Which one of the following statements is not correct about the three states of matter,i.e.,solid,liquid,and gaseous?

  • A
    Molecules of a solid possess least energy,whereas those of a gas possess highest energy.
  • B
    The density of solid is highest,whereas that of gases is lowest.
  • C
    Gases,like liquids,possess definite volumes.
  • D
    Molecules of a solid possess vibratory motion.

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Which of the following is true about the gaseous state?

At $27^{\circ} C$, a closed vessel contains a mixture of equal weights of helium (mol. wt. = $4$), methane (mol. wt. = $16$) and sulphur dioxide (mol. wt. = $64$). The pressure exerted by the mixture is $210 \ mm$. If the partial pressures of helium, methane and sulphur dioxide are $p_1, p_2$ and $p_3$ respectively, which one of the following is correct?

If a gas diffuses $1/5$ times as fast as hydrogen,its molar mass will be....

The rate of diffusion of a gas is ..... times that of hydrogen. (Molecular weight = $98$)

Provide the $SI$ units for the following gas properties:
$(i)$ Mass $(ii)$ Volume $(iii)$ Temperature $(iv)$ Pressure

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