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DAY PRACTICE SESSION 1), , FOUNDATION QUESTIONS EXERCISE, 1 How, nmany, , signiticant tigures, tolowing calculation?, , should be present in the, , 1 A MIxture of 2.3 g formic acid and 4.5 g oxalic acid Is, , trealed with conc. H SO,. The evolved gaseous mixture, , 2.5x 125 x 35, , is passed through KOH pellets. Weight (in g) of the, , 2.01, (a) 2, , (b) 3, , 2Cl and Cl are, atomic mass, (a) 35 37, , 3 if, , two, , (d) 6, , (a) 2.8, , isotopes, , of chlorine. If, average, 35.5, then ratio of these two, isotopes is, , is, , (b) 1 3, , (c) 3: 1, , (NA = 6.02 x 10, , (d) 2: 1, , number Na, is changed from, to 6.022 x, 10mol this would, (a) the definition of mass in units of, (b) the mass of one mole ot carbon grams, (c) the ratio of chemical species to each other in a, , x1o mol', , change, , (d), , the ratio of elements to each other, , in a, , 7 The, , sample of commercial sulphuric acid is 98% HSO4 by, mass. The mole fractions of HSO, and HO are, , (a)09.0.1 (b)0 1,09, 16 Mass of one atom of X, equal to, (a) 32x 2 66x 10, , (b), , (b).4, , (c) 1, (d) 3, 9 One mole of any substance contains, 6 022 x 10, atoms/molecules. Number of molecules of H SO, present, in 100 mL of 0. 02M HSO, solution is, , (c) 1x 10, , molecules, , 6 022, , x, , 10 molecules, , (d) 12044 x 10 molecules, , 10 6.02 x 10 molecules of urea are present in 100mL. of its, solution. The concentration of solution is, NEET 2013, (a) 0.02 M, , (b) 001 M, , (c) 0 001 M, , (d)0.1 M, , 11 In which case is the number of molecules of water, maximum?, , 10g., , (d) 0.8. 0.2, then its 32 g, , is, , mol, , 32, , 602 x 10, , 17, , (c) 41, , (a) 12044 x 10 molecules (b), , (c)02, 0.8, 2 66x, , (d) None of the above, , (d) 20.5, 8 0.45 g acid of molecular, weight 90 was neutralise by, 20 mL of 0.5 N KOH. The basicity of acid is, ) 2, , is, , 266x 10x 6.023x 103, , (d) 6.0, , of, , (b)615, , 1 mole, , (c)32 x2 66 x10 23 moi, , (c) 50, , equivalent weight HPO when it, disproportionates into PH3 and HPO, is, (a) 82, , (d) 1.800x 102, , 15 A, , density is 70, the value of x is, (b) 3.0, , (c) 3.600x 1023, , CBES-AIPMT 2014, , (d) MO, , (a) 2.3, , CBSE-AIPMT 2010, , (b) 1.806x 1023, , of HCI (g), (b) 2 moles of HCI (g), (c) 0.5 mole of HCI (g), (d) 1.5 mole of HCi (g), , a, , 5 In an experiment, 4 of, g, MO, oxide was reduced to, 28 gof the, metal. If the atomic mass of the metal is, 56 g mol, the number of O-atoms in, the oxide is, (a) 1, (b) 2, (c) 3, (d) 4, 6 A gas is found to have a formula, (CO), If its vapour, , mol), , (a) 6 026x 10, , (a), , compound, , metal contain 53.4% and 36.4% of, oxygen by mass respectively. If the formula of first oxide, is MO, then that of the, second is, (a) MO, (b) MO, (c) MO, , (d) 4.4, , (c) 1.4, , 14 When 22.4 L of, H(g) is mixed with 11.2 L of Cl,g) each, at STP, the moles of HCI (g) formed is equal to, , balanced equation, , 4 Two oxides of, , (b) 30, , 13 The number of atoms in 0.1 mole of a triatomic gas is, , Avogadro, , 6.022, , - NEET 2018, , remaining products at STP will be, , (c) 4, , NEET 2018, , (a) 0 00224 L of water vapours at 1 atm and 273 K, (b) 0 18 g of water, (c) 18 mL of water, (d) 10 mol of wator, , Equal volumes of 0, , 1 M AgNO and 02 M NaCl are, mixed The concentration of, NO Ions in the mixture, , will be, , (a) 01 M, , (b) 0.05 M, (d) 0.15 