Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

1. 2.
3. 4.
Subtopic:  Identification of Primary, Secondary & Tertiary Amines |
 81%
Level 1: 80%+
NEET - 2021
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In the light of the below statements, choose the correct answer from the options given below:
Statement I: Acid strength increases in the order given as HF < HCl < HBr < HI.
Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCI, HBr, and HI decreases and so the acid strength increases.
 
1. Statement I is correct and Statement II is incorrect
2. Statement I is incorrect and Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic:  Group 17 - Preparation, Properties & Uses |
 82%
Level 1: 80%+
NEET - 2021
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The pKb of dimethylamine and pka of acetic acid are 3.27 and 4.77 respectively at T (K).
The correct option for the pH of dimethylammonium acetate solution is:

1. 7.75 2. 6.25
3. 8.50 4. 5.50
Subtopic:  Salt Hydrolysis & Titration |
 67%
Level 2: 60%+
NEET - 2021
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The molar conductance of NaCl, HCI, and CH3COONa at infinite dilution are 126.45, 426.16, and 91.0 S cm mol–1 respectively. The molar conductance of CH3COOH at infinite dilution will be:

1. 698.28 S cm2 mol–1 2. 540.48 S cm2 mol–1
3. 201.28 S cm2 mol–1 4. 390.71 S cm2 mol–1
Subtopic:   Kohlrausch Law & Cell Constant |
 85%
Level 1: 80%+
NEET - 2021
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The right option for the statement "Tyndall effect is exhibited by", is:

1. Starch solution 

2. Urea solution

3. NaCl solution

4. Glucose solution

Subtopic:  Colloidal Solution |
 65%
Level 2: 60%+
NEET - 2021
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The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

1. 2

2. 3

3. 7

4. 5

Subtopic:  Introduction & Crystal System |
 53%
Level 3: 35%-60%
NEET - 2021
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Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures:

1.
2.
3.
4.
Subtopic:  Gas Laws |
 74%
Level 2: 60%+
NEET - 2021
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The incorrect statement among the following is:

1. Lanthanoids are good conductors of heat and electricity.
2. Actinoids are highly reactive metals, especially when finely divided.
3. Actinoid contraction is greater for element to element than Lanthanoid contraction.
4. Most of the trivalent Lanthanoid ions are colourless in the solid-state.
Subtopic:  f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
 62%
Level 2: 60%+
NEET - 2021
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Choose the incorrect statement among the following regarding noble gases:

1. Noble gases have weak dispersion forces.
2. Noble gases have large positive values of electron gain enthalpy.
3. Noble gases are sparingly soluble in water.
4. Noble gases have very high melting and boiling points.

Subtopic:  Group 18 - Preparation, Properties & Uses |
 61%
Level 2: 60%+
NEET - 2021
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For a reaction A→B, enthalpy of reaction is -4.2 kJ mol-1 and enthalpy of activation is 9.6 kJ mol-1. The correct potential energy profile for the reaction is:

1. 2.
3. 4.
Subtopic:  Arrhenius Equation |
 75%
Level 2: 60%+
NEET - 2021
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