Which pair of elements, when combined together, do not form covalent compound.

Answer Below!!

Explanation:

A covalent bond is formed by the sharing of electrons by two non - metals.The elements that is unlikely for form covalent bond are K and Ar.

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d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.