NEET Chemistry MCQs

Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures ($P_{O_2} : P_{O_3}$) is:

A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:

A solution is prepared by dissolving 2.5g of a non-volatile solute in 100g of water. The vapor pressure of the solution is found to be 22.87 Torr at $25^\circ C$. If the vapor pressure of pure water is 23.76 Torr at the same temperature, what is the molar mass of the solute (in g/mol)?

Two vectors $\vec{A}$ and $\vec{B}$ have equal magnitudes. Under what condition will their difference have the same magnitude as either of the vectors?

A unit vector perpendicular to both $\hat{i} + \hat{j}$ and $\hat{j} + \hat{k}$ is:

If three vectors $\vec{A} = \hat{i} + 2\hat{j} - \hat{k}$, $\vec{B} = -\hat{i} + \hat{j} + \hat{k}$, and $\vec{C}$ form a right-angled triangle such that $\vec{C}$ is the hypotenuse, then a possible value of $\vec{C}$ is:

The position vector of a particle is given by $\vec{r} = (3t^2 - 2t)\hat{i} - (t^3)\hat{j}$. The velocity of the particle at $t=2$ s is perpendicular to:

If $\vec{A}$ and $\vec{B}$ are two non-zero vectors such that $|\vec{A} + \vec{B}| = |\vec{A} - \vec{B}|$, which of the following must be true?

10 g of a metal oxide on strong heating gave 6.4 g of metal. If the formula of the metal oxide is $M_2O_3$, what is the atomic mass of the metal M?

A sample of hydrated copper sulfate ($CuSO_4 \cdot xH_2O$) weighs 25 g. Upon heating to drive off all the water, the anhydrous copper sulfate ($CuSO_4$) remaining weighs 16 g. What is the value of 'x' (the number of water molecules of crystallization)?