Q2. Which lanthanoid commonly exhibits both +2 and +3 oxidation states due to extra stability of half-filled f-orbitals?A. EuB. CeC. GdD. Lu
Q4. Which of the following is NOT a characteristic property of transition elements?A. Formation of colored ionsB. Variable oxidation statesC. Low melting pointsD. Catalytic activity
Q5. What is the product when K 2 Cr 2 O 7 reacts with KI in acidic medium?A. CrO 4 2- and I 2B. Cr 3+ and I 2C. Cr 2+ and I -D. CrO 2 and IO 3 -
Q8. Which of the following is NOT a use of transition metal compounds?A. CatalystsB. PigmentsC. Food preservativesD. Alloy formation
Q9. Which of the following ions has the highest magnetic moment?A. Fe 2+ (3d 6 )B. Ni 2+ (3d 8 )C. Mn 2+ (3d 5 )D. Co 2+ (3d 7 )
Q10. Which of the following is NOT a property of transition metals?A. Variable oxidation statesB. Formation of colored ionsC. Low melting pointsD. Catalytic activity