Matter and its Nature

In the fcc lattice of chloride ions all the octahedral voids are occupied by cations. The algebraic sum of the number of nearest neighboring ${\mathrm{Cl}}^{-}$ions and ${\mathrm{Na}}^{+}$ions around each chloride ions is $6\mathrm{x}$. What is $\mathrm{x}$?

List out the chemical properties of matter.

Chemical properties, which are determined by careful measurement and _____.

Chemical properties of matter like composition, combustibility, reactivity with_____ and bases, etc.

Chemical properties of matter can be measured or observed without changing the identity or the composition of the substance.

Which of the following is a physical property of matter?

Melting point is a physical property of matter.

What are the physical properties of matter.

A _____is a substance formed when two or more different elements are chemically bonded together.

Helium $\left(\mathrm{He}\right)$ gas, iodine $\left({\mathrm{I}}_2\right)$, oxygen $\left({\mathrm{O}}_2\right)$ and water are elements.

Liquids exhibit diffusion.

Which of the following is compound?

The conversion of liquid into gas is called _____. (vaporisation / condensation)

The conversion of solid into liquid is called _____ process.

Water changes into water vapour on heating. This process is known as:

A gas fills completely the vessel in which it is kept.

A proton and an antiproton come close to each other in vacuum such that the distance between them is $10 \mathrm{cm}.$ Consider the potential energy to be zero at infinity. The velocity at this distance will be:

An _____ is the smallest unit of matter that contains all its properties.

One litre of $0.15 \mathrm{M}$ ${\mathrm{Na}}_2{\mathrm{SO}}_3$ aqueous solution is mixed with $500 \mathrm{mL}$ of $0.2 \mathrm{M}$ ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ aqueous solution in acid medium. What is the number of moles of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ remaining in the solution after the reaction?

Which of the following statements about a compound is incorrect?