List of top Chemistry Questions

Match List-I with List-II. \begin{tabbing} \hspace{5cm} \= \hspace{3cm} \= \hspace{4cm} \= \hspace{5cm} \= \kill List-I \hspace{1cm} \= Isomers of \( C_{10}H_{14} \) \hspace{2cm} \= List-II \hspace{2cm} \= Ozonolysis product
What is the shape of the \( \text{ClO}_2^- \) ion according to VSEPR theory?
Which of the following graphs most appropriately represents a zero-order reaction?
In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?
In the reaction \( 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 \), what is the role of potassium iodide (KI) in this reaction?
Given below are two statements about X-ray spectra of elements:
Statement (I):A plot of \(\sqrt {v}\) (v=frequency of X-rays emitted) vs atomic mass is a straight line.
Statement (II): A plot of v (v=frequency of X-rays emitted)} vs atomic number is a straight line.
The bond dissociation enthalpy of \( X_2 \) calculated from the given data is ---- kJ mol\(^{-1}\) (nearest integer). % Given Data: \[ M(s) + X(s) \rightarrow M^+(g) + X^-(g) \quad \Delta H_{\text{lattice}} = 800 \, \text{kJ/mol} \] \[ M(s) \rightarrow M(g) \quad \Delta H_{\text{sub}} = 100 \, \text{kJ/mol} \] \[ M(g) \rightarrow M^+(g) + e^-(g) \quad \Delta H_{\text{i}} = 500 \, \text{kJ/mol} \] \[ X(g) + e^-(g) \rightarrow X^-(g) \quad \Delta H_{\text{eg}} = -300 \, \text{kJ/mol} \] \[ M(s) + X_2(g) \rightarrow M^+X^-(s) \quad \Delta H_{\text{f}} = -400 \, \text{kJ/mol} \]
The ascending order of relative rate of solvolysis of the following compounds is: \includegraphics[]{60.PNG} \begin{itemize} \item (A) Cyclohexyl bromide \item (B) Benzyl bromide \item (C) Phenylmethyl bromide \item (D) Allyl bromide \end{itemize}
Given below are two statements: Statement (I): For a given shell, the total number of allowed orbitals is given by \( n^2 \). Statement (II): For any subshell, the spatial orientation of the orbitals is given by \( -l \) to \( +l \) values including zero. In the light of the above statements, choose the correct answer from the options given below:
Consider a binary solution of two volatile liquid components 1 and 2. \(x_1\) and \(y_1\) are the mole fractions of component 1 in the liquid and vapor phase, respectively. The slope and intercept of the linear plot of \( \frac{1}{x_1} \) vs \( \frac{1}{y_1} \) are given respectively as:
When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if the decrease in vapour pressure is 20 mm of Hg?
Identify the coordination complexes in which the central metal ion has a \(d^4\) configuration.
Identify the coordination complexes
Choose the correct answer from the options given below :
Identify the products [A] and [B] respectively in the following reaction:
Identify the products [A] and [B] respectively in the following reaction:
Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes. In the light of the above statements, choose the correct answer from the options given below:
Consider the following reactions: \[ \text{NH}_2 \text{O} \xrightarrow{\text{NaNO}_2, \text{HCl}, 0-5^\circ C} [A] \xrightarrow{\text{HCl dil.}, \text{NaOH}} [B] \] - (i) The molecular formula of [A] is C₁₄H₁₄N₂O₂
- (ii) The molecular formula of [C] is C₁₆H₁₈N₂O₂ The total number of sp³ hybridized carbon atoms in the major product [C] formed is -----.
Given below are the atomic numbers of some group 14 elements. The atomic number of the element with the lowest melting point is:
When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ----- (nearest integer).
Consider the following reactions: \[ K_2Cr_2O_7 + 2 KOH \xrightarrow{ \text{heat} } [A] \] \[ [A] + H_2SO_4 \xrightarrow{} [B] + K_2SO_4 \] The products [A] and [B], respectively are:
Which of the following compounds exhibits ionic bonding?
Consider a complex reaction taking place in three steps with rate constants \(k_1\), \(k_2\), and \(k_3\) respectively. The overall rate constant \(k\) is given by the expression \( k = \sqrt{\frac{k_1 k_3}{k_2}} \). If the activation energies of the three steps are 60, 30, and 10 kJ mol\(^{-1}\) respectively, then the overall energy of activation in kJ mol\(^{-1}\) is ________________(Nearest integer).
The hydrocarbon (X) with molar mass 80 g mol\(^{-1}\) and 90%carbon has ________________ degree of unsaturation.
The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is:________________

The observed and normal molar masses of compound MX2 are 65.6 and 164 respectively. The percent degree of ionisation of MX2 is ________________% (Nearest integer).
 

In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide (AgBr). The percentage of Bromine in the organic compound is ________________ × 10-1% (Nearest integer).
(Given: Molar mass of Ag is 108 and Br is 80 g mol-1)

The best reagent for converting propanamide into propanamine is: