Which one of the following statements is / are correct ?

One mole of ${\text{CH}}_{\text{4}}{\text{\hspace{0.17em}and\hspace{0.17em}NH}}_{\text{4}}\text{\hspace{0.17em}at\hspace{0.17em}}$  NTP occupies same volume 

One gram mole of silver equals ${\text{108/6.023\hspace{0.17em}×\hspace{0.17em}10}}^{23}g$

One gram mole of ${\text{CO}}_{\text{2}}{\text{\hspace{0.17em}is\hspace{0.17em}6.023\hspace{0.17em}×\hspace{0.17em}10}}^{\text{23}}$ times heavier than one molecule of ${\text{CO}}_2$

One mole Ag weighs more than that of two moles of Ca