d and f BLOCK ELEMENTS

What is the balanced chemical equation for the conversion of dichromate ions to chromate ions in basic solution?

• Cr2O7^2- + H2O -> 2 CrO4^2- + 2 H+
• Cr2O7^2- + 2 OH- -> 2 CrO4^2- + H2O
• 2 CrO4^2- + 2 H+ -> Cr2O7^2- + H2O
• Cr2O7^2- + 4 OH- -> 2 CrO4^2- + 2 H2O

Which of the following best describes the relationship between chromate and dichromate ions in aqueous solution?

• They are completely separate and do not interconvert
• They exist in equilibrium, and the position depends on pH
• They only interconvert at high temperatures
• They are isomers of each other

What type of reaction occurs when sodium dichromate solution is treated with potassium chloride to prepare potassium dichromate?

• Redox reaction
• Double displacement (metathesis)
• Acid-base reaction
• Decomposition reaction

What color are the crystals of potassium dichromate that form during its preparation?

• Yellow
• Red
• Orange
• Green

Which of the following is a correct statement regarding the use of potassium dichromate as an oxidizing agent?

• It gets oxidized to CrO4^2- ions during oxidation reactions
• It gets reduced to Cr^3+ ions during oxidation reactions
• It remains unchanged
• It loses oxygen atoms