NEET Chemistry MCQs

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:

Which of the following is NOT a characteristic of a null vector?

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?

A mixture of $CO$ and $CO_2$ weighing 1.12 g is treated with an excess of red hot $CuO$. The $CO$ is converted to $CO_2$. The total weight of $CO_2$ produced is 1.6 g. What was the weight percentage of $CO$ in the original mixture?

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?

Two elements X and Y combine to form two compounds $XY_2$ and $X_2Y_3$. If 0.05 moles of $XY_2$ weighs 5 g and 0.10 moles of $X_2Y_3$ weighs 20 g, find the atomic masses of X and Y.

Which of the following experiments definitively proved the Law of Conservation of Mass?