$I$. Two non-zero,non-collinear vectors are linearly independent.
$II$. Any three coplanar vectors are linearly dependent.
Which of the above statements is/are true?

In which of the following are vessels and companion cells found?

Which gas is released when $Na_2CO_3$ is heated?

$A$ sodium atom is in one of the states labeled 'Lowest excited levels'. It remains in that state for an average time of $10^{-8} \ s$,before it makes a transition back to a ground state. What is the uncertainty in energy of that excited state?

Which of the following compounds is wrongly named?

The number of radial nodes of $3s$ and $2p$ orbitals respectively are