d and f BLOCK ELEMENTS

Which of the following best describes the overall change in the oxidation state of chromium when dichromate acts as an oxidizing agent in acid solution?

• From +3 to +6
• From +6 to +3
• No change
• From 0 to +3

What is the main product formed when acidified potassium dichromate oxidizes hydrogen sulphide (H2S) according to the text?

• Sulphur dioxide
• Hydrogen
• Sulphur
• Sulphuric acid

In the context of the provided text, what does the term 'volumetric analysis' refer to?

• A method of separating compounds based on density
• A method of quantitative chemical analysis involving measuring volumes of solutions
• A technique for determining the color of solutions
• A method for purifying salts by crystallization

What is the main advantage of using sodium dichromate over potassium dichromate in organic chemistry applications mentioned in the text?

• Its lower cost
• Its greater solubility in water
• Its stronger oxidizing power
• Its non-toxicity

Which of the following is a true statement about the solubility of sodium and potassium dichromates?

• Potassium dichromate is more soluble than sodium dichromate
• They have equal solubility
• Sodium dichromate is more soluble than potassium dichromate
• Solubility depends only on temperature