List of top Chemistry Questions

Calculate the cell voltage of the voltaic cell which is set up by joining following half-cells at 25°C:
Al/Al$^{3+}$(0.001 M) and Ni/Ni$^{2+}$(0.1 M)
Given: $E^\circ_{\text{Al}} = -1.66$ V, $E^\circ_{\text{Ni}} = -0.25$ V, $n_{\text{Al}} = 3$, $n_{\text{Ni}} = 2$
Complete the following reactions by writing the structural formulae of ‘A’ and ‘B’:
(i) CH$_3$CH=CH$_2$ + HBr $\xrightarrow{\text{Peroxide}}$ ‘A’ $\xrightarrow{KOH}$ ‘B’
(ii) CH$_3$CH$_2$CHCl + alc. KOH $\xrightarrow{\Delta}$ ‘A’ $\xrightarrow{\text{H}_2\text{O}}$ ‘B’ (Main product)

Reactant ‘A’ underwent a decomposition reaction. The concentration of ‘A’ was measured periodically and recorded in the table given below:


Based on the above data, predict the order of the reaction and write the expression for the rate law.

What is meant by essential amino acids? Why are amino acids amphoteric in nature?
PCl$_3$, 2KCl does not give precipitate of AgCl with AgNO$_3$ solution. Write the structural formula and IUPAC name of the complex.
Define fuel cell. Give two advantages of fuel cell over ordinary cell.

Write the structures of the main products of the following reactions:

Assertion (A): Acetanilide is less basic than aniline.
Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen.
Assertion (A): n-Butyl chloride has higher boiling point than n-Butyl bromide.
Reason (R): C—Cl bond is more polar than C—Br bond.
Assertion (A): Cuprous salts are diamagnetic.
Reason (R): Cuprous ion has completely filled 3d-orbitals.
Assertion (A): Electrolysis of aqueous NaCl gives H$_2$ at cathode and Cl$_2$ at anode.
Reason (R): Chlorine has higher oxidation potential than H$_2$O.
Alkenes are formed by heating alcohols with conc. H$_2$SO$_4$. The first step in the reaction is:
Polyhalogen compounds have wide application in industries and agriculture. DDT is also a very important polyhalogen compound. It is a:
Out of the following statements, the incorrect statement is:
The product of the oxidation of I$^-$ with MnO$_4^-$ in alkaline medium is:
Out of 2-Bromobutane, 1-Bromobutane, 2-Bromopropane and 1-Bromopropane, the molecule which is chiral in nature is:
The value of Henry's constant K$_H$ is:
Hoffmann Bromamide degradation reaction is given by:

In the Haworth structure of the following carbohydrate, various carbon atoms have been numbered. The anomeric carbon is numbered as:

In an electrochemical cell, the following reaction takes place : $2\text{Cu}^{2+} (\text{aq}) + \text{Zn} (\text{s}) \rightarrow 2\text{Cu} (\text{s}) + \text{Zn}^{2+} (\text{aq})$
$E^\circ_{\text{cell}} = 1.28 \, \text{V}$
As the reaction progresses, what will happen to the overall voltage of the cell?
Why ammonolysis of alkyl halides is not a good method to prepare pure amines?
Order of limiting molar conductivities of these cations at 298 K is:

(a) Calculate the standard Gibbs energy (\(\Delta G^\circ\)) of the following reaction at 25°C: 
\(\text{Au(s) + Ca\(^{2+}\)(1M) $\rightarrow$ Au\(^{3+}\)(1M) + Ca(s)} \)
\(\text{E\(^\circ_{\text{Au}^{3+}/\text{Au}} = +1.5 V, E\)\(^\circ_{\text{Ca}^{2+}/\text{Ca}} = -2.87 V\)}\)
\(\text{1 F} = 96500 C mol^{-1}\)

Define the following: 
(i) Cell potential
(ii) Fuel Cell

Calculate the emf of the following cell at 25°C: 
\[ \text{Zn(s)} | \text{Zn}^{2+}(0.1M) || \text{Cd}^{2+}(0.01M) | \text{Cd(s)} \] Given: \[ E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0.40 \, V, \, E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \, V \] \[ [\log 10 = 1] \]