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1.
On addition of cone. H?SO? to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet flames come out. This is because
2.
Which of the following pairs of ions are isoelectronic and isostructural?
3.
Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
4.
5.
Hot cone. H?SO? acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by cone. H?SO? into two gaseous products?
6.
H?S is more acidic than H2O because
7.
The boiling points of hydrides of group 16 are in the order
8.
In the manufacture of sulphuric acid by contact process Tyndall box is used to
9.
Fluorine differs from rest of the halogens in some of its properties. This is due to
10.
The set with correct order of acidity is