List of top Chemistry Questions

Choose the Diamagnetic triopositive ion of Lanthanoids: A. La, B. Ce, C. Eu, D. Yb, E. Lu.

IR absorption spectra of metal carbonyl determine: A. Geometry of mononuclear metal carbonyls, B. Determine bond order of CO bond, C. Differentiating between terminal and bridging CO, D. Enatiomerism in metal carbonyls, E. Study of Reaction Rates of Substitution reactions.

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

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The equivalent conductance of weak electrolyte falls off much more rapidly with increase in concentration. Reason (R): The equivalent conductance of weak electrolyte at infinite dilution can be determined by extrapolation of the curve between equivalent conductance vs $\sqrt{c}$ to zero concentration.}

Arrange the following four compounds in increasing order of their stability, if their heat of formation in standard states are given as: A. $-500~kJ~mol^{-1}$, B. $+700~kJ~mol^{-1}$, C. $-900~kJ~mol^{-1}$, D. $+250~kJ~mol^{-1}$.}

Match List - I with List - II: A. $\mu_{i}$, B. $\overline{V}_{i}$, C. $\overline{S}_{i}$, D. $\mu_{i}^{\circ}$. Relations: I. $(\frac{\partial\mu i}{\partial p})_{T,n_{i}}$, II. $(\frac{\partial G}{\partial ni})_{T,P,n_{j}}$, III. $-(\frac{\partial\mu i}{\partial T})_{P,n_{i}}$, IV. $\mu_{i}-RT~ln~p_{i}$.}

Which of the following statements is not correct with reference to a catalyst?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The enthalpy of any strong acid by a strong base is practically the same ($-13.7~kCal~mol^{-1}$). Reason (R): Every neutralization reaction involves the combination of $H^{+}$ and $OH^{-}$ ions to form water.}

In a reaction $A+B\rightarrow P$ rate is doubled when [B] is doubled, and the rate increases by 8 when both [A] and [B] are doubled. The rate law is:

Match the Indicators (List-I) with their pH range (List-II): A. Methyl orange, B. Phenolphthalein, C. Methyl red, D. Phenol red. Ranges: I. 6.8-8.4, II. 4.2-6.3, III. 3.1-4.4, IV. 8.3-10.0.

Assertion (A): Reactions between ions in solution are usually much faster than reactions between covalent substances. Reason (R): Covalent compounds are not soluble in water.

Which of the following conditions are correct? A. $\Delta H$ is +ve, $\Delta S$ is -ve at any T (non-spontaneous). B. $\Delta H$ is -ve, $\Delta S$ is -ve at low T (non-spontaneous). C. $\Delta H$ is +ve, $\Delta S$ is +ve at low T (spontaneous). D. $\Delta H$ is -ve, $\Delta S$ is +ve at any T (spontaneous).

Arrange the following in order of their decreasing ionic strength: A. 0.1 m NaCl, B. 0.01 m $K_{2}SO_{4}$, C. 0.001 m $AlCl_{3}$, D. 0.01 m glucose.}

0.28 g of the following are dissolved in 1 L of water. Arrange them in increasing order of their molarities: A. Glucose ($C_{6}H_{12}O_{6}$), B. Urea ($NH_{2}CONH_{2}$), C. Benzoic Acid ($C_{6}H_{5}COOH$), D. Sucrose ($C_{12}H_{22}O_{11}$).

Arrange the following gases in increasing order of their critical temperatures: A. $W (a=4.0, b=0.027)$, B. $X (a=8.0, b=0.030)$, C. $Y (a=6.0, b=0.032)$, D. $Z (a=12, b=0.027)$.

A molecule XY (mol. wt $180~g~mol^{-1}$) undergoes second order association in water. If the van't Hoff factor 'i' of the substance is 0.88; the degree of association of the substance is:

Consider the redox reaction $Mg_{(s)}+2~Ag_{(aq)}^{+}\rightarrow Mg_{(aq)}^{2+}+2~Ag_{(s)}$. The expression of cell emf at 298 K is:

The capillary action tendency of a liquid is a consequence of:

Which of the following are correct with reference to Maxwells-Boltzmann distribution of velocities? A. The fraction of molecules with very low ($c\rightarrow0$) and very high ($c\rightarrow\infty$) velocities is very small. B. The area under different curve obtained at different temperature is same. C. The maximum of the curve represent average velocity at a particular temperature. D. The area under the curve represents total number of molecules.

pH of a 0.01 M $Ca(OH)_{2}$ solution is: (Given $log_{10} 2 = 0.3010$)}

Which of the following is/are intensive property/ies? A. Volume, B. Density, C. Energy, D. Pressure, E. Molar heat Capacity

Which of the following equation is not correct?

A bulb is rated at \(150\ watt\), converting \(8%\) energy into light. If energy of one photon is \(4.42\times10^{-19}J\), how many photons are emitted by the bulb per second?

Identify the product C in the series.
C$_6$H$_5$NO$_2 \xrightarrow{\text{Fe/HCl}} A \xrightarrow{\text{NaNO}_2\text{+HCl, } 273\text{ K}} B \xrightarrow{\text{H}_2\text{O, } 283\text{ K}} C$