Ionic compounds like sodium chloride generally
A{'text': 'Have low melting and boiling points and low densities', 'label': 'A'}
B{'text': 'Do not conduct electricity in solid, molten or aqueous state', 'label': 'B'}
C{'text': 'Exist as covalent gases at ordinary laboratory conditions', 'label': 'C'}
D{'text': 'Have high melting/boiling points and conduct in molten/aqueous state', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Have high melting/boiling points and conduct in molten/aqueous state', 'label': 'D'}
1. Ionic compounds are held together by strong electrostatic forces between oppositely charged ions.
2. Melting/boiling points are high because of these strong forces.
3. In solid state, ions are locked in the lattice and cannot conduct electricity.
4. In molten or aqueous solution, ions are free to move, so they conduct electricity.
_Source: NCERT Class 10 Science, Ch 3 "Metals and Non-metals", §3.2.2_
Related questions
What are the elements that fit neither the metals nor the non-metals called?Where on the periodic table are most of the metals found?Galvanisation protects iron and steel from rusting by coating them with a thin layer ofWhy do ionic compounds such as NaCl conduct electricity in the molten state but not when sAn element reacts with oxygen to give an oxide with a high melting point that is also soluFood cans are coated with tin rather than zinc becauseBrass is an alloy ofIn the experiment on rusting, iron nails rust only in the test tube where the nails are ex