Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. 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]
2. 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]
3. 6.02 × 1020 molecules of urea are present in 100 mLof its solutionThe concentration ofsolution is: [2013]
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. litres nitrogen - 1520 litres nitrogen - 2025 litres nitrogen - 1510 litres nitrogen - 3027The maximum number of molecules ispresent in [2004]
6. 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]
7. Boron has two stable isotopes - 10B (19%) and11B (81%)Average atomic weight for boron inthe periodic table is [1990]
8. Assuming fully decomposed - the volume ofCO2 released at STP on heating 9.85 g of BaCO3(Atomic mass - Ba = )137 will be [2000]
9. One litre hard water contains 12.00 mg Mg 2+.Mili-equivalents of washing soda required toremove its hardness is: [1988]
10. Number of moles of MnO4 required tooxidize one mole of ferrous oxalate completelyin acidic medium will be: [2008]
11. 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]
12. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
13. What is the weight of oxygen required for thecomplete combustion of 2.8 kg of ethylene?[1989]
14. 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]
15. Which has maximum number of molecules?[2003]
16. The number of significant figures for thethree numbers 161 cm - 0.161 cm - 0.0161 cm are[1998]
17. Which has the maximum number ofmolecules among the following? [2011]
18. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
19. 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]
20. 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]
21. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
22. 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]
23. An organic compound contains carbon - hydrogen and oxygenIts elemental analysisgave C - %38.71 and H - .%9.67The empiricalformula of the compound would be: [2008]
24. How many moles of lead (II) chloride will beformed from a reaction between 6.5 g of PbOand3.2 g of HCl? [2008]
25. 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]

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