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Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. Which has the maximum number ofmolecules among the following? [2011]
2. The molecular weight of O2 and SO2 are 32and 64 respectivelyAt 15°Cand 150 mm Hgpressure - one litre of O2 contains -˜N-™ molecules.The number of molecules in two litres of SO 2under the same conditions of temperature andpressure will be: [1990]
3. litres nitrogen - 1520 litres nitrogen - 2025 litres nitrogen - 1510 litres nitrogen - 3027The maximum number of molecules ispresent in [2004]
4. Haemoglobin contains %0.334 of iron byweightThe molecular weight of haemoglobin isapproximately 67200The number of ironatoms (atwtof Fe is )56 present in onemolecule of haemoglobin are [1998]
5. Ametal oxide has the formula Z 2O3It can bereduced by hydrogen to give free metal andwater0.1596 g of the metal oxide requires 6 mgof hydrogen for complete reductionThe atomicweight of the metal is [1989]
6. Specific volume of cylindrical virus particleis 6.02 × 10-“2 cc/gmwhose radius and length 7Ã…& 10 A respectivelyIf NA= 6.02 × 1023 - findmolecular weight of virus [2001]
7. How many moles of lead (II) chloride will beformed from a reaction between 6.5 g of PbOand3.2 g of HCl? [2008]
8. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
9. What volume of oxygen gas (O2) measuredat °0 C and 1 atm - is needed to burn completely1L of propane gas (C 3H8) measured under thesame conditions? [2008]
10. What is the weight of oxygen required for thecomplete combustion of 2.8 kg of ethylene?[1989]
11. An organic compound containing C - HandOgave on analysis C-“ %40 and H -“ .%6.66Itsempirical formula would be [1999 - 94]
12. 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be: [2009]
13. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
14. An organic compound contains carbon - hydrogen and oxygenIts elemental analysisgave C - %38.71 and H - .%9.67The empiricalformula of the compound would be: [2008]
15. Ratio of Cp and CV of a gas -˜X-™ is 1.4Thenumber of atoms of the gas -˜X-™ present in 11.2litres of it at NTPwill be [1989]
16. A5 molar solution of H 2 SO4 is diluted from 1litre to a volume of 10 litres - the normality of thesolution will be: [1991]
17. The number of significant figures for thethree numbers 161 cm - 0.161 cm - 0.0161 cm are[1998]
18. The percentage weight of Zn in white vitriol[ZnSO47H2O] is approximately equal to (Zn =65 - S=32 - O=16 and H= )1 [1995]
19. At S.T.P the density of CCl 4 vapours in g/Lwillbe nearest to: [1988]
20. What is the [OH -“ ] in the final solutionprepared by mixing 20.0 mLof 0.050 MHCl with30.0 mLof 0.10 MBa(OH) 2? [2009]
21. Which has maximum number of molecules?[2003]
22. 6.02 × 1020 molecules of urea are present in 100 mLof its solutionThe concentration ofsolution is: [2013]
23. In Haber process 30 litres of dihydrogenand 30 litres of dinitrogen were taken forreaction which yielded only %50 of the expectedproductWhat will be the composition ofgaseous mixture under the aforesaid conditionin the end? [2004]
24. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
25. The number of moles of KMnO4 that will beneeded to react with one mole of sulphite ion inacidic solution is [2007]

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