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Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
2. Which has the maximum number ofmolecules among the following? [2011]
3. One litre hard water contains 12.00 mg Mg 2+.Mili-equivalents of washing soda required toremove its hardness is: [1988]
4. Which has maximum number of molecules?[2003]
5. How many moles of lead (II) chloride will beformed from a reaction between 6.5 g of PbOand3.2 g of HCl? [2008]
6. 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]
7. The number of moles of KMnO4 that will beneeded to react with one mole of sulphite ion inacidic solution is [2007]
8. The number of moles of KMnO4 reduced byone mole of KIin alkaline medium is: [2005]
9. An organic compound containing C - HandOgave on analysis C-“ %40 and H -“ .%6.66Itsempirical formula would be [1999 - 94]
10. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
11. Percentage of Se in peroxidase anhydraseenzyme is %0.5 by weight (atwt= )78.4 thenminimum molecular weight of peroxidaseanhydrase enzyme is [2001]
12. The number of significant figures for thethree numbers 161 cm - 0.161 cm - 0.0161 cm are[1998]
13. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
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. 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]
16. 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]
17. An organic compound contains carbon - hydrogen and oxygenIts elemental analysisgave C - %38.71 and H - .%9.67The empiricalformula of the compound would be: [2008]
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. Number of moles of MnO4 required tooxidize one mole of ferrous oxalate completelyin acidic medium will be: [2008]
20. 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]
21. Assuming fully decomposed - the volume ofCO2 released at STP on heating 9.85 g of BaCO3(Atomic mass - Ba = )137 will be [2000]
22. 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]
23. 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]
24. 6.02 × 1020 molecules of urea are present in 100 mLof its solutionThe concentration ofsolution is: [2013]
25. 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]

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