ASSERTION : The cell potential of mercury cell is 1.35 V which remains constant. REASON : In mercury cell, the electrolyte is a paste of HgO and ZnO.
Correct!
Wrong!
ASSERTION : The transition of electrons n3 → n2 in H atom will emit greater energy than n4 → n3. REASON : n3 and n2 are closer to nucleus than n4.
Correct!
Wrong!
ASSERTION : If more and more solute is added to a solvent, the freezing point of the solution keeps on becoming higher and higher. REASON : Presence of large amount of the solid solute does not allow the solution to freeze.
Correct!
Wrong!
ASSERTION : van der Waals’ equation explains the behaviour of ideal gases. REASON : Ideal gases can only be compressed.
Correct!
Wrong!
ASSERTION : In an electrochemical cell, concentration of the anodic half-cell increases while that of cathodic half-cell decreases when the two electrodes are joined by a wire. REASON : At anodic half-cell metal oxidises to metal ion dissolving the ion in the solution thus, its concentration increases at anode and decreases at cathode due to reduction of metal ions.
Correct!
Wrong!
ASSERTION : Most probable velocity is the velocity possessed by maximum fraction of molecules at the same temperature. REASON : On collision, more and more molecules acquire higher speed at the same temperature.
Correct!
Wrong!
ASSERTION : The molecules on the surface have lesser energy. REASON : During adsorption, the surface of solid is in a state of relaxation.
Correct!
Wrong!
ASSERTION : Enthalpy of formation of O2 molecule at 298 K and 1 atm pressure is zero. REASON : Enthalpy of formation of all the elements at STP is zero.
Correct!
Wrong!
ASSERTION : If the solubility of AgCl in water is 1.5 × 10–10, then its solubility in 0.01M NaCl aqueous solution is 1.5 × 10–8 M. REASON : NaCl dissociates completely so [Cl–] = 0.01 M.
Correct!
Wrong!
ASSERTION : In caesium chloride crystals, Cs+ ions adopt bcc arrangement. REASON : For bcc arrangement, number of tetrahedral sites is double the number of atoms in the packing.
Correct!
Wrong!
