List of top Chemistry Questions

0.1 M solution of KI reacts with excess of \( \text{H}_2\text{SO}_4 \) and KIO\(_3\), according to the equation: \[ 5I^- + 6H^+ \rightarrow 3I_2 + 3H_2O \]
Identify the correct statements:
  • (A) 200 mL KI solution reacts with 0.004 mol of KIO3
  • (B) 200 mL KI solution reacts with 0.006 mol of H2SO4
  • (3) 0.5 L KI solution produced 0.005 mol of I2
  • (4) Equivalent weight of KIO3 is equal to Molecular weight / 5
The major product of the following reaction is:
6-Phenylhepta-2,4-diene
Consider the following cases of standard enthalpy of reaction (\( \Delta H_f^\circ \) in kJ mol\(^{-1}\)): \[ \text{C}_2\text{H}_6(g) + 7 \text{O}_2(g) \rightarrow 2 \text{CO}_2(g) + 3 \text{H}_2\text{O}(l) \quad \Delta H_1^\circ = -1550 \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}_2(g) \quad \Delta H_2^\circ = -393.5 \] \[ \text{H}_2(g) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{H}_2\text{O}(g) \quad \Delta H_3^\circ = -286 \] The magnitude of \( \Delta H_f^\circ \) of \( \text{C}_2\text{H}_6(g) \) is \(\_\_\_\_\_\) kJ mol\(^{-1}\) (Nearest integer). 
Which of the following binary mixture does not show the behavior of minimum boiling azeotropes?

The pH of a 0.01 M weak acid $\mathrm{HX}\left(\mathrm{K}_{\mathrm{a}}=4 \times 10^{-10}\right)$ is found to be 5 . Now the acid solution is diluted with excess of water so that the pH of the solution changes to 6 . The new concentration of the diluted weak acid is given as $\mathrm{x} \times 10^{-4} \mathrm{M}$. The value of x is _______ (nearest integer).

Which of the following is the correct order of acidic strength for the following compounds: HNO\(_3\), HClO\(_4\), and HClO\(_3\)?

The compounds that produce CO$_2$ with aqueous NaHCO$_3$ solution are: 

The heat of formation of \( \text{SO}_2(g) \) is given by: $$ S(g) + \frac{3}{2} O_2(g) \rightarrow SO_3(g) + 2x \, \text{kcal} $$ $$ SO_2(g) + \frac{1}{2} O_2(g) \rightarrow SO_3(g) + y \, \text{kcal} $$ 
Which of the following is an example of antifertility drug?
Explain with reason:
(i) Cr^{2+} is a reducing agent while Mn^{3+} is an oxidising agent, while both have \(d^4\) configuration.}
Calculate the potential for half-cell containing 0.01 M K\(_2\)Cr\(_2\)O\(_7\)(aq), 0.01 M Cr\(^{3+}\)(aq), and 1.0 x 10\(^{-4}\) M H\(^+\)(aq).
Concentrated nitric acid is labelled as 75%by mass. The volume in mL of the solution which contains 30 g of nitric acid is: Given: Density of nitric acid solution is 1.25 g/mL.
Based on the data given above, give plausible reason for the variation of conductivity and molar conductivity with concentration.
Concentration of KCl solution (mol/L)Conductivity at 298.15 K (S cm-1)Molar Conductivity at 298.15 K (S cm2 mol-1)
1.000 0.1113111.3
0.1000.0129129.0
0.0100.00141141.0
The correct IUPAC name for \( CH_2 = CHCH_2NHCH_3 \) is:
State Henry's law. Why are aquatic species more comfortable in cold water as compared to warm water?
State Raoult’s law for a solution containing volatile components. Why is the vapour pressure of an aqueous solution of glucose lower than that of water?
How many coulombs of electricity is required to produce 1g of sodium metal by reduction of sodium ion?
The element that has the highest melting point in the 3d series is:
Assume a living cell with 0.9%(\(w/w\)) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water. (Consider the data up to first decimal place only) The cell will:
The conversion of phenol to salicylic acid can be accomplished by
An alcohol X (C$_4$H$_{10}$O) reacts with Conc.HCl/ZnCl$_2$ to give corresponding chloride. X on dehydration forms Y, which reacts with Baeyer's reagent to give Z. What is Z?
Observe the following set of reactions
2-Methylpropene $\xrightarrow{\text{HBr}, (\text{CH}_3\text{COO})_2}$ Y
2-Methylpropene $\xrightarrow{\text{HBr}}$ X
Correct statement regarding X and Y is
First ionisation enthalpy values of the first four group 15 elements are given below. Choose the correct value for the element that is a main component of the apatite family:
The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:
Identify the homoleptic complexes with odd number of d-electrons in the central metal:

(A) [FeO4]2−      (B) [Fe(CN)6]3−

(C) [Fe(CN)5NO]2−      (D) [CoCl4]2−

(E) [Co(H2O)3F3]

Choose the correct answer from the options given below :