A hollow sphere of volume \(V\) is floating on water surface with half immersed in it. What should be the minimum volume of water poured inside the sphere so that the sphere now sinks into the water?
1. \(\frac V2\)
2. \(\frac V3\)
3. \(\frac V4\)
4. \(V\)

Subtopic: Pressure |

53%

1

2

3

4

Please attempt this question first.

Hints

Q41:

Which one of the following sets of quantum numbers represents the highest energy level in an atom?
1. \(n=4,l=0,m=0,s=+\frac12\)
2. \(n=3,l=1,m=1,s=+\frac12\)
3. \(n=3,l=2,m=-2,s=+\frac12\)
4. \(n=3,l=0,m=0,s=+\frac12\)

Subtopic: Shell & Subshell |

72%

From NCERT

1

2

3

4

Please attempt this question first.

Hints

Please attempt this question first.

Q42:

\(CH_3COOH\xrightarrow{~~~Br_2/P~~~}~Y~\xrightarrow[(ii)~H_3O^+~~]{(i)~KCN}~X\)
Here, \(X\) is:
1. glycolic acid
2. a-hydroxy propionic acid
3. succinic acid
4. malonic acid

1

2

3

4

Please attempt this question first.

Hints

Q43:

Acetic anhydride is prepared in the laboratory by heating sodium acetate with:

1. Ethyl chloride
2. acetyl chloride
3. Cone. Hp0 4
4. zinc dust

60%

1

2

3

4

Please attempt this question first.

Hints

Q44:

For the homogeneous reaction,
\(4NH_3+5O_2~\rightleftharpoons~4NO+6H_2O\)
The equilibrium constant K, has the units:
1. Conc.⁺¹⁰
2. Conc.⁺¹
3. Conc.^-1
4. It is dimensionless

62%

1

2

3

4

Please attempt this question first.

Hints

Q45:

For the reaction,

\(NH_3+OCl^-~\longrightarrow~N_2H_4+Cl^-\)
Occurring in basic medium, the coefficient of N 2H4 in the balanced equation will be:

1. 1
2. 2
3. 3
4. 4

59%

1

2

3

4

Please attempt this question first.

Hints

Q46:

Which one of the following has a coordinate bond?

1. NH4Cl
2. AlCl3
3. NaCl
4. Cl2

66%

1

2

3

4

Please attempt this question first.

Hints

Q47:

Which of the following would exert maximum osmotic pressure?

1.	Decinormal aluminium sulphate
2.	Decinormal barium chloride
3.	Decinormal sodium chloride
4.	A solution obtained by mixing equal volumes of (2) and (3) and filtering