d and f BLOCK ELEMENTS

What is one of the uses of sodium dichromate mentioned in the text?

• As a food preservative
• As a primary standard
• As an oxidizing agent in organic chemistry
• As a reducing agent

Which of the following is a strong oxidizing agent mentioned in the text?

• Only sodium dichromate
• Only potassium dichromate
• Both sodium and potassium dichromates
• Neither is a strong oxidizing agent

What type of chemical reaction occurs when manganate(VI) ion (MnO4^2-) converts to permanganate (MnO4^-) and manganese dioxide (MnO2) in a neutral or acidic solution?

• Combination
• Decomposition
• Disproportionation
• Neutralization

What color is associated with the K2MnO4 formed during the preparation of KMnO4?

• Purple
• Dark green
• Orange
• Yellow

What is the immediate product formed when MnO2 is fused with an alkali metal hydroxide and an oxidizing agent like KNO3?

• KMnO4 (Permanganate)
• MnO
• K2MnO4 (Manganate)
• Mn2O3