With reference to a molecule of water, fill in the blanks with the correct word. [at. no. of H = 1, O = 8]

Water is a …………… [non-polar/polar] covalent molecule in which the atom of …………… [hydrogen/oxygen] attracts electrons more strongly towards itself. The water molecule shows the presence of …………… [double / one single / two single] covalent bond/s and …………… [one/two] lone pair of electrons present in the …………… [hydrogen/oxygen] atom.

Complete the table given below:

Fill in the blanks with the correct word from the brackets:

1. The bond between two elements in group 17[VIIA] of the periodic table is likely to be …………… [ionic/covalent].
2. In the reaction of Cl₂ + 2KI ⟶ 2KCl + I₂ the conversion of 2I to I₂ is deemed as …………… [oxidation/reduction].
3. The covalent molecule containing three single covalent bonds is …………… [water/methane/ammonia].
4. The molecule of water combines with a …………… [hydrogen atom/proton/hydrogen molecule] to form a hydronium ion.
5. For formation of an electrovalent bond between elements 'X' and 'Y' which are a metal and non-metal respectively, X should have a …………… [high/low] ionization potential and 'Y' a …………… [high/low] electron affinity.

A compound has a formula = 'H₂Y'. Y denotes a non-­metal. State the following:

1. The electronic configuration of Y.
2. The valency of Y.
3. The bonding present in 'H₂Y'
4. The bonding present in the compound formed between potassium ($^{39}_{19}\text{K}$) and 'Y'
5. The formula of the compound formed between calcium ($^{40}_{20}\text{Ca}$) and Y.