M, , (c) 02 M, , 18 Concentrated aqueous, sulphuric acid is 98% HSO, by, mass and has a, density of 1.80 g mL". Volumne of acid, required to make one litre of 0 1 MHSO, solution is, , (a) 11.10 mL, (c) 22.20 mL, , 19 What, , is, , the, , percentage, , (b) 1665 ml, (d) 5.55 mL, of cation, , dichromate?, (a) 14.29%, (c) 50 05%, , 20 The, 2%,, , in, , ammonium, , (b) 80%, (d) 2052%, , isotopic abundance ofC-12, , and C-14, , is, , 98% and, , What would be the number of, respectively., C-14, in, , isotope, , 12 g carbon, , (a) 1032x 1022, (c) 5 88 x 102, , sample?, , (b) 301x 1023, (d) 6 02x 1023

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21, , What volume, , 73g, , of a, solution of, of acid, per litre would, , neutralisation of, 0 46 g of, , (Cl, , sodium, , 35.5, Na-, , 23 0, 0, , 22, , acid, , sutficient for exact containin, hydroxide obtained by allowing, , metallic sodum, , (a) 10 m, (c) 30 ml, , hydrochioric, , to act upon, , water?, , (d) 40 ml, , the olements Xand Y, combine to torm two, and X,Y, When 0 1 mole of, XY, weighs, 10 g and 005 mole, of X,Y,, the atomIc, , compounds XY2, , weighs 9 g., , NEET 2016, Phase, (b) 60, 40, (d) 30, 20, , 23 The weight of iron which will be, converted into its oxide, (FeJ0,) by the action of 18 g of steam on it will be, (atomic weight of Fe= 56), 24, , (b) 84 g, , 10g of magnesium, , is, , (c) 42 g, , burnt, , with O.56 g O,, , (d) 21 g, in a, , closed, , vessel. Which reactant is left in excess and how much?, (a) Mg. 0.16 g, , (b) Op, 0. 16 g, , (c) Mg. O 44 g, , (d) O, 028 g, , molecules are removed from 200mg of cO The, , ceflain f h g s s, , STP, , o, , th0, , CO,, , CtO, , ol, , nass, , of, , KOH, , is, , ( ) 28 y, , (d) 29 y, , many, contain, , rnolos, , of, , nagnoshui, , 0.25 nolo, , of oAYyon, , phosphaty, Ma, , o, , atorns?, , (0) 002, , (b) 3 125 10, , (c) 125x 10, (d) 25 x, , 10, , 29-30) Euch, , Direction (Q. Nos., , of thene, , quentiona, , cont., , n, of thene c, two n t a t e m e n t a :, 4, choicen, only o n e of whie,, the, also has four alternative, o e of the coden (u),, have, a n s w e r . You, t select, Each, StatementI and II., , correct, , and (d) given belouw., Statenont I is truo,, , (a), , Stalernent I16, , for Statorment, correct explanation, Stalorment l ls, , (b)Statornont I is, not a corect, , true,, explanation lor, , true,, , Slaternent, , ns, , truo, Staternent llie, , Staternent, , truo, Statoment I is fals, Stalerment Il is tru, I, is, fals0,, (d) Stalornent, Staternent, , I ls, , 29 Statement I Equivalent weight of ozone in the change, , Og0, is 8., Statement II 1 mole of O, on decomposition gives, , moles of CO, left are, (a) 288x 10, , (b) 28.8x 10, , (c) 288 x 103, , (d) 28.8 x 10, , 26 An aqueous solution of glucose is 10% in strength. The, volume in which 1g mole of it is dissolved will be, (a) 18L, (c) 0.9 L, , will, , (c), , (At wt. of Mg = 24, O = 16), , 25 10, , a, , gas al, 112dm'of CO,, routralise, Complotoly, to, , 28 How, , Suppose, , (a) 168 g, , of, , (C) 42 g, , (b) 20 ml, , (a) 40. 30, (c) 20, 30, , docomposition, , () 56 9, , 16), , weights of X and Y are, , 27 The, , (b) 92 L, (d) 1.8 L, , moles, ofO, 2, 30 Statement I The molality of the solution does not, with change in temperature., , change, , Statement lI The molality of the solution is expressed n, units of moles per 1000 g of solvent.