d and f BLOCK ELEMENTS

What is the color change observed when a solution containing chromate ions is made more acidic?

• Orange to yellow
• Yellow to orange
• No color change
• Colorless to yellow

What is the color change observed when a solution containing dichromate ions is made more basic?

• Yellow to orange
• Orange to yellow
• No color change
• Colorless to orange

What is the main product formed when acidified potassium dichromate oxidizes iron(II) salts according to the text?

• Iron(II) salts
• Oxygen gas
• Iron(III) salts
• Hydrogen gas

What is the main product formed when acidified potassium dichromate oxidizes hydrogen sulphide according to the text?

• Sulphur dioxide
• Hydrogen
• Sulphur
• Sulphuric acid

What is the main product formed when acidified potassium dichromate oxidizes iodide ions according to the text?

• Iodide ions
• Iodate ions
• Iodine
• Hypoiodous acid