MHT CET PYQs for Nernst Equation with Solutions: Practice MHT CET Previous Year Questions

1.

Which of the following compounds will give racemic mixture on nucleophilic substitution by \( \text{OH}^- \) ion? \includegraphics[width=5cm]{71.png}

• \( (i) \)
  
• \( (i), (ii), and (iii) \)
  
• \( (ii) and (iii) \)
  
• \( (i) and (iii) \)
  

2.

Which one of the carbanions is the least stable?

3.

The wavelength of the radiation emitted, when a hydrogen atom electron falls from infinity to stationary state 1, would be: (Rydberg constant \( R = 1.097 \times 10^7 \, \text{m}^{-1} \))

• \( 406 \, \text{nm} \)
  
• \( 192 \, \text{nm} \)
  
• \( 91 \, \text{nm} \)
  
• \( 9.1 \times 10^{-8} \, \text{nm} \)
  

4.

The value of the 'spin only' magnetic moment for one of the following configurations is \( 2.84 \, \mathrm{BM} \). The correct one is:

• \( d^5 \, (\text{in strong ligand field}) \)
  
• \( d^3 \, (\text{in weak as well as strong fields}) \)
  
• \( d^4 \, (\text{in weak ligand fields}) \)
  
• \( d^4 \, (\text{in strong ligand fields}) \)
  

5.

Alkali metals are powerful reducing agents because:

• They are metals
  
• They are monovalent
  
• Their ionic radii are large
  
• Their ionisation energies are low
  

6.

People living at high altitudes often reported a problem of feeling weak and inability to think clearly. The reason for this is:

• At high altitudes the partial pressure of oxygen is less than at the ground level.
  
• At high altitudes the partial pressure of oxygen is more than at the ground level.
  
• At high altitudes the partial pressure of oxygen is equal to that at the ground level.
  
• None of these
  

7.

A balloon filled with an air sample occupies \( 3 \, \text{L} \) volume at \( 35^\circ \text{C} \). On lowering the temperature to \( T \), the volume decreases to \( 2.5 \, \text{L} \). The temperature \( T \) is: [Assume \( P \)-constant]

• \( 16^\circ \text{C} \)
  
• \( -16^\circ \text{C} \)
  
• \( 24^\circ \text{C} \)
  
• \( -20^\circ \text{C} \)
  

8.

Which of the following arrangements does not represent the correct order of the property stated against it?

• \( \text{V}^{2+}<\text{Cr}^{2+}<\text{Mn}^{2+}<\text{Fe}^{2+} \): Paramagnetic behaviour
  
• \( \text{Ni}^{2+}<\text{Co}^{2+}<\text{Fe}^{2+}<\text{Mn}^{2+} \): Ionic size
  
• \( \text{Co}^{3+}<\text{Fe}^{3+}<\text{Cr}^{3+}<\text{Sc}^{3+} \): Stability in aqueous solution
  
• \( \text{Sc}<\text{Ti}<\text{Cr}<\text{Mn} \): Number of oxidation states
  

9.

Chlorobenzene reacts with Mg in dry ether to give a compound (\( A \)) which further reacts with ethanol to yield:

• \( \text{Phenol} \)
  
• \( \text{Benzene} \)
  
• \( \text{Ethylbenzene} \)
  
• \( \text{Phenyl ether} \)
  

10.

Identify ortho and para directing groups from the following: \[ -\text{CHO}, -\text{NHCOCH}_3, -\text{OCH}_3, -\text{SO}_3\text{H}. \]

• III, IV
  
• II, III
  
• II, IV
  
• I, IV
  

11.

For the relation \( \Delta_r G = -nF E_\text{cell} \), \( E_\text{cell} = E^\circ_\text{cell} \), in which of the following conditions?

• \( Concentration of any one of the reacting species should be unity.\)
  
• \( Concentration of all the product species should be unity.\)
  
• \( Concentration of all the reactant and product species should be unity.\)
  
• \( Concentration of all reacting and product species should be unity.\)
  

12.

Specific conductance of \( 0.1 \, \text{M} \, \text{HNO}_3 \) is \( 6.3 \times 10^{-2} \, \text{ohm}^{-1} \, \text{cm}^{-1} \). The molar conductance of the solution is:

• \( 100 \, \text{ohm}^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \)
  
• \( 515 \, \text{ohm}^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \)
  
• \( 630 \, \text{ohm}^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \)
  
• \( 6300 \, \text{ohm}^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \)
  

13.

Which of the following represents the correct order of acidity in the given compounds?

• \( \text{FCH}_2\text{COOH}>\text{CH}_3\text{COOH}>\text{BrCH}_2\text{COOH}>\text{ClCH}_2\text{COOH} \)
  
• \( \text{BrCH}_2\text{COOH}>\text{ClCH}_2\text{COOH}>\text{FCH}_2\text{COOH}>\text{CH}_3\text{COOH} \)
  
• \( \text{FCH}_2\text{COOH}>\text{ClCH}_2\text{COOH}>\text{BrCH}_2\text{COOH}>\text{CH}_3\text{COOH} \)
  
• \( \text{CH}_3\text{COOH}>\text{BrCH}_2\text{COOH}>\text{ClCH}_2\text{COOH}>\text{FCH}_2\text{COOH} \)
  

14.

Element not showing variable oxidation state is:

• Bromine
  
• Iodine
  
• Chlorine
  
• Fluorine
  

15.

In \( \text{NO}_3^- \) ion, the number of bond pairs and lone pairs of electrons on the nitrogen atom are:

• \( 2, 2 \)
  
• \( 3, 1 \)
  
• \( 1, 3 \)
  
• \( 4, 0 \)