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440 questions found
A metal (M) forms thiosulphate with molecular formula M₂S₂O₃. The valency of metal is:
1
2
3
4
The pH of 10⁻⁸ M aqueous solution of HCl is:
less than 7
7
8
more than 8
A catalyst accelerates the reaction because:
it brings reactants closer
it lowers the activation energy
it increases the activation energy
it forms complex with the reaction
What is the concentration of nitrate ions if equal volume of 1 M NaNO₃ and 1 M KCl are mixed?
0.25 M
0.5 M
1 M
2 M
Tailing of mercury is due to the formation of:
HgO
Hg₂O
HgO₂
Hg₂O₂
Bell metal is an alloy of:
Cu, Pb and Sn
Sn and Cu
Zn and Pb
Zn, Cu and Sn
What is meant by electrochemical cell?
Represent an electrochemical cell using above electrodes.
Why is rate law an experimental parameter?
Write down complete cell reactions.
Calculate the emf of the cell.
Define Hess's law of constant heat summation.
What is meant by enthalpy of reaction?
Standard enthalpy of formation of H₂O₂(l) and H₂O(l) are −188 kJ/mol and −286 kJ/mol respectively. What will be the enthalpy change of the following reaction?
2H₂O₂(l) → 2H₂O(l) + O₂(g)
Define ionic product of water.
Write chemical reaction for the conversion of cane-sugar into ethyl alcohol.
Calculate the [OH⁻] concentration of 0.01 M HCl at 25°C.
What is the effect of temperature on ionic product of water?
Deduce the relation:
Define fermentation.