d and f BLOCK ELEMENTS

Which of the following best describes the reaction used to prepare potassium dichromate from sodium dichromate?

• Heating
• Treatment with potassium chloride
• Electrolysis
• Reduction with hydrogen

What factor determines whether chromate or dichromate ions are predominant in an aqueous solution?

• Temperature
• Concentration of the salt
• pH of the solution
• Presence of other ions

What is the approximate Cr–O–Cr bond angle in the dichromate ion?

• 109.5°
• 120°
• 126°
• 180°

Which ion has a tetrahedral structure according to the provided text?

• Dichromate ion (Cr2O7^2-)
• Chromate ion (CrO4^2-)
• Both chromate and dichromate ions
• Neither chromate nor dichromate ions

What is the color of the crystals formed when potassium dichromate is prepared from sodium dichromate and potassium chloride?

• Red
• Orange
• Yellow
• Green