How many grams of sucrose must be added to 320 g of water to lower the vapour pressure by 1.5 mm Hg at \[25{}^\circ C\]? [Given: The vapour pressure of water at \[25{}^\circ C\] is 23.8 mm Hg and the molar mass of sucrose is \[342.3\text{ }g/mol]\]
Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\]with copper ions in alkaline solution but not in acidic solution. The probable reason for this is
A)
In acidic solution, hydration protects \[C{{u}^{2+}}\] ion
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B)
In acidic solution, proton coordinates with ammonia molecules to from \[NH_{4}^{+}\] ions and \[N{{H}_{3}}\] Molecules are not available
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C)
In alkaline solution, insoluble \[Cu{{\left( OH \right)}_{2}}\] is precipitated which is soluble in excess of any alkali.
For the reaction : \[4P\to 3Q\,\,+R\], \[if\,\frac{-d[P]}{dt}\,\,={{k}_{1}}{{[P]}^{4}},\frac{d[Q]}{dt}\,\,={{k}_{2}}{{[P]}^{4}}and\frac{d[R]}{dt}={{k}_{3}}{{[P]}^{4}}\] Which of the following is the most appropriate relation between \[{{k}_{1}},{{k}_{2}},{{k}_{3}}\]?
Na and Mg crystallize in bcc and fee type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystals is
If the masses of hydrogen atom and neutron are 1.0078 and 1.0087 amu respectively, then the total binding energy of \[_{7}^{14}N\] would be (Given, \[_{7}^{14}N=14.0031\] amu and 1 amu = 931 MeV)
In solid ammonia, each \[N{{H}_{3}}\] molecule has six other \[N{{H}_{3}}\]molecules as nearest neighbours. \[\Delta H\] of sublimation of \[N{{H}_{3}}\]at the melting point is\[30.8\,\,\,kJ\,\,\,mo{{l}^{-1}}\], and the estimated \[\Delta H\] of sublimation in the absence of hydrogen bonding is 14.4 kJ mol-1. Strength of H-bond in solid \[N{{H}_{3}}\] is approximately
0.001 mol of \[Co{{(N{{H}_{3}})}_{5}}(NO)S{{O}_{4}}\] was passed through a cation exchanger and the acid coming out of it required 20 mL of 0.1 M NaOH for neutralisation. Hence, the complex is
100 mL of a buffer of \[1\,\,M\,\,N{{H}_{3}}(aq)\] and \[1\,\,M\,\,N{{H}_{4}}^{+}(aq)\] is placed in two voltaic cells separately. A current of 1.5 A is passed through both the cells for 20 minutes. If electrolysis of water only takes place \[2{{H}_{2}}O+{{O}_{2}}+4{{e}^{-}}\to 4O{{H}^{-}}\,\,\,(RHS)\] \[2{{H}_{2}}O\to 4{{H}^{+}}+{{O}_{2}}+4{{e}^{-}}\,\,\,(LHS)\]
An alkyi halide with molecular formula, \[{{C}_{6}}{{H}_{13}}Br\] on treatment with alcoholic KOH gave two isomeric aikenes. Reductive ozonolysis of the mixture gave the following compounds: \[C{{H}_{3}}COC{{H}_{3}},C{{H}_{3}}CHO,C{{H}_{3}}C{{H}_{2}}CHO\]and \[{{\left( C{{H}_{3}} \right)}_{2}}\]\[CHCHO\] The alkyi halide is