Practice Test 12
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3 g of Mg is burnt in a closed vessel containing 3 g of oxygen.The weight of excess reactant left is

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How many gram of sulphur can be obtained by the reaction of 1 mol of SO2 with 22.4 L of H2S at STP?

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Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be

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The percentage of P2O5 in diammonium hydrogen phosphate (NH4)2HPO4 is

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100 ml O2 and H2 kept at same temperature and pressure.What is true about their number of molecules

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    This is Avogadro’s hypothesis.According to this, equal volume of all gases contain equal no. of molecules under similar condition of temperature and pressure.

How many moles of KI are required to produce 0.4 moles of K2HgI4 ?

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    2KI + HgI2 ⟶ K2HgI4
    Moles of KI required to produce 0.4 moles of K2HgI4= 2 × 0.4 = 0.8

Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCl2 is

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    The atomic weight of sulphur =32
    In SCl2 valency of sulphur = 2
    So equivalent mass of sulphur = \(\frac{32}{2}\) = 16

The unit J Pa–1 is equivalent to

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    Joule is the unit of work and Pascal is unit of pressure.

    JPa-1=\(\frac{J}{Pa}\) = \(\frac{Work}{Pressure}\)
    = \(\frac{Nm}{Nm^{-2}}\) = m3

The number of atoms of Cr and O are 4.8 × 1010 and 9.6 × 1010 respectively. Its empirical formula is

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    Ratio of atoms of Cr and O= 4.8 × 1010: 9.6 ×1010= 1: 2
    Hence, empirical formula = CrO2

What volume of hydrogen gas,at 273 K and 1 atm. pressure will be consumed in obtaining 21.6 g of elemental boron(atomic mass = 10.8) from the reduction of boron trichloride by hydrogen ?

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Some Basic Concepts of Chemistry
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