Which one of the following processes involve chemical reactions?
(a) Storing of oxygen gas under pressure in a gas cylinder
(b) Liquefaction of air
(c) Keeping petrol in a china dish in the open(d) Heating copper wire in presence of air at high temperature
Correct Answer: (d) Heating copper wire in presence of air at high temperature
Explanation: In first three options given above, a chemical reaction does not take place as no new product is formed. When copper is heated in the presence of air at high-temperature copper undergoes oxidation reaction to give out copper oxide.
Related Articles
- How does applying pressure (or compression) help in the liquefaction of a gas?
- What is the source of oxygen gas in air?
- Write complete balanced equations for the following reactions:(a) Calcium (solid) + Water (liquid) ------> Calcium hydroxide (solution) + Hydrogen (gas)(b) Sulphur dioxide (gas) + Oxygen (gas) ------> Sulphur trioxide (gas)
- Calculate(a) the mass of one atom of oxygen(b) the mass of one molecule of oxygen(c) the mass of one mole of oxygen gas(d) the mass of one ion of oxygen(e) the number of atoms in 1 mole of oxygen molecule
- State one use each of the following products of petroleum:(a) petroleum gas,(b) petrol,(c) Diesel,(d) Lubricating oil,(e) Bitumen
- Which of the following is not a mixture?(a) kerosene (b) air(c) alcohol (d) petrol
- In one of the industrial processes used for the manufacture of sodium hydroxide, a gas X is formed as a by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in the chemical industry. Identify X and Y, giving the chemical equation of the reactions involved.
- Name the major gas present in the (a) inhaled air(b) exhaled air.
- The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change - A) then it burns (Change - B). The following statements pertain to these changes. Choose the correct one.(i) Process - A is a chemical change.(ii) Process - B is a chemical change.(iii) Both processes A and B are chemical changes.(iv) None of these processes is a chemical change.2. Anaerobic bacteria digest animal waste and produce biogas (Change - A). The biogas is then burnt as fuel (Change - B). The following statements pertain to these changes. Choose the correct one.(i) Process - A is a chemical change.(ii) Process - B is a chemical change.
- Which of the following cannot transmit sound? Water, Vacuum, Aluminium, Oxygen gas
- 2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.
- Which of the following represent the suitable conditions for the liquefaction of gases?(a) low temperature, low pressure (b) high temperature, low pressure(c) low temperature, high pressure (d) high temperature, high pressure
- Air is a mixture of various gases. One of the gas is 21% part of the air and is essential for the survival of human beings. This gas isnitrogenoxygenozoneargon
- On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed(a) Write a balanced chemical equation of the reaction.(b) Identity the brown gas X evolved.(c) Identify the type of reaction.(d) What could be the pH range of aqueous solution of the gas X?
- What is the name of the process in which :(a) a solid turns directly into a gas?(b) a gas turns directly into a solid?
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