List of practice Questions

Identify the reaction related to Deacon's process

Identify the correct statements about lanthanoids
I. \(\text{Ce}^{4+}\) and \(\text{Tb}^{4+}\) act as oxidising agents
II. \(\text{Eu}^{2+}\) and \(\text{Yb}^{2+}\) act as oxidising agents
III. Mischmetal is an alloy of 95% iron and 5% lanthanoid metal
IV. \(\text{La}^{3+}\) and \(\text{Ce}^{4+}\) are diamagnetic in nature

When 100 mL of 0.2 M solution of \(\text{CoCl}_3 \cdot x\text{NH}_3\) is treated with excess of \(\text{AgNO}_3\) solution, \(3.6 \times 10^{22}\) ions are precipitated. The value of \(x\) is \((N = 6 \times 10^{23} \text{mol}^{-1})\)

An alkene X on ozonolysis gives a mixture of simplest ketone (Y) and 3-Pentanone. The IUPAC name of the alkene X is

A solid contains elements A and B. Anions of B form ccp lattice. Cations of A occupy 50% of octahedral voids and 50% of tetrahedral voids. What is the molecular formula of the solid?

Electrolysis of aqueous copper (II) sulphate between Pt electrodes gives 'X' at anode and 'Y' at cathode. X and Y are respectively

Consider a general first order reaction \(\text{A(g)} \rightarrow \text{B(g)} + \text{C(g)}\). If the initial pressure is 200 mm and after 20 minutes it is 250 mm, then the half-life period of the reaction (in minutes) is
(\(\log 2 = 0.30, \log 3 = 0.48, \log 4 = 0.60\))

The most effective coagulating agent for antimony sulphide sol is

The correct statements about the compounds of boron are
I. In borax bead test, the colour of cobalt metaborate is blue
II. Diborane is prepared by the oxidation of sodium borohydride with iodine
III. In diborane oxidation state of hydrogen is +1
IV. Boric acid is a tribasic acid

Dehydration of an organic acid X with concentrated \(\text{H}_2\text{SO}_4\) at 373K gives \(\text{H}_2\text{O}\) and gas Y. The hybridisation of the carbon in Y and nature of Y are respectively

Identify the correct statements from the following
I. Photochemical smog has high concentration of oxidising agents
II. \(\text{NO}_2\) is present in classical smog
III. Higher concentration of \(\text{SO}_2\) in air can cause stiffness of flower buds
IV. pH of rain water is approximately 7.5

Consider the given sequence of reactions.
\(\text{C}_2\text{H}_6 + \frac{3}{2}\text{O}_2 \xrightarrow[\Delta]{(\text{CH}_3\text{COO})_2\text{Mn}} \text{X} \xrightarrow{\text{Na}} \text{Y}\)
Electrolysis of aqueous solution of Y gives gases P and Q at anode. P and Q are respectively.

When sodium fusion extract of an organic compound is boiled with iron (II) sulphate solution followed by addition of concentrated \(\text{H}_2\text{SO}_4\), gives Prussian blue colour. This confirms the presence of the element

Which of the following is an example of electrophilic substitution reaction?

If the number of moles of \(\text{Fe}^{2+}\) ions oxidized by one mole of acidified \(\text{MnO}_4^-\) is \(x\), the number of moles of \(\text{Fe}^{2+}\) ions oxidized by one mole of acidified \(\text{Cr}_2\text{O}_7^{2-}\) is

One mole of an ideal gas at 300 K and 20 atm expands to 2 atm under isothermal and reversible conditions. The work done by the gas is \(-x\ \text{kJ mol}^{-1}\). The value of \(x\) is
\((R=8.3\ \text{J K}^{-1}\ \text{mol}^{-1})\)

At 1000 K, the equilibrium constant for the reaction
\(\text{CO}_2(\text{g}) + \text{H}_2(\text{g}) \rightleftharpoons \text{CO}(\text{g}) + \text{H}_2\text{O}(\text{g})\) is 0.53. In a one litre vessel, at equilibrium the mixture contains 0.25 mole of CO, 0.5 mole of \(\text{CO}_2\), 0.6 mole of \(\text{H}_2\) and \(x\) moles of \(\text{H}_2\text{O}\). The value of \(x\) is

Match the following

The correct answer is

Observe the following statements
Statement - I: Both LiF and CsI have low solubility in water
Statement - II: Low solubility of LiF in water is due to smaller hydration enthalpy of ions and that of CsI is due to its high lattice enthalpy
The correct answer is

In which of the following the s-block elements are arranged in the correct order of their melting points?

Identify the incorrect statement from the following?

Electron gain enthalpy values (\(\Delta_{eg}H\)) (in kJ mol\(^{-1}\)) of elements X, Y and Z are \(-349, -200\) and \(-295\) respectively. X, Y and Z are respectively

Observe the following list of molecules. Number of polar and non polar molecules are respectively
\(\text{NH}_3, \text{BF}_3, \text{NF}_3, \text{H}_2\text{S}, \text{CO}_2, \text{CH}_4, \text{CHCl}_3, \text{H}_2\text{O}\)

The molecule `X' has see-saw shape with central atom in \(sp^3d\) hybridization. What is `X'?

Two vessels are filled with ideal gases A and B and are connected through a pipe of zero volume as shown in figure. The stop cock is opened and the gases are allowed to mix homogeneously and the temperature is kept constant. The partial pressures of A and B respectively (in atm) are