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In which case is number of molecules of water maximum?

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Important Questions on Some Basic Concepts of Chemistry

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IMPORTANT
2 g mixture of two divalent metals A (at wt=30 amu) and B (at wt=15 amu), on reacting with dilute HCl solution, gives 2.24 L H2 gas at NTP, then composition of A is (in g):
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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:
HARD
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In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at 300 K=15 mm )
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The heat of combustion of carbon to CO2 is -393.5 KJ mole-1. The heat released upon formation of 35.2 g CO2 from carbon and oxygen gas is _________.
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Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer (Atomic masses:O=16, Cu=63 and N=14)
I. 1 molecule of oxygen.
II. 1 atom of nitrogen.
III. 1×10-10 g molecular weight of oxygen.
IV. 1×10-10 g atomic weight of copper.
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How many moles of magnesium phosphate, MgPO42 will contain 0.25 mole of oxygen atoms?