
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Identify the major product formed in the following sequence of reactions :
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A primary aliphatic amine on reaction with nitrous acid in cold (273 K) and there after raising temperature of reaction mixture to room temperature (298 K), gives a/an
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Which one of the following is NOT a copolymer?
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Stability of $$\alpha$$-Helix structure of proteins depends upon
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If the work function of a metal is $$6.63 \times 10^{-19}$$ J, the maximum wavelength of the photon required to remove a photoelectron from the metal is ______ nm. Nearest integer
[Given : $$h = 6.63 \times 10^{-34}$$ J s, and $$c = 3 \times 10^{8}$$ m s$$^{-1}$$]
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The hybridization of P exhibited in $$PF_5$$ is $$sp^x d^y$$. The value of $$y$$ is ______
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$$4.0$$ L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is $$20$$ L. The amount of heat absorbed in this expansion is ______ L atm.
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A $$2.0$$ g sample containing $$MnO_2$$ is treated with HCl liberating $$Cl_2$$. The $$Cl_2$$ gas is passed into a solution of KI and $$60.0$$ mL of $$0.1$$ M $$Na_2S_2O_3$$ is required to titrate the liberated iodine. The percentage of $$MnO_2$$ in the sample is ______ Nearest integer
[Atomic masses (in u) Mn = 55; Cl = 35.5; O = 16, I = 127, Na = 23, K = 39, S = 32]
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In the estimation of bromine, $$0.5$$ g of an organic compound gave $$0.40$$ g of silver bromide. The percentage of bromine in the given compound is ______ % (nearest integer)
(Relative atomic masses of Ag and Br are 108u and 80u, respectively).
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The vapour pressures of two volatile liquids A and B at $$25°$$C are $$50$$ Torr and $$100$$ Torr, respectively. If the liquid mixture contains $$0.3$$ mole fraction of A, then the mole fraction of liquid B in the vapour phase is $$\frac{x}{17}$$. The value of $$x$$ is ______
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The solubility product of a sparingly soluble salt $$A_2X_3$$ is $$1.1 \times 10^{-23}$$. If specific conductance of the solution is $$x \times 10^{-3}$$ S m$$^2$$ mol$$^{-1}$$. The value of $$x$$ is ______
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The quantity of electricity in Faraday needed to reduce $$1$$ mol of $$Cr_2O_7^{2-}$$ to $$Cr^{3+}$$ is ______
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For a first order reaction A $$\to$$ B, the rate constant, $$k = 5.5 \times 10^{-14}$$ s$$^{-1}$$. The time required for $$67\%$$ completion of reaction is $$x \times 10^{-1}$$ times the half life of reaction. The value of $$x$$ is ______ Nearest integer) (Given : $$\log 3 = 0.4771$$)
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Number of complexes which will exhibit synergic bonding amongst, $$[Cr(CO)_6], [Mn(CO)_5]$$ and $$[Mn_2(CO)_{10}]$$ is ______
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