An element E is burned in air. A white solid oxide is formed.
The oxide is tested with damp red litmus paper. The paper turns blue
What is element E?

Option A is correct.

Element E is Calcium.

Explanation:

On combustion in air, element E forms a solid, white oxide which turns red litmus paper blue.

Turning a damp red litmus paper blue, shows that the oxide of element E is basic as only basic/alkaline substances turn red litmus paper blue.

Only metals, group I and group II metals form basic/alkaline oxides.

Amongst the options provided, only Calcium is a metal, and it is a well known group II metal too at that, hence, it is the correct option

Hope this Helps!!!

the answer is a. co2, this would be colder than the : )

explanation:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."