Aldehydes Ketones And Carboxylic Acids

The given oxide formula is . Let the amount of metal M present as be and the amount of metal M present as be . The total number of metal atoms in the oxide is , so: The charge balance equation for the oxide is: Now, solve the system of equations: 1. 2. From equation (1), solve for : Substitute this into equation (2): So, the percentage of in the oxide is:

Thus, the correct answer is (B): .

Potassium (K) forms several oxides, but does not exist due to the instability of such an oxide. The common oxides of potassium are:
(Potassium oxide)
(Potassium superoxide)
(Potassium peroxide)
These oxides are stable under normal conditions. , on the other hand, is not stable and does not exist. This is due to the fact that potassium typically forms compounds with an oxidation state of +1 or +2, and an oxide like would require a higher oxidation state, which is not stable for potassium. Thus, the oxide of potassium that does not exist is .

The correct option is (A):

The reaction described in the question involves a Lewis acid that reacts with LiAlH_4 to give a highly toxic gas. The gas in question is diborane ( ), which is a highly toxic and volatile compound. When diborane reacts with ammonia ( ), it forms a compound commonly known as inorganic benzene. This compound is known as borazine, , which has a structure similar to benzene, but with alternating boron and nitrogen atoms. Thus, the gas that reacts with NH_3 to form inorganic benzene is .

The correct option is(C):