Related InterviewSolutions

• Among `KO_(2)`, `AlO_(2)^(-)`, `BaO_(2)` and `NO_(2)^(+)`, unpaired electrons is present inA. `NO_(2)^(+)` and `BaO_(2)`B. `KO_(2)` and `AlO_(2)^(-)`C. `KO_(2)` onlyD. `BaO_(2)` only.
• A combustible gas is liberated when caustic soda solution is heated withA. SB. `NH_(4)Cl`C. `I_(2)`D. Zn.
• A combustible gas is liberated when caustic soda solution is heated withA. `NH_(4)Cl`B. `I_(2)`C. ZnD. S.
• When a substance a reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substances D reacts with this solution of C . It also produce gas B on reaction with dilute sulphuric acid at room temperature . A imparts a deep golden yellow colour to the smokless flame of bunsen flame A,B , C and D are respectivelyA. Na, `H_(2)`, NaOH and ZnB. K, `H_(2)`, KOH and AlC. Ca, `H_(2)`, `Ca(OH)_(2)` and SnD. `CaC_(2), C_(2)H_(2)`, `Ca(OH)_(2)` and Fe.
• An aqueous solution of sodium sulphate is electrolysed using inert electrodes. The products at the cathode and anode are respectivelyA. `H_(2), O_(2)`B. `O_(2), H_(2)`C. `O_(2), Na`D. `O_(2), SO_(2)`.
• The metallic lustre exhibited by sodium is explained byA. Diffusion of sodium ionsB. Oscillation of loose electronsC. Excitation of free protonsD. Existence of body centred cubic lattice.
• Assertion (A) The reaction LiI + KF `rarr` LiF + KI proceed in the direction indicated. Reasons (A) Fluorine, being more reactive can easily replace iodine.
• Sodium peroxide which is yellow solid, when exposed to air becomes white due to the formation ofA. `H_(2)O_(2)`B. `Na_(2)O`C. `Na_(2)O + O_(3)`D. NaOH and `Na_(2)CO_(3)`
• Which of the following carbonates is least soluble in water ?A. `CaCO_(3)`B. `NaHCO_(3)`C. `Na_(2)SO_(4)`D. `KHCO_(3)`.
• Which one of the alkali metals forms only the normal oxide, `M_(2)O`, on heating in air ?A. KB. LiC. NaD. Rb.