Electrolysis — Chemistry STD 10 — Question

Electrovalent compounds have __________ melting points.

The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is __________.

The electronegativities of atoms giving covalent molecules are generally __________.

Converting ethanol to ethene requires the use of_________(Concentrated hydrochloric acid, concentrated nitric cid, concentrated sulphuric acid).

Electro covalent compounds have a _____ boiling point (low, high)

Hydrogen and chlorine reacts in presence of ___________ to form hydrogen chloride.

Choose the word or phrase from the bracket which correctly complete each of the following statement:
The element below sodium in the same group would be expected to have a ............... (lower/higher) electro-negativity than sodium, and the element above chlorine would be expected to have a ................. (lower/higher) ionisation potential than chlorine.

The physical property of concentrated sulphuric acid that makes it valuable in preparing other acids is its _______ .

In the formation of sodium chloride, the sodium atom loses an electron from its valence shell and hence is ________. (oxidised/reduced).

Hydrogen chloride is collected by the upward displacement of air because its vapour density is ________ as compared to air being 14.4. [36.5/18.5]