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question_answer1) X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{3}}\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of \[X\] and\[Y\] Fare respectively
question_answer2) The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
question_answer3) Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be
question_answer4) A gaseous mixture contains \[C{{O}_{2}}(g)\] and \[{{N}_{2}}O(g)\] in 2 : 5 ratio by mass. The ratio of the number of molecules of \[C{{O}_{2}}(g)\]and \[{{N}_{2}}O(g)\]is
question_answer5) The minimum quantity in gram of \[{{H}_{2}}S\] needed to precipitate 63.5 g of \[C{{u}^{{{2}^{+}}}}\] will be \[(C{{u}^{{{2}^{+}}}}+{{H}_{2}}S\to C{{u}_{2}}S+{{H}_{2}})\] Black
question_answer6) The mass of 70% \[{{H}_{2}}S{{O}_{4}}\] required for neutralisation of 1 mol of NaOH.
question_answer7) For the reaction \[2x+3y+4z\to 5w\] Initially if 1 mole of x, 3 moles of y and 4 moles of z is taken. If 1.25 moles of w is obtained then % yield of this reaction is
question_answer8) Which of the following changes with increase in Temperature?
question_answer9) Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
question_answer10) A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \[C{{O}_{2}}\] The empirical formula of the hydrocarbon is
question_answer11) To neutralize completely 20 mL of 0.l M aqueous solution of phosphorus (\[{{H}_{3}}P{{O}_{3}}\]) acid the volume of 0.1 M aqueous KOH solution required is
question_answer12) 1.0 g of a monobasic acid when completely acted upon Mg gave 1.301 g of anhydrous Mg salt. Equivalent weight of acid is
question_answer13) If 0.5 mole of \[BaC{{l}_{2}}\]is mixed with 0,20 mole of \[N{{a}_{3}}P{{O}_{4}}\], the maximum number of moles of\[B{{a}_{3}}(P{{O}_{4}})\] that can be formed is
question_answer14) 5.6 g of a metal forms 12.7 g of metal chloride. Hence equivalent weight of the metal is
question_answer15) The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is:
question_answer16) Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is
question_answer17) \[Br{{O}_{3}}^{\odot }+5B{{r}^{\odot }}\to B{{r}_{2}}+3{{H}_{2}}O\]If 50 mL 0.1 M \[Br{{O}_{3}}^{\odot }\] is mixed with 30 mL of 0.5 M \[B{{r}^{\Theta }}\]solution that contains excess of \[{{H}^{\oplus }}\] ions, the moles of \[B{{r}_{2}}\] formed are
question_answer18) A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data support
question_answer19) Given that the abundance of isotopes \[^{54}Fe\], \[^{56}Fe\] and \[^{57}Fe\] is 5%, 90% and 5%, respectively. The atomic mass of Fe is
question_answer20) Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
question_answer21) A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 ml and 25.0 mL. The number of significant figures in the average titre value is
question_answer22) Valency factors for \[C{{u}_{2}}S\] and \[C{{u}_{{}}}S\] is x and y respectively when they react with KMn\[{{O}_{4}}\] in acidic medium. What is the value of x- y?
question_answer23) How many \[{{N}_{4}}\] electron is present in 5.1 g \[N{{H}_{3}}\] ?
question_answer24) 29.2 % (w/w) HCl stock solution has density of 1.25 g \[m{{L}^{-1}}\]. The molecular weight of HCl is 36.5 g \[mo{{l}^{-1}}\]. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is
question_answer25) How many litre of 2 M \[{{H}_{3}}As{{o}_{4}}\] require to prepare 4 litres of l M \[{{H}_{3}}As{{o}_{4}}\]?
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