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Chemistry Test ...

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  • Question 1
    1 / -0

    A sample of calamine ore (ZnCO3) contains clay as an impurity which is 37.5%. Clay impurity loses some amount of its weight as moisture on prolonged heating. If the total loss in weight of ore on heating (due to CO2 and H2O) is 28%, then find the percentage loss in the weight of the clay. (Given atomic masses: Zn=65,C=12,O=16).

  • Question 2
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    2.76 g of silver carbonate on being strongly heated yields a residue weighing:

  • Question 3
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    We have two solutions, one is 1 L of 0.1 M NaCl and the other is 2 L of 0.2 M CaCl2. Using only these two solutions, what maximum volume of a solution can be prepared, which has [Cl−]=0.34M? 

    Given: Both electrolytes are strong.

  • Question 4
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    There are two oxides of sulphur. They contain 50 % and 60% of oxygen, respectively, by weights. The ratio of weights of sulphur, which combines with 1 g of oxygen, is:

  • Question 5
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    In the reaction:
    \(N a_{2} S_{2} O_{3}+4 C l_{2}+5 H_{2} O \rightarrow N a_{2} S O_{4}+8 H C l,\) the equivalent weight of \(N a_{2} S_{2} O_{3}\) will be \(\left( M =\right.\) molecular weight of \(\left. Na _{2} S _{2} O _{3}\right)\) :

  • Question 6
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    Calcium carbonate \((10 g )\) reacts with aqueous \(HCl (0.3 mol )\) according to the reaction,
    \[C a C O_{3}(s)+2 H C l(a q) \rightarrow C a C l_{2}(a q)+C O_{2}(g)+H_{2} O(l)
    \]The number of moles of \(CaCl _{2}\) formed in the reaction is:

  • Question 7
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    Find the mass of pure hydrogen chloride gas dissolved per litre of its solution if the normality of the solution is 0.15N. [At. Wt. : H=1,Cl=35.5]

  • Question 8
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    45.4 L of dinitrogen reacted with 22.7L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:

    2N2(g)+O2(g)→2N2O(g)

    Which law is being obeyed in this experiment?

  • Question 9
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    Sulphuric acid is produced when sulphur dioxide reacts with oxygen and water in the presence of a catalyst according to the reaction:
    \(2 S O_{2}(g)+O_{2}(g)+2 H_{2} O(l) \longrightarrow 2 H_{2} S O_{4} \cdot\)
    If 5.6mol of \(S O_{2}\) reacts with 4.8 mol of \(O_{2}\) and an excess of water, what is the maximum number of moles of \(H_{2} S O_{4}\) that can be obtained?

  • Question 10
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    The mass percent of calcium, phosphorus and oxygen in calcium phosphate, Ca3(PO4)2 is :

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