Which one of the following acts as a nucleophile?

1. 

2. 

3. 

4. 

 

During the estimation of nitrogen in the organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralised 10 mL of 1M H₂SO₄. Find out the percentage of nitrogen in the compound.

1. 14%
2. 28%
3. 56%
4. 68%

Which of the following compounds have highest melting point? 

1. Only I
2. Only II
3. I and II
4. II and III

Identify the major product ‘X’ obtained in the following reaction. 
2, 3-dimethyl butan-2-olX

Addition of water to alkynes occurs in an acidic medium and in the presence of H+ ions as a catalyst. Which of the following products will be formed on addition of water to but-1-yne under these conditions?

1. CH₃CH₂CH₂CHO
2. CH₃CH₂COCH₃
3. CH₃CH₂COOH + CO₂
4. CH₃COOH + HCHO

The correct order of increasing acidic strength is:

1. Phenol < ethanol < chloroacetic acid < acetic acid
2. Ethanol < phenol < chloroacetic acid < acetic acid
3. Ethanol < phenol < acetic acid < chloroacetic acid
4. chloroacetic acid < acetic acid < phenol < ethanol

KF has ccp structure. How many F^- ions and octahedral voids are there in this unit cell respectively?

1. 4 and 4
2. 4 and 8
3. 8 and 4
4. 6 and 6

The osmotic pressure of blood is 8.21atm at 37 °C. How much glucose would be used for an injection that is at the same osmotic pressure as blood?

1. 22.17 gL^-1
2. 58.14 gL^-1
3. 61.26 gL^-1
4. 75.43 gL^-1

At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is:

1. less than the rate of crystallization
2. greater than the rate of crystallization
3. Equal to the rate of crystallization
4. Zero

A chelating agent has two or more than two donor atoms to bind a single metal ion. Which of the following is not a chelating agent?

1. Thiosulphato
2. Glycinato
3. Oxalato
4. Ethane-1, 2-diamine