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question_answer1) An atom of element \['X'\] is 1.02 times heavier than that of an atom of \['Y'\] . An atom of \['Y'\] is 0.1809 times heavier than that of an atom of oxygen. What is the atomic weight of \['X'\] ?
question_answer2) A gas container contain 35 gm nitrogen gas, 64 gm \[{{O}_{2}}\] gas and 0.112 lit of \[C{{H}_{4}}\] at STP, what is average molecular weight of the gas mixture?
question_answer3) A mixture of \[HCOOH\] and \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] is heated with conc \[{{H}_{2}}S{{O}_{4}}\] . The gas produced is collected and on treating with \[KOH\]solution the volume of the gas decreases by \[\frac{1}{6}\] th. Calculate molar ratio of two acids in original mixture.
question_answer4) How many grams of copper will be replaced in 2 L of a \[1.50-M\text{ }CuS{{O}_{4}}\] solution if the latter is made to react with 27.0 g of aluminium? \[\left( Cu\,\,=\,\,63.5,\,\,Al\,\,=27.0 \right)\]\[\left( 3CuS{{O}_{4}}\,\,+\,\,2Al\,\,\to \,\,A{{l}_{2}}\,{{\left( S{{O}_{4}} \right)}_{3}}\,\,+\,\,3Cu \right)\]
question_answer5) 12 litre of \[{{H}_{2}}\] and 11.2 litre of \[C{{l}_{2}}\] are mixed and exploded. The volume of \[{{H}_{2}}\] in the mixture is -
question_answer6) The ratio of the molar amounts of \[{{H}_{2}}S\] needed to precipitate the metal ions from 20 ml each of 1M \[Cd{{(N{{O}_{3}})}_{2}}\] and \[0.5\,\,M\,\,CuS{{O}_{4}}\] is- \[(Cd{{(N{{O}_{3}})}_{2}}\,\,+\,\,{{H}_{2}}S\,\,\to \,\,CdS\,\downarrow \,\,+\,\,2HN{{O}_{3}})\]
question_answer7) Calculate the weight of \[BaC{{l}_{2}}\]needed to prepare 250 mL of a solution having the same concentration of \[C{{l}^{-}}\] ions as in a solution of \[KCl\]of concentration 80 g/L. \[{{(Ba\,\,=\,\,137.4Cl\,\,=\,\,35.5)}^{-}}\]
question_answer8) What volume of \[0.4M\,\,\,\,FeC{{l}_{3}}.6{{H}_{2}}O\] will contain 600 mg of \[F{{e}^{3+}}\]?
question_answer9) One litre of milk weighs 1.035 kg. The butter fat is 4% in volume of milk has density of \[875\,\,kg\,/\,{{m}^{3}}.\] Find the density of fat free skimed milk
question_answer10) A particular 100-octane aviation gasoline used 1 cc of \[{{\left( {{C}_{2}}{{H}_{5}} \right)}_{4}}Pb,\] of density 1.66 gm/cc, per litre of gasoline. \[{{({{C}_{2}}{{H}_{5}})}_{4}}Pb,\] is made as follows : \[4\,\,{{C}_{2}}{{H}_{5}}Cl\,\,+\,\,4NaPb\,\,\to \,\,{{\left( {{C}_{2}}{{H}_{5}} \right)}_{4}}Pb\,\,+\,\,4NaCl\] How many gram of \[{{C}_{2}}{{H}_{5}}Cl\]is needed to make enough \[{{({{C}_{2}}{{H}_{5}})}_{4}}Pb\] for 10 litre of gasoline, (atomic mass of \[Pb\,\,=\,\,206\])
question_answer11) 1 gram of a carbonate \[\left( {{M}_{2}}C{{O}_{3}} \right)\] on treatment with excess \[HCl\]produces 0.01186 mole of \[C{{O}_{2}}.\]The molar mass of \[{{M}_{2}}C{{O}_{3}}\] in \[g\text{ }mo{{l}^{-1}}\]is -
question_answer12) The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%) and Nitrogen (2.6%). The weight which a 75 kg person would gain if all \[{}^{1}H\] atoms are replaced by \[{}^{2}H\] atoms is
question_answer13) Excess of \[NaOH\,\,\left( aq \right)\] was added to 100 mL of \[FeC{{l}_{3}}\,\,\left( aq \right)\] resulting into 2.14 g of \[Fe{{\left( OH \right)}_{3}}.\] The molarity of \[FeC{{l}_{3}}\,\,\left( aq \right)\] is (Given molar mass of \[Fe\,\,=\,\,56\,\,g\,\,mo{{l}^{-1}}\] and molar mass of \[Cl\,\,=\,\,35.5\,\,g\,\,mo{{l}^{-1}}\])
question_answer14) Zinc metal reacts with hydrochloric acid by the following reaction: \[Zn\,\,\left( s \right)\,\,+\,\,2HCl\,\,\left( aq \right)\,\,\to \,\,ZnC{{l}_{2}}\,\,\left( aq \right)\,\,+\,\,{{H}_{2}}\left( g \right)\] If 0.30 mol Zn is added to hydrochloric acid containing 0.52 mole\[HCl\]. How many moles of \[{{H}_{2}}\] produced.
question_answer15) A compound which contains one atom of X and two atoms of Y for each three atoms of Z is made by mixing 5.00 g of X, \[1.15\,\,\times \,\,{{10}^{23}}\] atoms of Y and 0.03 mole of Z atoms. Given that only 4.40 g of compound results. Calculate the atomic weight of Y if the atomic weight of X and Z are 60 and 80 a.m.u. respectively.
question_answer16) Water is evaporated from 135 mL of 0.224 M \[MgS{{O}_{4}}\] solution until the solution volume becomes 105 mL. What is the molarity of \[MgS{{O}_{4}}\]in the solution that results?
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