NEET Chemistry MCQs

A metal M forms a volatile carbonyl complex $M(CO)_x$. 0.525g of this complex is heated in a closed vessel of volume 250 mL at $50^\circ C$. The pressure inside the vessel after complete decomposition of the complex is 746 Torr. If the gas constant R is 0.0821 L atm $K^{-1} mol^{-1}$, what is the value of x in the formula $M(CO)_x$? (Assume the metal M does not contribute significantly to the pressure)

If $\vec{a}$ and $\vec{b}$ are two unit vectors such that $|\vec{a} + \vec{b}| = \sqrt{3}$, then the value of $(3\vec{a} - 4\vec{b}) \cdot (2\vec{a} + 5\vec{b})$ is:

In the $N_2O$ molecule, the central nitrogen atom can have different formal charges depending on the Lewis structure. Which of the following formal charge distributions (N-N-O) is the LEAST likely to contribute to the resonance hybrid?

Considering the isoelectronic series S^2-, Cl^-, Ar, K⁺, Ca²⁺, and the fact that electron-electron repulsion in the outermost shell influences effective nuclear charge and hence atomic radius, which of the following statements is INCORRECT?

Which of the following correctly explains the observed trend in atomic radii down Group 13 (Boron Family) considering the influence of d- and f-block electron filling in subsequent periods?

The reaction of 1 equivalent of $HBr$ with 1-phenylpropyne in the presence of peroxides yields predominantly:

Which alkyne, upon reaction with sodamide ($NaNH_2$) followed by treatment with 1-bromopropane, would yield 4-methylhex-2-yne?

How many isomers, including stereoisomers, are possible for the compound with the molecular formula $C_3H_5Cl$?

Which of the following high-spin complexes exhibits the largest Jahn-Teller distortion?

An unknown ether, upon treatment with HI, produces a single alkyl iodide. This alkyl iodide, when reacted with sodium in dry ether, forms n-hexane. Identify the original ether.