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question_answer1) Mixture of sand and sulphur may best be separated by [Kerala CET 2001]
question_answer2) 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 [Kerala CEE 2002]
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) 10 \[d{{m}^{3}}\]of \[{{N}_{2}}\]gas and 10 \[d{{m}^{3}}\]of gas X at the same temperature contain the same number of molecules. The gas X is
question_answer5) The molar heat capacity of water at constant pressure is 75 \[J{{K}^{-1}}\,\,mo{{l}^{-1}}\]. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increases in temperature of water is [CBSE PMT 2003]
question_answer6) A compound possesses 8% sulphur by mass. The least molecular mass is [AIIMS 2002]
question_answer7) Which of the following contains maximum number of atoms [JIPMER 2000]
question_answer8) In a mole of water vapour at STP, the volume actually occupied or taken by the molecules (i.e., Avogadro?s No. \[\times \] Volume of one molecule) is [Kerala EEE 2000]
question_answer9) If \[{{10}^{21}}\]molecules are removed from 200mg of \[C{{O}_{2}}\], then the number of moles of \[C{{O}_{2}}\]left are [IIT 1983]
question_answer10) The set of numerical coefficient that balances the equation\[{{K}_{2}}Cr{{O}_{4}}+HCl\to {{K}_{2}}C{{r}_{2}}{{O}_{7}}+KCl+{{H}_{2}}O\] is [Kerala CEE 2001]
question_answer11) One litre hard water contains 12.00 mg \[M{{g}^{2+}}\]milli equivalent of washing soda required to remove its hardness is [CBSE PMT 2001]
question_answer12) In standardization of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] using \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] by iodometry, the equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is [IIT 2000]
question_answer13) 3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of \[KMn{{O}_{4}}\] during titration for complete oxidation. The weight of \[KMn{{O}_{4}}\] present in one litre of the solution is [Tamilnadu CET 2002]
question_answer14) A 100 ml solution of 0.1 n HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is [DCE 1999]
question_answer15) What volume of Hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by Hydrogen [AIEEE 2003]
question_answer16) The mass of \[112\ c{{m}^{3}}\] of \[C{{H}_{4}}\] gas at STP is [Karnataka CET 2001]
question_answer17) Complete combustion of \[0.858\ g\] of compound X gives \[2.63\ g\] of \[C{{O}_{2}}\] and \[1.28\ g\] of \[{{H}_{2}}O\]. The lowest molecular mass X can have [Kerala MEE 2000]
question_answer18) In the following reaction, which choice has value twice that of the equivalent mass of the oxidising agent \[S{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}3S+2{{H}_{2}}O\] [DPMT 2000]
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