List of top Chemistry Questions

Assertion (A): In $S_N1$ reaction racemic mixture is formed and in $S_N2$ reaction inversion of configuration is observed. Reason (R): $S_N1$ reaction is concerted mechanism and $S_N2$ reaction involves carbocation intermediate.

Assertion (A): Carbon halogen bond in aryl and vinyl halides are unusually shorter. Reason (R): Chlorobenzene and vinyl chlorides undergo $S_N1$ and $S_N2$ reaction in general.

The Interhalogen compound used in the estimation of iodine number in fats and oils is:

Find the product X, Y in the following reaction:

Natural Mechanism in human body to inhibit the heavy metal ion poisoning is by:

IUPAC name of the following compound is:

The Radial wave function for 2p orbital is:

In metal carbonyl, IR absorption can distinguish nature of CO because:

Using the Pourbaix Diagram for Iron, choose the Incorrect statement:

What type of bonding is present in clathrate compounds?

Which of the following organometallic complex do NOT OBEY 18 EAN Rule?

The element with highest Electron Affinity among Group 16 is:

Match List - I (Compounds) with List - II (Applications): (A) Silicones, (B) Boranzines, (C) Phosphazenes, (D) Poly siloxanes

For Schrodinger Wave Equation $\nabla^{2}\psi+\frac{8\pi^{2}m}{h^{2}}(E-V)\psi=0$, an acceptable solution does NOT possess which of the following property?}

Assertion (A): In $B_{2}H_{6}$, two bridging H atoms prevent the rotation between B atoms. Reason (R): Terminal B-H bonds are normal covalent bonds i.e. two centre two electron ($2C-2e$) bonds.}

Match List - I (Compounds) with List - II (Geometry): (A) $XeF_{2}$, (B) $XeF_{4}$, (C) $XeF_{6}$, (D) $XeO_{3}$}

Assertion (A): In $[Ti(H_{2}O)_{6}]^{3+}$ electronic spectra the observed absorption is unsymmetrical appears to be result of more than one absorption bands. Reason (R): Due to Jahn Teller effect energy of $d_{xy}$ is lowered so shown electronic jump $d_{xy}^{1} \rightarrow d_{x^{2}-y^{2}}$ and $d_{xy}^{1} \rightarrow d_{z^{2}}$ so give rise two absorption bands.}

Assertion (A): He and Ne do not form clathrates. Reason (R): He and Ne can be separated from Ar, Kr and Xe using quinol from the mixture of these gas.

Match List - I (Compounds) with List - II (Hybridization and no. of L.P.): (A) $SF_{4}$, (B) $ClF_{3}$, (C) $H_{2}O$, (D) $NH_{3}$}

Arrange the following ligands as per increasing hepticity: A. Allyl, B. Butadiene, C. Phenyl, D. Tropillium, E. Cyclooctatriene.

The correct sequence of Extraction of Lanthanoids from monazite sand is: (A) Treat with cold water, (B) Dilute and adjust pH in alkaline range, (C) Digest with Conc. $H_{2}SO_{4}$ at $200^{\circ}C$, (D) Separation by ion Exchange method, (E) Add $Na_{2}SO_{4}$}

Arrange the following in increasing order of spin only magnetic movement: (A) $Co^{2+}$, (B) $Ti^{3+}$, (C) $Ti^{2+}$, (D) $Fe^{2+}$, (E) $Sc^{3+}$}

Arrange the following in increasing order of electron affinity: (A) F, (B) Cl, (C) Br, (D) I, (E) At

Assertion (A): $Na^{+}(C_{5}H_{11})^{-}$ is more stable than $Na^{+}(C_{5}H_{5})^{-}$. Reason (R): $C_{5}H_{5}$ readily accept electron to become 6-electron aromatic $C_{5}H_{5}^{-}$.}

Choose the paramagnetic species: A. $O_{2}^{2-}$, B. $NO^{+}$, C. $O_{2}$, D. $CO^{+}$, E. NO.}