Mole Concept

The isotopes of an element have similar chemical and physical properties.

Why is the law of constant proportion proposed?

The standard room temperature in Kelvin is _______.

The STP (standard temperature and pressure) condition stands for:

Silver (atomic weight = $108 \mathrm{g} {\mathrm{mol}}^{-1}$ ) has a density of $10.5 \mathrm{g} {\mathrm{cm}}^{-3}$ . The number of silver atoms on a surface of area ${10}^{-12} {\mathrm{m}}^2$ can be expressed in scientific notation as $\mathrm{y}\times {10}^{\mathrm{x}}$. The value of x is

What are STP and NTP? Write its significance. 

Give one line/one word to answer.
Standard pressure of a gas in mm of Hg.

The standard temperature in $\mathrm{K}$ 

Standard temperature in ${}^{\mathrm{o}}\mathrm{C}$

Write the value of Standard pressure in torr.

Write the value of Standard pressure in $\mathrm{atm}$.

Write the value of Standard pressure in cm of Hg.

Write the value of Standard pressure in mm of Hg.

State -The STP conditions.

Why is it necessary to compare gases at STP? 

What is STP or NTP denote.

What is the molar volume of a gas at STP condition?

Give reasons.

 Isotopes of an element have the same atomic numbers.

The number of moles of ${\mathrm{KMnO}}_4$ that will be needed to react with one mole of Sulphite ion in acidic solution is       

12 litres of ${\mathrm{H}}_2$ and 11.2 litres of ${\mathrm{Cl}}_2$ are mixed and exploded. The composition by volume of the mixture is: