List of practice Questions

Consider the following organic halides:
(I) Bromobenzene,
(II) 2-Bromopropane,
(III) 1-Bromopropane.
The correct order of reactivity towards \(S_N2\) reaction is:

The number of \(\alpha\)-hydrogens present in the major product (X) in the given reaction is:
(Reaction: Alkyl halide + alc. KOH \(\rightarrow\) X)

Which one of the following is not correct?

Which of the following colloidal system represents a gel?

Which refining method involves the reactions I and II shown below? I. \(Zr_{(Impure)} + 2I_2 \rightarrow ZrI_4\) II. \(ZrI_4 \xrightarrow{1800 K} Zr_{(Pure)} + 2I_2\)

Which anion of the simple salt can be confirmed by Brown ring test?

Which of the following reactions is non-spontaneous?

The fusion of chromite ore with \(Na_2CO_3\) in free access of air leads to the formation of yellow coloured solution of compound A and residue B along with the evolution of \(CO_2\) gas. Identify the correct statements regarding A and B.
I. A contains Cr-O-Cr linkage
II. B is \(Fe_2O_3\)
III. Oxidation state of chromium in A is +6

Which of the following exhibit only geometrical isomerism?

An alkene (X) with formula \(C_5H_{10}\) on ozonolysis gives butanone and methanal. X with HBr in the presence of organic peroxide gives Y as major product. When Y is subjected to Wurtz reaction gives Z. The number of \(1^{\circ}, 2^{\circ}\) and \(3^{\circ}\) carbons in Z respectively are:

Which of the following is not correct about the hexagonal close packing?

At \(27^{\circ}C\), x g of \(C_6H_{12}O_6\) (molar mass = \(180 \text{ g mol}^{-1}\)) and y g of a non-volatile, non-electrolyte (molar mass = \(92 \text{ g mol}^{-1}\)) were present separately in 1.0 L solutions. The osmotic pressure of two solutions is equal. What is x/y?

\(E_{cell}\), for the cell given below is 0.82 V. What is its \(E^{\circ}\) value? \(Fe | Fe^{2+}(0.001 \text{ M}) || Cu^{2+}(0.1 \text{ M}) | Cu\). (Given: \(\frac{2.303 RT}{F} = 0.06 \text{ V}\))

The resistance of a conductivity cell filled with 0.02 M KCl solution is 85 \(\Omega\) at \(25^{\circ}C\). Conductivity of this solution is \(0.3 \text{ S m}^{-1}\). Resistance of 0.0025 M \(K_2SO_4\) solution taken in the same cell is 300 \(\Omega\). The molar conductivity of 0.0025 M \(K_2SO_4\) solution (in S \(\text{m}^2 \text{mol}^{-1}\)) is:

Hydrolysis of benzene diazonium chloride follows first order kinetics. The time taken for its decomposition to 1/8 and 1/10 of its original concentration are \([t_{1/8}]\) and \([t_{1/10}]\) respectively. What is the ratio of \([t_{1/8}]\) to \([t_{1/10}]\)? (\(\log 2=0.30\), \(\log 3=0.48\), \(\log 4=0.60\))

In a flask, 2 g of activated charcoal was added to 100 mL of acetic acid solution of 0.06 N. After 2 hours, the solution was filtered. The concentration of filtrate was found to be 0.04 N. The mass of acetic acid (in mg) adsorbed per gram of charcoal is:

An element X reacts with air to form monoxide and nitride. This oxide is amphoteric. It can be converted to its chloride by heating with carbon and chlorine. Which of the following is correct for X?

In group 13 elements, element Y has the lowest boiling point and element Z has lowest melting point. The nature of oxides of Y and Z is respectively:

Consider the following statements:
Statement - I: In three dimensional network of \(SiO_2\), if few Si atoms are replaced by Al atoms, the resulting structure acquires a positive charge.
Statement - II: Silicones are organo - silicon polymers which have \((R_2SiO)\) as a repeating unit.

High levels of which pollutant in blood induce premature delivery in pregnant women, who have the habit of smoking?

The IUPAC name of the following hydrocarbon is:

1.5 g of an organic compound was analysed by Kjeldahl's method for estimation of nitrogen. The ammonia liberated was passed into 30 mL of 1N HCl solution. The remaining HCl was further neutralised by 120 mL of N/10 NaOH solution. The percentage of nitrogen in the compound is:

At T(K) in a reaction \(A(g) \rightarrow B(g) + C(g)\), x J of heat was absorbed and y J of work is done by the system. What is \(\Delta_r H\) (in J) for the reaction? (R= gas constant)

Observe the following reaction \(A(g) + B(g) \rightleftharpoons C(g)\). In a 1L closed flask, 2 moles of \(A(g)\) and 1 mole of \(B(g)\) were taken and heated to T(K). At equilibrium, the concentration of \(B(g)\) is equal to twice the equilibrium concentration of \(C(g)\). What is the value of \(K_c\)?

A solution is prepared by adding 0.5 L of 0.5 M NaOH to 0.5 L of 0.55 M formic acid. What is the pH of the resultant solution? (\(K_a\) of formic acid = \(1.8 \times 10^{-4}\); \(\log(1.8) = 0.26\))