Law Of Chemical Equilibrium And Equilibrium Constant

To solve the problem, we need to identify which combination does not form a buffer solution.

1. Understanding Buffer Solutions:
A buffer solution resists changes in pH when small amounts of acid or base are added. Buffers are typically formed by:

• A weak acid and its salt with a strong base (e.g., CH₃COOH + CH₃COONa)
• A weak base and its salt with a strong acid (e.g., NH₃ + NH₄Cl)

The key is having a weak acid/base and its conjugate pair in proper proportions.

2. Analyze Each Option:

• Option 1: NH₃ + HCl (2:1 mole ratio)
  NH₃ is a weak base and HCl is a strong acid. At a 2:1 ratio, not all NH₃ reacts with HCl, so some NH₃ and NH₄⁺ (from NH₄Cl) remain — this forms a buffer.
• Option 2: CH₃COOH + NaOH (2:1 mole ratio)
  Excess CH₃COOH remains after partial neutralization by NaOH, forming CH₃COONa and CH₃COOH — a buffer system.
• Option 3: NaOH + CH₃COOH (1:1 mole ratio)
  NaOH completely neutralizes CH₃COOH to form only CH₃COONa. No weak acid (CH₃COOH) remains, so this is not a buffer.
• Option 4: NH₄Cl + NH₃ (1:1 mole ratio)
  This is a classic weak base (NH₃) and its salt (NH₄Cl) — it forms a buffer.

Final Answer:
The correct answer is NaOH + CH₃COOH (1:1 mole ratio) because it does not form a buffer solution.

To solve the problem, we need to find which option contains the same number of atoms as 6 g of H₂O.

1. Calculate Moles of H₂O:
Molar mass of water (H₂O) = 18 g/mol
Moles of water =

2. Calculate Number of Atoms in H₂O:
Each molecule of water contains 3 atoms (2 Hydrogen + 1 Oxygen).
So, total atoms =
= atoms

3. Find Which Option Has the Same Number of Atoms:

• 1 g H₂: Molar mass = 2 g/mol
  Moles = mol
  Each H₂ molecule has 2 atoms
  Atoms =
• 0.4 g He: Molar mass = 4 g/mol → 0.1 mol → = fewer atoms
• 22 g CO₂: Molar mass = 44 g/mol → 0.5 mol
  Each CO₂ has 3 atoms → = atoms
• 12 g CO: Molar mass = 28 g/mol → mol
  Each CO has 2 atoms → atoms

Final Answer:
The option with the same number of atoms as in 6 g of water is 1 g H₂.

Both BeH and MgH are known to form polymeric structures. BeH can adopt a linear polymeric structure due to bridging hydrogen atoms, while MgH forms polymeric networks in its crystal lattice.

Step 1: For the equilibrium reaction to have , the relationship between pressure and concentration should be the same. This happens only when the total number of moles of reactants and products on both sides of the equation are equal, i.e., no change in volume.

Step 2: Consider the reaction: In this case, the number of moles of reactants is , and the number of moles of products is also 2. This results in the equality of and , as the mole ratio of reactants and products is equal.

Step 3: Thus, the correct reaction for which is: