Which of the following components of cement is present in the highest amount?

Electric furnaces are lined with magnesia because

In the hardening stage of Plaster of Paris, the compound formed is:

$A$ metal $M$ readily gives $MSO_4$, which is soluble in water. It forms its oxide $MO$ which is amphoteric. It forms an insoluble hydroxide $M(OH)_2$, which is soluble in $NaOH$ solution. The $M$ is

Which property of the alkaline earth metals increases with their atomic number?

The element that does $NOT$ form an acidic oxide is