The most stable ion is : 
1. [Fe(OH)₅]^3- 
2. [FeCl₆]^3- 
3. [Fe(CN)₆]^3-  
4. [Fe(H₂O)₆]³⁺

 The functional groups present in zwitter ion are:

1. -NH₂ , -COOH 

2. -NH₂ , SO₃H 

3. Both (1) and (2) 

4. None of the above

An organic compound contains carbon, hydrogen and nitrogen in the mass ratio 9 : 1 : 3.5. If its molar mass is 108 g mol⁻¹, determine its molecular formula.

1. C₆H₈N₂ 

2. C₇H₁₀N 

3. C₅H₆N₃ 

4. C₄H₁₈N₃

Solubility of Ca(OH)₂ is s mol L^-1 . The solubility product (K_sp) under the same condition is : 

1. 4s³ 

2. 3s⁴

3. 4s² 

4. s³

Heat required to raise the temperature of 1 mole of a substance by 1^o C is called:

1. Specific heat 

2. Molar heat capacity 

3. Water equivalent 

4. Specific gravity 

In a mixture of A and B, components show negative deviations when:

For an aqueous solution, freezing point is -0.186^oC. Elevation of the boiling point of the same solution is:
(Given: K_f =1.86 K kg mol^-1  and K_b = 0.512 K kg mol^-1) 

1. 0.186

2. 0.0512

3. 1.86

4. 5.12

The bond angle of 109^o 28' is found in:

1. \(\text{NH}_3\)

2. \(\text {H}_2 \text{O}\)

3. \(\text{CH}_5^+\)

4. \(\text {NH}_4^+\)

Find out the order of a reaction \(A + 2B\rightarrow C\) , if the rate is given by \(+\frac{d[C]}{d t}=k[A][B]\): 

1. Three (3)

2. Two (2)

3. One (1)

4. Zero (0)

The species, among the following, that act as both Brönsted acid and base is/are:

1. \(H_2PO^-_2 \) 

2.  \(HPO^{2-}_3\)

3. \(HPO^{2-}_4\)

4. All of the above