Consider the following pairs: How many of the pairs given above are correctly matched?Chemical Reaction Type of Chemical Reaction I. Fe(s) + CuSO4(aq.) → FeSO4(aq.) + Cu(s) Displacement reaction II. Na2SO4(aq.) + BaCl2(aq.) → BaSO4(s) + 2NaCl(aq.) Double displacement reaction III. Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) Redox reaction IV. 2KClO3(s) → 2KCl(s) + 3O2(g) Thermal decomposition reaction
All four
Pair I is correctly matched: iron, being more reactive than copper, displaces it from copper sulphate solution, a classic displacement reaction. Pair II is correctly matched: sodium sulphate and barium chloride exchange ions to precipitate insoluble barium sulphate, a double displacement (precipitation) reaction. Pair III is correctly matched: iron goes from the +3 to the 0 oxidation state (reduction) while carbon goes from +2 to +4 (oxidation), so this reduction of iron(III) oxide by carbon monoxide is indeed a redox reaction. Pair IV is correctly matched: potassium chlorate breaks down into potassium chloride and oxygen gas on heating, a thermal decomposition reaction. Hence, all four pairs are correctly matched.
Similar Questions
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Oxygen gas is easily produced at a faster rate by heating a mixture of Potassium Chlorate and Manganese dioxide than heating Potassium chlorate alone.
Statement II: Manganese dioxide acts as a negative catalyst.
Which one of the following is a chemical change?
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: The granules of modern gunpowder (also called black powder) are typically coated with Graphite.
Statement II: Graphite prevents the build-up of electrostatic charge.
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Colour of Nitrogen dioxide changes to colourless at low temperature.
Statement II: At low temperature Nitrogen tetroxide (N 2O 4) is formed which is colourless.
- Which one of the following is not an example of a redox reaction?
- Which one of the following is not a pigment?
- Which one of the following reactions is an example of decomposition reaction?
Which among the following is the correct arrangement of halogens in the increasing order of their oxidizing nature?
An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?
Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour?
Important Questions from Chemical Reaction
Which of the following statement is/are true?
I. In physical change new substance is formed. substance is formed.
II. In chemical change no new substance is formed.
Which of the following cells involves similar chemical reactions?
The information not obtained from balanced chemical equation is
Oxygen cannot be obtained by which one of the following methods?
Which is the most reactive metal?
