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Which one of the followings has maximum, number of atoms ? [2020], (a) | g of Mg(s) [Atomic mass of Mg = 24], , (b) 1 g of O,(g) [Atomic mass of O = 16], , (c) 1 g of Li(s) [Atomic mass of Li = 7], , (d) | gofAg(s) [Atomic mass of Ag = 108], The number of moles of hydrogen molecule, required to produce 20 moles of ammonia, , through Haber’ s process is: [2019], (a) 10 (b) 2, (c) ® (d) #0, In which case is number of molecules of water, maximum? [2018], , (a) 18 mL of water, , (b) 0.18 g of water, , (c) 107 mol of water, , (d) 0.00224 L of water vapours at 1 atm and, , 273K, , A mixture of gases contains H, and O, gases in, the ratio of | 4 (w/w). What isthe molar ratio of, the two gases in the mixture ? [2015], , , , fa) 4:1 (b) 16:1, , (c) 2:1 (d) 1:4, , The number of water molecules is maximum in :, [2015 RS], , {a) 18 molecules of water, , (b) 1.8 gram of water, , (c) 18 gram of water, , (d)_ 18 moles of water, , If Avogadro number Ny, is changed from, , 6.022 = 1073 mol"! to 6.022 = 107° mol this, , would change [2015 RS}, , (a) the definition of mass in units of grams, , (b) the mass of one mole of carbon, , (c) the ratio of chemical species to each other, , in a balanced equation, (d) the ratio of elements to cach other in a, compound, , When 22. a 11.2 litres, , of Cl,(g), each at S.T.P., the moles of HCI(g), , formed is equal to : (2014, , (a) 1 mole of HC/(g), , (b) 2 moles of HC/(g), , (c) 0.5 moles of HC/(g), , (d) 1.5 moles of HC/(g)

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10, , in, , 12, , 14., , 15,, , 16., , 17., , 1.0 g of magnesium is burnt with 0,56 gO, ina, closed vessel. Which reactant is left in excess, , and how much ? [2014], (At. wt. Mg=24; O= 16), , (a) Mg,0.16g (b) 0,,0.162, , (c) Mg,0.44g (d) 0,,0.282, , Which has the maximum number of molecules, among the following ? (2011 M], (a) 44gC0, (b) 4820,, , (c) 82H, (d) 642S0,, , The number of atoms in 0.1 mol of a triatomic, gas is (2010), (N= 6.02 «1073 mol!), , (a) 6.026 = 10 (b) 1.806 = 10, , (c) 3.600 x 107 (d) 1,800 « 107, , What volume of oxygen gas (O,) measured at, 0°C and | atm, is needed to burn completely 1L, of propane gas (C,H,) measured under the same, , conditions ? [2008], (a) 7L (b) 6L, (c) SL (d) 10L, , Number of moles of MnQj required to oxidize, one mole of ferrous oxalate completely in acidic, , medium will be /2008], (a) 0.6moles (b) 04moles, (c) 7.5moles (d) 0.2moles, , Volume occupied by one molecule of water, (density = 1 gcm™) is: (2008), (a) 90*10%cm3 = (b) 6.023 « 10-3 cm}, (c) 30x 10-3 em? (d) 5.5* 10°3 cm, The number of moles of KMnO, that will be, needed to react with one mole of sulphite ion in, acidic solution is (2007), (a) 4/5 (b) 2/5, , {c) 1 (d) 3/5, , An element, X has the following isotopic, composition : [2007], 200 90% 9X: 8.0% 22y: 2.0%, The weighted average atomic mass of the, naturally occuring element X is closest to, , (a) 20lamu (b) 202amu, , (c) 199amu (d) 200amu, , The number of moles of KMnO, reduced by one, mole of KI in alkaline medium is [2005], (a) one (b) two, , (c) five (d) one fifth, , The maximum number of molecules is present in, (a) 15LofH, gasat STP (2004), (b) SLofN, gas at STP, , , , 18., , 19., , 21., , (c) 0S gofH, gas, , (d) 10g of O, gas, , Which has maximum number of molecules?, , (a) 72N, (b) 2gH, 2002], (c) 16gNO, (d) 1620,, , Specific volume of cylindrical virus particle is, 6.02 « 107 ce/g whose radius and length are 7 A, & 10 A respectively. If N, = 6.02 = 1073, find, molecular weight of virus (2001), (a) 3.08 * 10° kg/mol (b) 3.08 « 10*kg/mol, (c) 154*10*kg/mol (d) 15.4kg/mol, Assuming fully decomposed, the volume of CO,, released at STP on heating 9.85 g of BaCO,, , (Atomic mass, Ba= 137) will be 12000], (a) 2241 (b) 4.96L, (c) LI2L (d) O84L, Haemoglobin contains 0.334% of iron by weight., , The molecular weight of haemoglobin is, approximately 67200. The number of iron atoms, (at. wt. of Fe is 56) present in one molecule of, haemoglobin are [1998], (a) 1 (b) 6, , (c) 4 (d) 2, , The number of significant figures for the three, numbers 161 cm, 0.161 cm, 0.0161 cm are, , (a) 3,4 and 5 respectively [1998], (b) 3,4 and 4 respectively, , (c) 3, 3.and 4 respectively, , (d) 3, 3 and 3 respectively, , The weight of one molecule of a compound, CH,» is [1995], (a) 1.2*10%gram = (b) 1.4 « 107! gram, (c) 5.025* 10% gram (d) 6.023 = 10? gram, In the final answer of the expression, , (29.2 -20.2)(1.7910°), 137, , the number of significant figures is, (a) | (b) 2, (c) 3 (d) 4, If N M4 is Avogadro's number then number of, valence electrons in 4.2g of nitride ions (N*>) is, (a) 24N, (b) 42N, = [1994], (c) 16N, (d) 32N,, The molecular weight of O2 and SO, are 32 and, 64 respectively. At 15°C and 150mm Hg pressure,, one litre of O, contains “N’ molecules. The, number of molecules in two litres of SO, under, the same conditions of temperature and pressure, will be: [1990], , 11994]

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43, , 45., , 47, , 49., , In an experiment it showed that 10 mL. of 0.05 M, solution of chloride required 10 mL of 0.1 M, solution of AgNO, which of the following will, be the formula of the chloride (Y stands for the, symbol of the element other than chlorine):, , [NEET Kar. 2013], (a) x,Cl (b) XC,, (c) XC), (d) XCl,, , 6.02 « 107° molecules of urea are present in, 100 mL of its solution. The concentration of, , solution is [NEET 2013], (a) 001M (b) 0.001M, (c) 01M (d) 002M, , What is the [OH] in the final solution prepared, by mixing 20.0 ml. of 0.050 M HC! with 30.0 mL of, , 0.10 M Ba(OH),? [2009], (a) 040M (b) 0.0050M, (c) 012M (d) 0.10M, , 10 g of hydrogen and 64 g of oxygen were filled, in asteel vessel and exploded. Amount of water, , produced in this reaction will be: (2009], (a) 3mol (b) 4mol, (c) Imol (d) 2mol, , How many moles of lead (II) chloride will be, formed from a reaction between 6.5 g of PbO, , and 3.2 gof HCl? /2008], (a) 0044 (b) 0333, (c) O01 (d) 0029, , Concentrated aqueous sulphuric acid is 98%, H,SO, by mass and has a density of 1.80 gmL~!, Volume of acid required to make one litre of 0.1M, , H,SO, solution is [2007], (a) 1665mL (b) 2220mL, (c) 555mL (4) 110m, , The mass of carbon anode consumed (giving, only carbon dioxide) in the production of, 270 kg of aluminium metal from bauxite by the, Hall process is (Atomic mass: Al=27) (2005), (a) 270kg (b) 540kg, (c) 9kg (d) 180kg, , , , , , SI, , 52., , Sa,, , CHEMISTRY, , In Haber process 30 litres of dihydrogen and, , 30 litres of dinitrogen were taken for reaction, , which yielded only 50% of the expected product, , ‘What will be the composition of gaseous mixture, , under the aforesaid condition in the end? /2003/, , (a) 20 litres ammonia, 25 litres nitrogen, 15 litres, hydrogen, , (b) 20 litres ammonia, 20 litres nitrogen, 20 litres, hydrogen, , (c) 10 litres ammonia, 25 litres nitrogen, 15 litres, hydrogen, , (d) 20 litres ammonia, 10 litres nitrogen, 30 litres, hydrogen, , In the reaction, , 4NH, (g) +5 0,(g) +4 NO(g) +6 H,O(/), , When | mole of ammonia and | mole of O, are, , made to react to completion, [1998], , (a) 1.0 mole of H,O is produced, , (b) 1.0 mole of NO will be produced, , (c) all the oxygen will be consumed, , (d) all the ammonia will be consumed, , Liquid benzene (C,H,) burns in oxygen according, , to the equation, , 2C,H() + 150,(g)—> 12CO,(g) + 6H,O(g), , How many litres of O, at STP are needed to, , complete the combustion of 39 g of liquid, , benzene? (Mol. wt. of 0, = 32, C,H, = 78), , 11996], , (a) 74L (b) 112L, , (c) 224L (d) S4L, , A 5 molar solution of H,SO, is diluted from, , | litre toa volume of 10 litres, the normality of, , the solution will be : 11991], (a) IN (b) O.IN, (c) SN (d) O.5N, , One litre hard water contains 12.00 mg Mg?*, Mili-equivalents of washing soda required to, remove its hardness is : /1988], (a) 1, , (c) 1*10%, , (b) 12.16, (d) 12.16 10°

