Question

Find the odd one out. Give scientific reasons for your answer.
1. Sodium, potassium, calcium, iron
2. Lightest element, poisonous, tasteless, colourless
3. Magnesium, sodium, silver, hydrogen
4. Oxidising agent, reducing agent hydrogenation, redox​

Answer 1

Answer:

In deserts, most of the houses are Kutcha houses as Kutcha houses are cooler as compared to Pucca Houses. Secondly, deserts have less rainfall so there is less chance of falling of these houses. Thus, due to climate and materials available there, Kutcha houses are common there.

Answer 2

Explanation:

1) Iron

• Sodium, Potassium, and calcium are soft metals while Iron is a hard metal.                                                              

2) Lightest element

• Others are qualitative properties of elements and the lightest element means it is small in size that is quantitative property.

3) Hydrogen

• Magnesium, Sodium, and Silver are metals. Hydrogen is a non-metal.    

4) Hydrogenation

• Other options are part of the redox reaction except for hydrogenation.