MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Chemistry

Identify the INCORRECT statement.

Which of the following statements are FALSE about lanthanoids?

(I) They have lower heat of atomization than transition metals

(II) They are soft metals with silvery white colour and densities of about 7 g cm⁻³.

(III) They react with water to give the metal hydroxide and oxygen gas.

(IV) They form hydroxides, which are covalent and basic.

An ideal gas expands isothermally and reversibly from 10 m³ to 20 m³ at 300 K, performing 5.187 kJ of work on surrounding, calculate number of moles of gas used.

Which of the following is CORRECT about alkynes?

The electronic configuration of transition element 'X' in +3 oxidation state is [Ar] 3d⁴. What is its atomic number?

Which among the following is used in the treatment of cancer?

For a process, entropy change of a system is expressed as ________.

If K_sp of a sparingly soluble salt M₂X at 25°C is 1.0 × 10⁻¹¹, the solubility of the salt in mole litre⁻¹ at this temperature will be ____________.

For a reversible spontaneous change, ∆S is ____________.

Which one of the following is an organometallic compound?

Arrange the following in order of increasing entropy.

I. 1.0 mol H₂O (298 K, 1 atm)

II. 1.0 mol H₂O (270 K, 1 atm)

III. 1.0 mol H₂O (400 K, 1 atm)

The volume in dm³ occupied by 15.0 g of ethane at STP is ____________.

Which statement(s) is/are CORRECT about applications of lanthanoid metals/ions and their compounds?

(I) The optoelectronics applications use lanthanoid ions as active ions in luminescent materials.

(II) Lanthanoid compounds are used in television tubes.

(III) Lanthanoids are used in hybrid cars, superconductors and permanent magnets.

The volume of 1 mole of any pure gas at standard temperature and pressure is always equal to ______.

The reaction in which 2 molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl is an example of ______.

How many gram of sodium (atomic mass 23 u) is required to prepare one mole of ethane from methyl chloride by Wurtz reaction?

Haloarenes are less reactive than alkyl halides towards nucleophilic substitution because ____________ in aryl halide.

What is the entropy change (in J K⁻¹ mol⁻¹) when one mole of ice is converted into water at 0°C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol⁻¹ at 0°C)

In how many of the following, ∆S is positive?

i. Melting of ice

ii. Sublimation of iodine

iii. Dissolution of CuSO₄ in water

iv. Condensation of water vapour

v. Dissociation of H₂ molecule into atoms

vi. Conversion of carbon dioxide gas to dry ice

vii. Vaporization of acetone

The only radioactive element among the lanthanoids is ____________.