Q 1 :

Which one of the following reactions does not belong to ''Lassaigne's test''?                [2025]
 

• $\text{Na}+X\underset{\mathit{\Delta }}{\mathit{\to }}\text{NaX}$

   

• $2\text{CuO}+\text{C}\underset{\Delta }{\to }2\text{Cu}+{\text{CO}}_2$

   

• $\text{Na}+\text{C}+\text{N}\underset{\Delta }{\to }\text{NaCN}$

   

• $2\text{Na}+\text{S}\underset{\Delta }{\to }{\text{Na}}_2\text{S}$

   

Q 2 :

Fehling’s solution ‘A’ is                 [2024]

• aqueous copper sulphate

   

• alkaline copper sulphate

   

• alkaline solution of sodium potassium tartrate (Rochelle’s salt)

   

• aqueous sodium citrate.

   

Q 3 :

In the following reaction, the product (A) is                    [2014]

Q 4 :

Given below are two statements:                                   [2022]

Statement I:   In the coagulation of a negative sol, the flocculating power of the three given ions is in the order:  ${\mathrm{Al}}^{3+}>{\mathrm{Ba}}^{2+}>{\mathrm{Na}}^{+}$

Statement II:   In the coagulation of a positive sol, the flocculating power of the three given salts is in the order: $\mathrm{NaCl}>{\mathrm{Na}}_2{\mathrm{SO}}_4>{\mathrm{Na}}_3{\mathrm{PO}}_4$

In the light of the above statements, choose the most appropriate answer from the options given below:

• Statement I is incorrect but Statement II is correct.

   

• Both Statement I and Statement II are correct.

   

• Both Statement I and Statement II are incorrect.

   

• Statement I is correct but Statement II is incorrect.