State the type of bonding present in it. Answer: (i) Y will form an anion (ii) Z forms a cation (iii) X has four electrons in its valence shell. (ii) High electron affinity: Higher the value of electron affinity, greater will be the tendency of the atom to gain electron and form an anion. Question 3: Explain how polar covalent compound HCl which is a bad conductor in pure and liquid state, ionises in water. Question 5: Why is hydrogen ion called proton? However, if you experience any difficulties, follow the following steps: 1.) Answer: For the formation of a co-ordinate bond the atom acting as a donor must have one unused pair of electrons which may be donated by it to the acceptor atom. Explore the causes, effects, and solutions to ozone layer depletion only at BYJU'S. Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. Hence it is also called a semipolar bond or dotive bond. Answer: Question 9: (i) Give one property of hydrogen chloride which agrees with it being a covalent compound. In the second step the two electrons, one each with A and B- are shared by both the ions. The acceptor atom must have an empty orbital to accept the lone pair of electrons. Visit official Website CISCE for detail information about ICSE Board Class-10. (b) A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair. Further, since the number of protons remains the same as in the neutral atom, the nucleus attracts the increased number of electrons less strongly. Answer: The important general characteristics of covalent compounds are as follows: (i) Usually covalent compounds exist in gaseous, liquid or amorphous state. Thus their melting and boiling points are higher than covalent compounds and lower than ionic compounds. It donates its valence electron, the residual ion consists of a single proton. 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