Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group.
Reason (R): In a group, the atomic radii generally increase from top to bottom.
Codes
Reason (R): In a group, the atomic radii generally increase from top to bottom.
Important Questions on Chemistry
Reason (R): Oxides of carbon are emitted when coal burns.
Consider the following statements
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is
1. to keep the washing powder dry.
2. to maintain the alkalinity of the powder.
Which of these statements is/are correct?
1. Baking soda is used in fire extinguishers.
2. Quicklime is used in the manufacture of glass.
3. Gypsum is used in the manufacture of plaster of Paris.
Which of the statements given above is/are correct?
Match List I (fuel gases) with List II (major constituents) and select the correct answer using the codes given below the lists.
| List I | List II |
|
A. CNG |
1. Carbon monoxide, hydrogen |
Codes:
A B C D
Consider the following statements
1. Liquefied Natural Gas (LNG) is liquefied under extremely cold temperatures and high pressure to facilitate storage or transportation in specially designed vessels.
2. First LNG terminal in India was built in Hassan.
3. Natural Gas Liquids (NGL) are separated from LPG and these include ethane, propane, butane and natural gasoline.
Which of the statements given above is/are correct?
