Which of the following preparation of salt is incorrect? * Acid + alkali
Acid + hydrogen
Acid + carbonate
Acid + metal oxide

acid + hydrogen

Explanation:

gives a good combination

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance