List of top Chemistry Questions asked in CUET (UG)

According to Collision Theory, the rate constant of a chemical reaction depends on activation energy. If the activation energy of a reaction increases, then the value of the rate constant \(k\) will:
{The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is:} \[ \mathrm{CH_3Br + Nu^- \rightarrow CH_3Nu + Br^-} \]

The correct statements are:

  • Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
  • During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
  • Nucleotides are joined together by glycosidic linkage between \( C_1 \) and \( C_4 \) carbons of the pentose sugar.
  • Quaternary structure of proteins represents overall folding of the polypeptide chain.

Identify the correct statements.

  • Arginine and Tryptophan are essential amino acids.
  • Histidine does not contain heterocyclic ring in its structure.
  • Proline is a six membered cyclic ring amino acid.
  • Glycine does not have chiral centre.
  • Cysteine has characteristic feature of side chain as \( \mathrm{MeS-CH_2-CH_2-} \)
{Given below are two statements: Statement I: Among \[ [\mathrm{Cu(NH_3)_4}]^{2+}, [\mathrm{NiO_3}]^{2+}, [\mathrm{Ni(NH_3)_6}]^{2+} \text{ and } [\mathrm{Mn(H_2O)_6}]^{2+}, \] \( [\mathrm{Mn(H_2O)_6}]^{2+} \) has the maximum number of unpaired electrons. Statement II: The number of pairs among \[ [\mathrm{NiCl_4}]^{2-},\ [\mathrm{NiO_4}]^{2-} \] and \[ [\mathrm{NiO_4}],\ [\mathrm{O_4}]^{2-} \] that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below:}
\( \mathrm{MnO_4^{2-}} \) in acidic medium disproportionates to :
An organic compound \(P\) of molecular formula \( \mathrm{C_6H_{12}O_3} \) gives positive iodoform test but negative Tollens’ test. When \(P\) is treated with dilute acid, it produces \(Q\). \(Q\) gives positive Tollens’ test and also iodoform test. Identify compound \(P\).
An organic compound (P) on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with \( \mathrm{Br_2} \) and KOH forms compound (R) having molecular formula \( \mathrm{C_6H_7N} \). Name P, Q and R respectively are :
The incorrect statement from the following with respect to carbohydrates is :
{Which statements are True? A. In Hoffmann bromamide degradation, 4 moles of NaOH and 2 moles of \( \mathrm{Br_2} \) are consumed per mole of an amide. B. Hoffmann bromamide reaction is not given by alkyl amides. C. Primary amines can be synthesized by Hoffmann bromamide degradation. D. Secondary amide on reaction with \( \mathrm{Br_2} \) and NaOH will give secondary amine. E. The by-products of Hoffmann degradation are \( \mathrm{Na_2CO_3} \), \( \mathrm{NaBr} \) and \( \mathrm{H_2O} \). Choose the correct answer from the options given below:}
{Given below are two statements : Given: Molar masses of C, H, O, Cl are 12, 1, 16 and 35.5 g mol\(^{-1}\) respectively. Statement I: In 30%(w/w) solution of methanol in \( \mathrm{CCl_4} \) (at T K), the mole fraction of \( \mathrm{CCl_4} \) is equal to \(0.33\). Statement II: Mixture of methanol and \( \mathrm{CCl_4} \) shows positive deviation from Raoult's law. In the light of the above statements, choose the correct answer from the option given below :}
The correct increasing order of basic strength of the following amines/compounds is:
(I) \(C_6H_5NH_2\) (Aniline)
(II) \(NH_3\) (Ammonia)
(III) \(C_6H_5CH_2NH_2\) (Benzylamine)
(IV) \(C_2H_5NH_2\) (Ethylamine)
(V) \((C_2H_5)_2NH\) (Diethylamine)
During an electrochemistry lab session, a student uses the Nernst Equation to calculate the cell potential (\( E_{\text{cell}} \)) of a galvanic system at a non-standard temperature. Which parameter option accurately defines the scaling behavior of the cell potential relative to changes in the reaction quotient (\( Q \))?
Identify which of the following heterocyclic nitrogenous bases is found exclusively within the macromolecular structure of RNA, and is completely absent in standard double-stranded DNA structures.
The steady, progressive decrease in the atomic and ionic radii of transition metals along the lanthanide series (Lanthanide Contraction) is primarily caused by:
What is the correct official unit measurement scale used to represent Molar Conductivity (\( \Lambda_m \)) profiles within electrolytic systems?
Which of the following statement options accurately describes the structural carbohydrate linkages present inside a standard molecule of Sucrose?
According to IUPAC coordination nomenclature rules, what is the correct official name for the coordination compound represented by \( [\text{Co}(\text{NH}_3)_5(\text{Cl})]\text{Cl_2 \)?}
An organic amine compound 'X' reacts smoothly with Hinsberg's reagent (Benzenesulfonyl chloride) to form a solid precipitate. This precipitate remains completely insoluble when treated with an aqueous sodium hydroxide (\( \text{NaOH} \)) solution. Classify the amine 'X'.
Determine the spin-only magnetic moment value for a central divalent manganese gaseous ion (\( \text{Mn}^{2+} \)) based on its d-orbital electron distribution. (Atomic Number of \( \text{Mn} = 25 \))
Which of the following carbonyl compounds will undergo a self-oxidation and self-reduction reaction (Cannizzaro Reaction) when treated with a concentrated solution of a strong base (\( \text{NaOH} \))?
A first-order reaction has a specific rate constant (\( k \)) equal to \( 2.303 \times 10^{-3} \text{ s}^{-1} \). Calculate the exact time required for the initial concentration of the reactant to be reduced to exactly \( \frac{1}{10} \)th of its original value.
Which of the following biomolecules acts as the genetic material in most organisms?
The half-life of a first order reaction is 1386 s. The rate constant \(k\) is:
Which of the following compounds can show metamerism?