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Rg. 2019-20, PACE iT. MEDICAL, MOLE CONCEPT, At NTP 1.0 g of hydrogen gas has volume in litre:, (B) 22.4, 13., 40111.2, (A) 1.12, (C) 2.24, JAng of gold was recovered from a smuggler. The atoms of gold recovered are: (Au = 10, (A) 10, 14., (D) 6.02 * 1025, (C) 6.02 x 1024, (B) 6.02 x 1023, The molecular mass of CO, is 44 amu and Avogadro's number is 6.02 x 10. Therefore, of one molecule of CO2 is:, 15., (D) 2.01 x 10-23, (A) 7.31 x 10-23, (C) 1.01 x 10-23, (B) 3.65 x 10-23, The number of moles of H, in 0.224 litre of hydrogen gas at NTP is:, (A) 1, 16., lie o.01, (D) 0.001, (B) 0.1, 17., Choose the wrong statement:-, (A) 1 Mole means 6.02 x 10 particles, (B) Molar mass is mass of one molecule, (C) Molar mass is mass of one mole of a substance, (D) Molar mass is molecular mass expressed in grams, 3 mol of ammonia contains:, (A) 18 gm of hydrogen, (C) both, 18., 42 gm of nitrogen, (D) None, Total no. of protons in 36 ml of water at 4°C (where p of water = 1 g/ml) is, (A) 20, 19., (B) 16, (C) 20 NA, (D) 16NA, 20., In which of the following pairs both members have same no, of atoms, (A) 1 gm O2, 1 gm O3, (B) 1 gm N2, 2 gm N, (D) None, 0 (C) Both, 21., The molecular wt. of green vitriol is Mo. The wt. of 10 NA molecules of it is, (A) Mo gm, (B) Mo mg, (C) 10° Mo gm, (D) 10 Mo mg, Which of the following has the highest mass, (A) 1g atom of C, 22., (B) ½ mole of CH4, (C) 10ml of H2O, (D) 3.011x10 atom c, Which one of the following samples contains the largest number of atoms., (A) 2.5 mole CH4, 23., (B) 10 mole He, (C) 4 mole SO2, (D) 1.8 mole Sg, 24., The no. of atoms in 52 a.m.u. of He is, (A) 13x1023, (B) 1.3x1023, (C) 13, (D) 103, The no. of electrons in 2 gm ion of nitrate ion (NO,) is, (A) 64, 25., (B) 64NA, (C) 32, (D) 32NA, The mass of carbon present in 0.5 moles of Ka[Fe(CN)6)] is, (A) 1.8 g, 26., (B) 18 g, (C) 3.6 g, (D) 36 g, 27., The largest no. of molecules is in, (A) 28 g of CO2, (B) 46 g of C2H,OH (C) 36 g of H20, (D) 54 g of N20s, How many electrons are present in 180 gm. of water, (A) 1 NA, 28., (B) 10 NA, (C) 18 NA, (D) 100 NA, CENTERS: MUMBAI/DELHI/AKOLA /LUCKNOW /NASHIK /PUNE /NAGPUR /BOKARO

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PACE IT MEDICAL, MOLE CONСЕРТ, 29., (A) 3x1026, How many molecules of H;0 are contained In 2,.48 g of Na,S,0, 5H,0 (at.wt. of Na-23,5%332), The no, of silver atoms present in a 90% pure silver wire weighing 10 g. is (at.wt. of Ag-108), Rg. 2019-2021, (B) 3x1021, (C) 3x10, 30., (D) 3x10, (A) 8x102, e pumber of molecules of water in 333 g of Al2(SO).18H,O is, (B) 0.62x1023, (C) 5x102, (D) 6.2x109, 31., (A) 18x6.02x1023, The number of water molecules present in a drop of water weighing 0.018 g is, 32., (A) 6.02x 1026, LBx6.02x10 •. (C) 18, (D) 36, (B) 6.02x1023, (C) 6.02x1020, 33., JE NA is Avogadro's number, then the number of valence electrons in 4.2 g of nitride ion (Nº ) is, (Given One atom of N has 5 valence electrons), (D) 6.02x109, (A) 2.4 NA, (B) 4.2 NA, (C) 1.6 NA, 34., A person adds 3.42 of sucrose (C12H22011) in his cup of tea to sweeten it. How many atoms of, carbon does he add?, (D) 3.2 NA, (A) 132.44 x 10 atoms, (C) 0.1 atoms, (B) 66.22 x 1021 atoms, (D) 72.27 x1021 atoms, The total number of protons in 8.4 g of M9CO, is (NA = 6.02x102):, 35., (A) 2.52x1022, (B) 2.52x1024, (C) 3.01x1024, (D) 3.01x1022, 36., 44gof CO, and 2.24 litre of H, at NTP are mixed in a container. The total number