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Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. The mass of carbon anode consumed(giving only carbondioxide) in the production of270 kg of aluminium metal from bauxite by theHall process is (Atomic mass: Al = )27 [2005]
2. A5 molar solution of H 2 SO4 is diluted from 1litre to a volume of 10 litres - the normality of thesolution will be: [1991]
3. 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]
4. 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]
5. 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]
6. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
7. Number of moles of MnO4 required tooxidize one mole of ferrous oxalate completelyin acidic medium will be: [2008]
8. The number of moles of KMnO4 that will beneeded to react with one mole of sulphite ion inacidic solution is [2007]
9. 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]
10. The number of significant figures for thethree numbers 161 cm - 0.161 cm - 0.0161 cm are[1998]
11. Percentage of Se in peroxidase anhydraseenzyme is %0.5 by weight (atwt= )78.4 thenminimum molecular weight of peroxidaseanhydrase enzyme is [2001]
12. Boron has two stable isotopes - 10B (19%) and11B (81%)Average atomic weight for boron inthe periodic table is [1990]
13. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
14. An element - Xhas the following isotopiccomposition: 200X: 199 %90X: 202 %8.0X: %2.0 Theweighted average atomic mass of the naturallyoccuring element Xis closest to [2007]
15. How many moles of lead (II) chloride will beformed from a reaction between 6.5 g of PbOand3.2 g of HCl? [2008]
16. The percentage weight of Zn in white vitriol[ZnSO47H2O] is approximately equal to (Zn =65 - S=32 - O=16 and H= )1 [1995]
17. One litre hard water contains 12.00 mg Mg 2+.Mili-equivalents of washing soda required toremove its hardness is: [1988]
18. 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]
19. 6.02 × 1020 molecules of urea are present in 100 mLof its solutionThe concentration ofsolution is: [2013]
20. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
21. At S.T.P the density of CCl 4 vapours in g/Lwillbe nearest to: [1988]
22. An organic compound contains carbon - hydrogen and oxygenIts elemental analysisgave C - %38.71 and H - .%9.67The empiricalformula of the compound would be: [2008]
23. Which has maximum number of molecules?[2003]
24. Volume occupied by one molecule of water(density = 1 g cm-“)3 is: [2008]
25. An organic compound containing C - HandOgave on analysis C-“ %40 and H -“ .%6.66Itsempirical formula would be [1999 - 94]

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