Q1. Which of the following is NOT a use of lanthanoids?A. Alloy steelsB. Petroleum cracking catalystsC. Structural building materialD. TV screen phosphors
Q2. Which of the following is NOT a use of potassium dichromate?A. Oxidizing agent in organic chemistryB. Primary standard in volumetric analysisC. Reducing agent in metallurgyD. Leather tanning
Q3. What is the primary reason for the variable oxidation states in transition elements?A. Small atomic sizeB. High ionization energyC. Comparable energies of (n-1)d and ns orbitalsD. Presence of f-electrons
Q4. What is the product when K 2 Cr 2 O 7 reacts with H 2 S in acidic medium?A. CrO 4 2– + SO 2B. Cr 2+ + H 2 SO 4C. CrO 2 + H 2 OD. Cr 3+ + S
Q5. Which of the following is NOT a characteristic of lanthanoids?A. Silvery-white appearanceB. High volatilityC. +3 oxidation stateD. Formation of colored ions
Q6. Which of the following represents the reaction of K 2 Cr 2 O 7 with FeSO 4 in acidic medium?A. Oxidation of Fe 2+ to Fe 3+B. Reduction of Fe 3+ to Fe 2+C. Formation of FeCr 2 O 4D. No reaction occurs
Q7. Which of the following is a consequence of lanthanoid contraction?A. Increase in atomic radii across the seriesB. Decrease in density of lanthanoidsC. Similar sizes of Zr and HfD. Increase in ionization energy
Q8. Which of the following correctly represents the reduction half-reaction of dichromate ion in acidic medium?A. Cr 2 O 7 2− + 14H + + 6e − → 2Cr 3+ + 7H 2 OB. Cr 2 O 7 2− → CrO 4 2−C. Cr 2 O 7 2− → Cr 2+D. Cr 2 O 7 2− → CrO 2
Q9. Which of the following is NOT a use of potassium permanganate?A. Oxidizing agent in organic chemistryB. DisinfectantC. Reducing agent in metallurgyD. Bleaching agent
Q10. Which of the following transition metal ions has the electronic configuration [Ar] 3d 8 ?A. Fe 2+B. Co 2+C. Ni 2+D. Cu 2+