The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:(a) potassium dichromate solution and sulphur dioxide(b) potassium permanganate solution and sulphur dioxide(c) potassium permanganate solution and lemon juice(d) potassium dichromate solution and carbon dioxide
Correct Answer: (a) potassium dichromate solution and sulphur dioxide.
Explanation: The orange colour of potassium dichromate solution changes to green on passing sulphur dioxide.
Related Articles
- When sulphur dioxide gas is passed through acidified potassium dichromate solution, the colour of the solution changes from :(1)orange to yellow(2)orange to green(3) green to orange(4)yellow to green
- You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of:(a) potassium chloride (b) potassium nitride (c) potassium sulphide (d) potassium iodide
- Potassium Permanganate KMnO_4
- How the colour changes when the gases after thermal decomposition of ferrous sulphate come in contact with an acidified solution of potassium dichromate?(a) Green to orange(b) Red to colorless(c) Orange to green(d) Blue to green.
- What happens when we add potassium permanganate and water?
- An acid which can decolourise purple coloured potassium permanganate solution is:(a) sulphuric acid (b) citric acid (c) carbonic acid (d) hydrochloric acid
- The most poisonous product formed by incomplete combustion of fossil fuels is(a) Carbon dioxide (b) Nitrogen dioxide(c) Carbon monoxide (d) Sulphur dioxide
- 3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.(I) How is 5% solution of KMn04 prepared?(ii) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?(iii) Write chemical equation of this reaction.
- (a)What happens when ethanol is oxidised with alkaline potassium permanganate (or acidified potassium dichromate)? Write the equation of the reaction involved.(b) Choose those compounds from the following which can turn blue litmus solution red: HCHO, CH3COOH, CH3OH, C2H5OH, HCOOH, CH3CHO Give reasons for your choice.
- When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
- A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of chemical reaction?/p>
- Give reasons for the following:(a) Sodium and potassium are stored in kerosene.(b) Copper cannot displace zinc from its salt solution (zinc sulphate solution).
- (a) Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.(b) Rewrite the following information in the form of a balanced chemical equation:Magnesium burns in carbon dioxide to form magnesium oxide and carbon.
- Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.(a) Thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.
- Lead nitrate solution is added to a test tube containing potassium iodide solution.(a) Write the name and colour of the compound precipitated.(b) Write the balanced chemical equation for the reaction involved.(c) Name the type of this reaction justifying your answer.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies