question_answer3) Gaseous \[{{N}_{2}}{{O}_{4}}\] dissociates into gaseous \[N{{O}_{2}}\]according to the reaction \[{{N}_{2}}{{O}_{4}}(g)\rightleftharpoons 2N{{O}_{2}}(g)\] At 300 K and 1 atm pressure, the degree of dissociation of \[{{N}_{2}}{{O}_{4}}\] is 0.2. If one mole of \[{{N}_{2}}{{O}_{4}}\] gas is contained in a vessel, then the density of the equilibrium mixture is:
JEE Main Online Paper (Held On 10 April 2015)
question_answer5) The correct statement on the isomerism associated with the following complex ions, \[{{[Ni{{({{H}_{2}}O)}_{5}}N{{H}_{3}}]}^{2+}},\] \[{{[Ni{{({{H}_{2}}O)}_{4}}{{(N{{H}_{3}})}_{2}}]}^{2+}}\]and \[{{[Ni{{({{H}_{2}}O)}_{3}}{{(N{{H}_{3}})}_{3}}]}^{2+}}\]is:
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question_answer7) 1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of \[M/10\,{{H}_{2}}S{{O}_{4}}\] solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution tor neutralization. The percentage of nitrogen in the compound is:
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question_answer11) If the principal quantum number n = 6, the correct sequence of filling of electrons will be:
JEE Main Online Paper (Held On 10 April 2015)
question_answer13) A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is : (atomic mass, Ba = 137 amu, Cl=35.5 amu)
JEE Main Online Paper (Held On 10 April 2015)
question_answer15) Match the polymers in column-A with their main uses in column-B and choose the correct answer :
JEE Main Online Paper (Held On 10 April 2015)
question_answer17) In the long form of the periodic table, the valence shell electronic configuration of \[5{{s}^{2}}5{{p}^{4}}\]corresponds to the element present in:
JEE Main Online Paper (Held On 10 April 2015)
question_answer18) The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them :
JEE Main Online Paper (Held On 10 April 2015)
A)
On adsorption, the residual forces on the surface are increased
doneclear
B)
Enthalpy of adsorption is negative
doneclear
C)
On adsorption decrease in surface 3 energy appears as heat
question_answer19) A variable, opposite external potential \[({{E}_{ext}})\] is applied to the cell\[Zn|Z{{n}^{2+}}(1M)||C{{u}^{2+}}(1M)|Cu,\]potential 1.1 V. When \[{{E}_{ext}}<1.1V\] and \[{{E}_{ext}}>1.1V,\]respectively electrons flow from :
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question_answer20) An aqueous solution of a salt X turns blood red on treatment with \[SC{{N}^{-}}\] 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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question_answer21) photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth- X is :
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question_answer22) In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which \[\text{ }\!\!\alpha\!\!\text{ -}\]hydrogen has been replaced by halogen. This reaction is known as :
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question_answer23) The cation that will not be precipitated by \[{{H}_{2}}S\] in the presence of dil \[HCl\]is :
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question_answer25) The reaction \[2{{N}_{2}}{{O}_{5}}(g)\to 4N{{O}_{2}}(g)+{{O}_{2}}(g)\]follows first order kinetics. The pressure of a vessel containing only \[{{N}_{2}}{{O}_{5}}\] 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) :
JEE Main Online Paper (Held On 10 April 2015)
question_answer26) 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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question_answer27) 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 K.OH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not aldol condensation. U gives aldol condensation but not Cannizaro reaction. A is :
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question_answer29) The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number \[=6.02\times {{10}^{23}},h=6.62\times {{10}^{-34}}Js\])
JEE Main Online Paper (Held On 10 April 2015)
question_answer30) 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.
JEE Main Online Paper (Held On 10 April 2015)
A)
Assertion and reason are correct and Option reason is the correct explanation for the assertion.
doneclear
B)
Assertion is incorrect, reason is correct.
doneclear
C)
Assertion and reason are correct, but reason is not the correct explanation for the assertion.