Magnesium hydroxide $\left[\mathrm{Mg}\left({\mathrm{OH}}_2\right)\right]$ is used as _____.

Which one of the following gases burns with pop sound?

Read the given statements and select the correct option:

Statement I: Husk is separated from heavier seeds of grain by winnowing.
Statement II: Difference in the size of particles in a mixture is utilized to separate them by the process of sieving and filtration.

'Copper cannot displace zinc from its salt solution'. Give the reason.

The following reasons are given by Class VIII students:
I. Copper is more reactive than zinc.
II. Copper is less reactive than zinc.
III. Zinc is one of the noble metals.
IV. Zinc appears below copper in the reactivity series.
Select the correct reason(s) from the reasons given by Class VIII students.

Read the given statements and select the correct option:

Statement I: The range of clinical thermometer is from ${35}^{\mathrm{o}}\mathrm{C}$ to ${42}^{\mathrm{o}}\mathrm{C}.$
Statement II: The range of laboratory thermometer is usually from ${10}^{\mathrm{o}}\mathrm{C}$ to ${110}^{\mathrm{o}}\mathrm{C}.$