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Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. One litre hard water contains 12.00 mg Mg 2+.Mili-equivalents of washing soda required toremove its hardness is: [1988]
2. The number of gram molecules of oxygen in6.02 × 10 24 CO molecules is [1990]
3. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
4. 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]
5. At S.T.P the density of CCl 4 vapours in g/Lwillbe nearest to: [1988]
6. 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]
7. 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]
8. 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]
9. 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]
10. Boron has two stable isotopes - 10B (19%) and11B (81%)Average atomic weight for boron inthe periodic table is [1990]
11. 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]
12. Which has the maximum number ofmolecules among the following? [2011]
13. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
14. Assuming fully decomposed - the volume ofCO2 released at STP on heating 9.85 g of BaCO3(Atomic mass - Ba = )137 will be [2000]
15. An organic compound containing C - HandOgave on analysis C-“ %40 and H -“ .%6.66Itsempirical formula would be [1999 - 94]
16. In an experiment it showed that 10 mLof0.05 Msolution of chloride required 0 mLof 0.1Msolution of AgNO3 - which of the following willbe the formula of the chloride (Xstands for thesymbol of the element other than chlorine):[2013]
17. What is the weight of oxygen required for thecomplete combustion of 2.8 kg of ethylene?[1989]
18. 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]
19. Concentrated aqueous sulphuric acid is %98H2 SO4 by mass and has a density of 1.80 g mL -“ 1.Volume of acid required to make one litre of0.1MH2 SO4 solution is [2007]
20. A5 molar solution of H 2 SO4 is diluted from 1litre to a volume of 10 litres - the normality of thesolution will be: [1991]
21. An organic compound contains carbon - hydrogen and oxygenIts elemental analysisgave C - %38.71 and H - .%9.67The empiricalformula of the compound would be: [2008]
22. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
23. Which has maximum number of molecules?[2003]
24. Number of moles of MnO4 required tooxidize one mole of ferrous oxalate completelyin acidic medium will be: [2008]
25. How many moles of lead (II) chloride will beformed from a reaction between 6.5 g of PbOand3.2 g of HCl? [2008]

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