Metal `M+"air" overset(delta)(to)Aoverset(H_(2)O)(to)Boverset(HCl)(to)` White fumes, Metal M can be:

Options

A. Li, Mg or AI
B. Li, AI or K
C. Na, K or Mg
D. Li, Na or K

Explanation

To solve the problem step by step, we need to analyze the reactions of metal M with air, water, and HCl, and identify which metals fit the criteria given in the question.

### Step 1: Identify the Reaction with Air
When metal M reacts with air (oxygen and nitrogen), it forms a compound A. Common metals that react with air include magnesium and aluminum.

**Hint:** Look for metals that form stable oxides or nitrides when heated in air.

### Step 2: Identify the Reaction with Water
Next, we need to consider what happens when this metal reacts with water. For example, magnesium reacts with water to form magnesium hydroxide and hydrogen gas.

**Hint:** Consider the reactivity of the metal with water; some metals react vigorously while others may react slowly or not at all.

### Step 3: Identify the Reaction with HCl
Finally, we need to see what happens when the metal reacts with hydrochloric acid (HCl). Magnesium, for example, reacts with HCl to produce magnesium chloride and hydrogen gas.

**Hint:** Metals that produce hydrogen gas upon reaction with acids are typically more reactive.

### Step 4: Analyze the Options
Now, we need to analyze the options provided. The question suggests that the metal can be magnesium or aluminum. Both of these metals fit the criteria outlined in the previous steps.

**Hint:** Check the reactivity series and the specific reactions of the metals with air, water, and acids to confirm your findings.

### Conclusion
Based on the analysis, the metal M can be magnesium or aluminum, as both of these metals react with air, water, and HCl to produce the expected compounds.

**Final Answer:** Metal M can be magnesium or aluminum.