of molecules, present in the container will be, (A) 6.022 x1023, (B) 1.2044 x1023, (C) 2mole, (D) 6.023x1024, 37., Which sample contains the largest number of atoms:, (A) 1mg of C,H10, (B) 1mg of N2, (C) 1mg of Na, (D) ImL of water, The atomic weight of a triatomic gas is a. The correct formula for the number of moles of gas in its, w gram is:, 3w, (A), 38., W, (B), За, a, (D), 3w, (C) 3wa, a, 39., Number of atoms in 558.5g Fe(at.wt 55.85) is:, A) Twice that in 60g carbon, 1:8, (B) 6.023x1022, (C) Half in 8g He, (D) 558.5x6.023x1023, How many moles of magnesium phosphate, Mg, (PO4), will contain 0.25mole of oxygen atoms?, 25, Sue, 40., (A) 0.02, JB) 3.125x10, (C) 1.25x10-2, (D) 2.5x10-2, 3., EMPIRICAL AND MOLECULAR FORMULA, The simplest formula of a compound containing 50% by mass of element X (at. wt. 10) and 50% by, mass of element Y (at. wt. 20) is;, (A) XY, 41., (B) X2Y, (C) XY2, (D) X,Y3, The hydrated salt NazSO4-10H2O undergoes X% loss in weight on heating and becomes anhydrous, The value of X will be, 42., CENTERS: MUMBAI/DELHI /AKOLA /LUCKNOW /NASHIK /PUNE /NAGPUR /BOKARO /DUBAI # 12, 6-757

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LAWS OF CHEMICAL COMBINATIONS, (D) the number of different types of atoms in a molecule, The chemical formula of a particular compound represents:, mass of hydrogen. This is explained by the law of:, HS contains 5.88% hydrogen, H2O contains 11.11% hydrogen while SO2 contains 50% sulphur., Potassium combines with two isotopes of chlorine (Cl and SCI) respectively to form two samples, AC) the total number of atoms in a molecule, of KCI. Their formation follows the law of:, These figures illustrate the law of:, Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11%, MOLE CONCEPT, FOUNDATION BUILDER (OBJECTIVE PROBLEM), Rg. 2019-2021, 1., JA) constant proportions, c) reciprocal proportions, (B) multiple proportions, D)none of these, 2., (A) conservation of mass, (C)multiple proportions, (B) constant proportions, Dreciprocal proportions, 3., JANconservation of mass, C) multiple proportion, UBT constant composition, (D) constant volume, MOLE CONCEPT, The best standard of atomic mass is:, 4., JAY carbon-12, (B) oxygen-16, (C) hydrogen-1.008 (D) chlorine-35.5, 5., (A) the size of its molecule, (B) the shape of its molecule, Two containers P and Q of equal volume (1 litre each) contain O2 and SO2 respectively at 300 K, 6., and 1 atmosphere. Then, (A) Number of molecules in P is less than that in Q, (B) Number of molecules in Q is less than that in P, (C) Number of molecules in P and Q are same, (D) Either (A) or (B), 7., 7.5 grams of a gas occupy 5.6 litres of volume at STP. The, gas is, (A) NO, (B) N20, (C) CO, (D) CO2, 3., The weight of a molecule of the compound CeoH122 is, (A) 1.4 x 10-21, (B) 1.09 x 102 g, (C) 5.025 x 102 g, (D) 16.023 x 10 g, 1.0 mole of CO2 contains:, NAT6.02 x 1023 atoms of C, (C) 18.1 x 1023 molecules of CO2, (B) 6.02 x 102 atoms of O, (D) 3 g-atoms of CO2, 0., The number of atoms in 1.4 g nitrogen gas is:, (A)6.02 x 1022, (B) 3.01 x 102, (C) 1.20 x 1023, (D) 6.02 x 1023, Which of the following has the smallest number of molecules?, (A) 22.4 x 10° ml of CO2 gas =) 16x1023 (B) 22 g of CO2 gas, (C) 11.2 litre of CO2 gas, 1., 23, D)0.1 mole of CO2 gas, The number of grams of H2SO4 present in 0.25 mole of H2SO4 is, (A) 0.245, 2., (D) 49.0, (B) 2.45, C) 24.5, ENTERS: MUMBAI/DELHI /AKOLA /LUCKNOW /NASHIK /PUNE /NAGPUR /BOKARO /DUBAI # 124