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21., , The correct order of the decreasing ionic radii, , among the following isoelectronic species are :, , (a) Ca** >K* >s* >cr /2010], , (b) Cl >S* >Ca** >k*, , (ce) s* >I" >K* >Ca?*, , (d) K* >Ca** >cr >s*, Amongst the elements with following electronic, , configurations, which one of them may have the, , highest ionization energy? (2009,, , (a) Ne[3s?3p?] (b) Ar [3d!°4s74p3 }, , (c) Ne [3s*3p'] (d) Ne [3s?3p*], , The stability of + 1 oxidation state increases in, , the sequence [2009], , (a) Ti<In<Ga<Al (b) In<TIl<Ga<Al, , (c) Ga<In<Al<TI (d) Al<Ga<In<TI, , Which one of the following ionic species has the, , greatest proton affinity to form stable compound?, , (a) NHZ (b) F [2007], , () F (d) HS, Which of the following electronic configuration, , of an atom has the lowest ionisation enthalpy?, /2007], , (a) 1s? 2s?2p* (b) 1s? 2s? 2p* 3s!, , (c) 1s? 2s? 2ph (d) 1s? 2s? 2p*, , Identify the correct order of the size of the following:, , (a) Ca?*<K*<Ar<Cl<S* 2007], , (b) Ar<Ca**<K*<CIr<$?, , (c) Ca?*<Ar<K*<Cr<S*>, , (d) Ca**<K*<Ar<S*<Cr, , Which one of the following oxides is expected, , to exhibit paramagnetic behaviour? =‘ /2005/, , (a) CO, (b) SiO,, , (c) SO, (d) ClO,, , Tonic radii are [2004], , (a) inversely proportional to effective nuclear, charge, , (b) inversely proportional to square of, effective nuclear charge, , (c) directly proportional to effective nuclear, charge, , (d) directly proportional to square of effective, nuclear charge, , Among K, Ca, Fe and Zn, the element which can, form more than one binary compound with, , chlorine is [2004], (a) Fe (b) Zn, (c) K (d) Ca, , 29., , 31, , 32., , 33., , , , Which of the following statements is true? (2002), , (a) Silicon exhibits 4 coordination number in, its compound, , (b) Bond energy of F, is less than Cl,, , (c) Mn(II) oxidation state is more stable than, Mn(I1) in aqueous state, , (d) Elements of 15th group shows only +3 and, +5 oxidation states, , Which of the following order is wrong? [2002], , (a) NH, <PH,<AsH, — Acidic, , (b) Li<Be<B<C-—FirstIP, , (c) Al,O, <MgO<Na,O<K,O-Basic, , (d) Lit <Na*<K*<Cs*-—lIonic radius, , Correct order of first IP among following, , elements Be, B,C, N, O is (2001), , (a) B<Be<C<O<N(b) B<Be<C<N<O, , (c) Be<B<C<N<O(d) Be<B<C<O<N, , Of the given electronic configurations for the, , elements, which electronic configuration, , indicates that there will be abnormally high, , difference in the second and third ionization, , energy for the element? [1999], , (a) 19°28? 2p°3s? — (b)_ 1s? 2s? 2p 35!, , (c) 1s?2s? 2p 3s? 3p!(d) 1s? 2s? 2p 3s? 3p?, , The first ionization potentials (eV) of Be and B, , respectively are {[1998], (a) 829,932 (b) 9.32,9.32, (c) 829,829 (d) 932,829, , Which of the following does not represent the, correct order of the properties indicated /1997], (a) Ni?*>Cr** > Fe?* > Mn** (size), , (b) Sc>Ti>Cr>Mn(size), , (c) Mn?*> Ni?*<Co** <Fe** (unpaired electron), (d)_ Fe*>Co**>Ne**> Cu** (unpaired electron), Which one of the following ions will be the, , smallest in size? 1{1996], (a) Na* (b) Mg?*, (©) F (d) O, Among the following oxides, the one which is, , most basic is 11994], (a) ZnO (b) MgO, (c) Al,0, (d)_N,O,, , One of the characteristic properties of nonmetals is that they /1993], (a) Are reducing agents, , (b) Form basic oxides, , (c) Form cations by electron gain, , (d) Are electronegative

