1
IIT-JEE 1983
Subjective
+4
-0
4.08 g of a mixture of BaO and an unknown carbonate MCO3 was heated strongly. The residue weighed 3.64 g. This was dissolved in 100 ml of 1 N HCl. The excess acid required 16 ml of 2.5 N NaOH solution for complete neutralization. Identify the metal M. (At wt. H = 1, C = 12, O = 16, Cl = 35.5, Ba = 138)
2
IIT-JEE 1983
Subjective
+1
-0
Complete and balance the following equation:

$$Cr_2O_7^{2-}$$ + C2H4O $$\to$$ C2H4O2 + Cr3+
3
IIT-JEE 1983
Subjective
+1
-0
Complete and balance the following equation:

Ce3+ + $$S_2O_8^{-2} \to $$ $$SO_4^{-2}$$ + Ce4+
4
IIT-JEE 1983
Subjective
+5
-0
The density of a 3 M Sodium thiosulphate solution (Na2S2O3) is 1.25 g per ml. Calculate

(i) the percentage by weight of sodium thiosulphate,

(ii) the mole fraction of sodium thiosulphate and

(iii) the molalities of Na+ and $$S_2O_3^{-2}$$ ions
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