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201.

The alkali metal that reacts with nitrogen directly to form nitride isA. LiB. NaC. KD. Rb.

Answer» Correct Answer - A
Li is the only alkali which reacts directly with `N_(2)`
`6Li + N_(2) rarr2Li_(3)N`
Discussion
202.

When sodium reacts with excess of oxygen, oxidation number of oxygen changes fromA. `0-1`B. `0-2`C. `-1` to `-2`D. `+1` to `-1`.

Answer» Correct Answer - A
`2Na+O_(2)rarrNa_(2)O_(2)`
Oxidation number of oxygen is 0 in `O_(2)` and `-1` in `Na_(2)O_(2)`.
Discussion
203.

Aqueous NaCl solution is electrolyzed using platinum electodes. What is the product formed at cathode?A. NaB. `H_(2)`C. `O_(2)`D. `Cl_(2)`

Answer» Correct Answer - B
On electrolysis of NaCl with Pt electrodes `H_(2)` is formed at cathode (-ve electrode).
Discussion
204.

Alkali metals displace hydrogen from water forming bases due to the reason thatA. They are far above the hydrogen in electrochemical series based on oxidation potentialB. They are far below the hydrogen in electrochemical series based on oxidation potentialC. Their ionization potential is less than that of other elementsD. They contain only one electron in their outermost shell.

Answer» Correct Answer - B
Alkali metals are below hydrogen in the electrochemical series based on oxidation potential (in series based on reduction potential, alkali metals are above hydrogen).
Discussion
205.

Fires, that result from the combustion of alkali metals can be extinguished byA. `C Cl_(4)`B. SandC. WaterD. Kerosene

Answer» Correct Answer - A
Fires due to alkali metals can be extinguished by `C Cl_(4)`.
Discussion
206.

The alkali metal that reacts with nitrogen directly to form nitride isA. NaB. KC. PbD. Li.

Answer» Correct Answer - D
Lithium is the only alkali metal that reacts with nitrogen to form nitride.
Discussion
207.

What are the products formed when `Li_(2)CO_(3)` undergoes decomposition?A. `Li_(2)O_(2) + CO`B. `Li_(2)O + CO`C. `Li_(2)O + CO_(2)`D. `LiO_(2) + CO`.

Answer» Correct Answer - C
`Li_(2)CO_(3)overset(Delta)rarrLi_(2)O+CO_(2)uarr`
Discussion
208.

Aqueous sodium hydroxide reacts with white phosphorus to form phosphine andA. `NaH_(2)PO_(2)`B. `P_(2)O_(5)`C. `Na_(3)PO_(3)`D. `P_(2)O_(3)`

Answer» Correct Answer - A
`3NaOH + P_(4) + 3H_(2)Orarr3NaH_(2)PO_(2)+PH_(3)`.
Discussion