Which of the following compounds is not an antacid?

$A$ large horizontal surface moves up and down in $SHM$ with an amplitude of $1 \, cm$. If a mass of $10 \, kg$ (which is placed on the surface) is to remain continually in contact with it,the maximum frequency of $SHM$ will be ... $Hz$.

The frequency of vibration in a vibration magnetometer of the combination of two bar magnets of magnetic moments $M_1$ and $M_2$ is $6 ~Hz$ when like poles are tied together and it is $2 ~Hz$ when the unlike poles are tied together,then the ratio $M_1: M_2$ is

Who discovered $TMV$ (Tobacco Mosaic Virus)?

The vector $c \cdot (b+c) \times (a+b+c)$ is equal to

What is the $IUPAC$ name of the following compound?