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13., , Match the oxide given in column A with its, property given in column B /NEET Odisha, 2019], , Column-A. Column-B, (i) Na,O (A) Neutral, (i) ALO, (B) Basic, (it) NO (C) Acidic, (iv) ChO, (D) Amphoteric, Which of the following options has all correct, pairs?, , (a) (i)4B), (ii)-(D), (ili}-(A), (iv HC), , (b) (4B), (ii)(A), (itt}-(D), (ivHC), , (ce) GHC), (it)(B), (1ii)-(A), (iv HD), , (d) (4A), ()(D), (n)-(B), (iv HC), , For the second period elements the correct, , increasing order of first ionisation enthalpy is, , (a) Li<Be<B<C<N<O<F<Ne /2019], , (b) Li<B<Be<C<O<N<F<Ne, , (co) Li<B<Be<C<N<O<F<Ne, , (d) Li<Be<B<C<O<N<F<Ne, , The correct order of atomic radii in group 13, , elements is P2018], , (a) B<Al<In<Ga<Tl, , (b) B<Al<Ga<In<TI, , (c) B<Ga<Al<In<TI, , (d) B<Ga<Al<TI<In, , In which of the following options the order of, , arrangement does not agree with the variation, , of property indicated against it ? (2016), , (a) Al*<Mg?* <Na* <F> (increasing ionic, size), , (b) B<C<N <O(increasing first ionisation, enthalpy), , (c) 1< Br <F <Cl (increasing electron gain, enthalpy), , (d) Li<Na<K~<Rb( increasing metallic radius), , ‘The species Ar, K* and Ca?* contain the same, , number of electrons. In which order do their radii, , increase ? [2015], , (a) Ca**<Ar<K* (6) Ca?*<K*<Ar, , (ce) K*<Ar<Ca™* () Ar<K*<Ca™, , The formation of the oxide ion O*(g), from, , oxygen atom requires first an exothermic and, then an endothermic step as shown below :, , O(g) + e°> O-(g), AyH?=-141 kJ mot"!, O-(g)+e° + O* (g); ApH? =+780 kJ mol"!, , , , 14,, , 15., , 16,, , 17., , 18,, , 19., , Thus process of formation of O7> in gas phase, , is unfavourable even though O*> is isoelectronic, , with neon. It is due to the fact that /2015 RS/, , (a) Electron repulsion outweighs the stability, gained by achieving noble gas configuration, , (b) O-ion has comparatively smaller size than, oxygen atom, , (c) Oxygen is more electronegative, , (d) Addition of electron in oxygen results in, larger size of the ion., , Which of the following orders of ionic radii is, , correctly represented ? Pog, , (a) H->H*>H (b) Na*> F->02, (c) F°>O*>Na* (d) Alt> Mg?*> N3, Which one of the following arrangements, , represents the correct order of least negative to, , most negative electron gain enthalpy for C, Ca,, , Al, F and 0? |NEET Kar. 2013], , (a) Ca<Al<C<O<F(b) Al<Ca<O<C<F, , (ce) Al<O<C<Ca<F (d) C<F<O<Al<Ca, , Identify the wrong statement in the following:, , 2012], , (a) Amongst isoelectronic species, smaller the, positive charge on the cation, smaller is, the ionic radius., , (b) Amongst isoelectronic species, greater the, negative charge on the anion, larger is the, ionic radius, , (c) Atomic radius of the elements increases as, one moves down the first group of the, periodic table., , (d) Atomic radius of the elements decreases, as one moves across from left to right in, the 2™ period of the periodic table, , What is the value of electron gain enthalpy of, , Na* ifIE, of Na=5,1 eV? POuUM], (a) -SleV (b) -102eV, (c) +255¢V (d) +10.2eV, , Among the elements Ca, Mg, P and Cl, the order, of increasing atomic radii is : [2010], (a) Ca<Mg<P<Cl(b) Mg<Ca<Cl<P, (c) Cl<P<Mg<Ca(d) P<Cl<Ca<Mg, Which of the following represents the correct, order of increasing electron gain enthalpy with, negative sign for the elements O, S, F and Cl?, , (2005, 2010], (a) Cl<F<O<S (b) O<S<F<Cl, (c) F<S<O<Cl (d) S<O<CI<F