What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?
1. A permanent white precipitate is formed immediately
2. No change at first but a white precipitate is formed on standing
3. A white precipitate is formed which later dissolves
4. A green precipitate which turns red on standing in air
Hypo is chemically:
1. Na2S2O3.2H2O
2. Na2S2O3.3H2O
3. Na2S2O3.4H2O
4. Na2S2O3.5H2O
If NaOH is added to an aqueous solution of Zn2+ ions, a white precipitate appears and on adding axcess NaOH, the precepitate dissolves. In this solution zinc exists in the:
1. cationic part
2. anionic part
3. both in cationic and anionic parts
4. there is no zinc left in the solution
Soda lime is:
1. Na2CO3 + CaO
2. NaOH + NaHCO3
3. NaOH + CaO
4. NaH + Na2CO3
Molecular formula of Glauber's salt is :
1. MgSO47H2O
2. CuSO45H2O
3. FeSO47H2O
4. Na2SO410H2O
Among the following, which has minimum solubility in water?
1. KOH
2. CsOH
3. LiOH
4. RbOH
Caustic soda is:
1. Efflorescent
2. Deliquescent
3. Hygroscopic
4. Oxidant
Pearl ash and caustic potash are chemically:
1. K2CO3 and KOH
2. KOH and K2CO3
3. Na2CO3 and KOH
4. Na2CO3 and NaOH
The products of the electrolysis of aqueous solution of common salt are:
1. Na + Cl2
2. H2 + O2
3. NaOH + H2 + Cl2
4. NaOH + Cl2 + O2
Tin dissolves in boiling caustic soda solution because of the formation of soluble:
1. Sn(OH)2
2. Sn(OH)4
3. Na2SnO3
4. none of these