Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

There is absence of atmosphere on the moon,so no part of heat remains trapped in its atmosphere. That is why in day time moon gets hot and in night it cools...

The given properties are the properties of a covalent or network solid. Therefore, the given solid is a covalent or network solid. Examples of such solids include diamond (C) and...

In ionic compounds, electricity is conducted by ions. In solid state, ions are held together by strong electrostatic forces and are not free to move about within the solid. Hence,...

The element is carbon and the two allotropes are diamond and graphite. Diamond has three-dimensional rigid structure and does not have any free electrons. Hence, it is hard and bad...

(d) : Graphite has a twodimensional sheet like structure and each carbon atom makes a use of sp2 hybridisation.  The above layer structure of graphite is less compact than that of...

(i) Hard water contains calcium and magnesium salts. In hard water, soaps get precipitated as calcium and magnesium soaps which being insoluble stick to the clothes as gummy mass. (ii) As...

(d) Article 214 of the Constitution says–There shall be a High Court for each State. Therefore, Reason (R) is correct. But for twenty-nine states and seven union territories we have...

(d) Nichrome is a non-magnetic alloy of nickel, chromium, and iron, usually used as a resistance wire. A common alloy is 80% nickel and 20% chromium, by mass. This alloying...

(b) Liquified Natural Gas or LNG is natural gas (predominantly methane, CH4) that has been converted temporarily to liquid form for ease of storage or transport. The liquefaction process involves...

(a) A is correct, R is correct and R is a correct explanation of A.