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In a hydrocarbon, mass ratio of hydrogen and carbon is 1:3  the empirical formula of hydrocarbon is 

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Important Questions on Some Basic Concepts of Chemistry

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KMnO4 reacts with oxalic acid according to the equation

2MnO4-+5C2O42-+16H+2Mn2++10CO2+8H2O Here, 20 mL of 0.1 M KMnO4 is equivalent to
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The mass of potassium dichromate crystals required to oxidise 750 cm3 of 0.6 M Mohr's salt solution is (Given, molar mass : Potassium dichromate = 294, Mohr's salt = 392)
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The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight =78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
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The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is:
(Atomic mass: Al=27)
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An element X has the following isotopic composition:

X200: 90%X199: 8.0%X202: 2.0%

The weighted average atomic mass of the naturally occurring element X is closest to

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How many moles of Lead (II) Chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl

Given the atomic mass of Pb=207.2

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An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave C=38.71% and H2=9.67 %. The empirical formula of the compound would be:
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What volume of oxygen gas O2 measured at 0°C and 1 atm is needed to burn completely 1 L of  propane gas C3H8 measured under the same conditions?