Which of the following is a chlorinated hydrocarbon?

Which one of the following kinds of animals are triploblastic?

The structure of $PCC$ is

On a new scale of temperature (which is linear) called the $W$ scale,the freezing and boiling points of water are $39\,^{\circ}W$ and $239\,^{\circ}W$ respectively. What will be the temperature on the new scale,corresponding to a temperature of $39\,^{\circ}C$ on the Celsius scale? ............. $^{\circ}W$

Which of the following is not correct?

From which of the following minerals is $Ra$ (Radium) obtained?