List of top Chemistry Questions asked in Delhi UMET/DPMT

A chemical reaction proceeds into the following steps Step I,$\hspace15mm 2A \rightleftharpoons X$ fast Step II,$\hspace10mm X + B \rightleftharpoons Y$ slow Step III,$\hspace10mm Y + B \rightleftharpoons $ Product fast The law for the overall reaction is

A solution is $0.1 M$ with respect to $Ag ^{+}, Ca ^{2+}, Mg ^{2+}$ and $Al ^{3+}$, which will precipitate at lowest concentration of $\left[ PO _{4}^{3-}\right]$ when solution of $Na _{3} PO _{4}$ is added?

Most stable carbocation is

Given a gas phase reaction, $\hspace10mm 2A(g)+B(g) \rightleftharpoons C(g)+D(g)$ Which one of the following changes will affect the value of $K_c$?

The equilibrium constant for mutarotation $\alpha-D \rightleftharpoons \beta-D$ Glucose is $1.8$. What percentage of $\alpha$ form remains at equilibrium?

Number of isomeric forms (constitutional and stereoisomers) for $ [Rh(en)_{2}(NO_{2})\,(SCN)^{+} $ are

Maltose gives rise to two molecules of

Identify the reagents $(X, Y, Z)$ used in the conversion of $3$-methylaniline to $3$-nitrotoluene.

The correct decreasing order of dipole moment in $ CH_{3}Cl,\,CH_{3} Br$ and $ CH_{3}F $ is

Which of the following represents the arrangement in increasing order of bond order and bond dissociation energy?

For a first order reaction, the time required for $99.9\%$ of the reaction to take place is nearly

The size of the nucleus of an atom of mass number $A$ is proportional to

Which of the following reactions involves carbon-carbon bond formation

In the change of $NO \, \to\, NO^+$ the electron is added to

Chlorobenzene is ...... reactive than benzene towards electrophilic substitution and directs the incoming electrophile to the ...... position.

Which of the following reactions involves carbon-carbon bond formation?

Two ice cubes are pressed over each other until they unite to form one block. Which one of the following forces dominates for holding them together ?

Which of the following is chiral?

In the following reaction $NH _{4}^{+}+ BiN \rightarrow NH _{3}+ Bi ^{3+} NH _{4}^{+}$ is acting as an

The following solids are formed by $X,\, Q$ and $Z.\, XY_{2},\,X_{2}Z,\,QZ$ . Then the formula of the compound formed by $Q$ and $Y$ is

In the following complex compound $\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right]^{+}$, Co and $Cl$ are collinear. Which of the following structures is possible?

In the given compound which of the following hydrogens is most acidic? $\underset{(a)}{CH_3} -\underset{(b)}{CH_2} -\overset{\underset{||}{O}}{C} -\underset{(c)}{CH_3}$

Identify $B$ in the following reaction

Which of the following is not present in a nucleotide?

$\Psi^{2}=0$ represent