Which of the following mixtures is known as fusion mixture?

Which of the following is the main component of Portland cement (besides lime)?

The correct order of solubility in water is:

Holme's signals can be obtained by using

Consider three metal chlorides $x$, $y$ and $z$, where $x$ is water soluble at room temperature, $y$ is sparingly soluble in water at room temperature and $z$ is soluble in hot water. $x$, $y$ and $z$ are respectively:

The composition of 'Golden spangles' is