Coordination Compounds

Step 1: Understand the Concept of Magnetic Moment:
The magnetic moment for a transition metal complex can be calculated using the formula for spin-only magnetic moment: $ is the number of unpaired electrons in the complex. The spin-only magnetic moment is determined by the number of unpaired electrons, which depends on the metal's oxidation state and the nature of the ligands.

Step 2: Analyze Each Complex and Determine the Number of Unpaired Electrons:

• A) [CoF₆] ^3-: Cobalt in +3 oxidation state (Co³⁺) has 6 d-electrons (d⁶). In the octahedral complex with weak field ligands like fluoride (F^-), the electrons will be arranged with 3 unpaired electrons. Therefore, the number of unpaired electrons is 3.
• B) [Co(C₂O₄)₃] ^3-: Cobalt in +3 oxidation state (Co³⁺) has 6 d-electrons (d⁶). The oxalate ion (C₂O₄^2-) is a weak field ligand, so there are 2 unpaired electrons in this complex.
• C) [FeF₆] ^3-: Iron in +3 oxidation state (Fe³⁺) has 5 d-electrons (d⁵). With weak field fluoride ligands, Fe³⁺ has 5 unpaired electrons.
• D) [Mn(CN)₆] ^3-: Manganese in +3 oxidation state (Mn³⁺) has 4 d-electrons (d⁴). Cyanide (CN^-) is a strong field ligand, causing pairing of electrons, resulting in 1 unpaired electron.

Step 3: Calculate the Magnetic Moment:
- For complex A: With 3 unpaired electrons, the magnetic moment is: \) \mu = \sqrt{15} \mu = \sqrt{8} \mu = \sqrt{35} \mu = \sqrt{3}$ (matches with II)

Final Answer:
The correct matching is: A - V, B - II, C - IV, D - I

Polystyrene is a polymer formed by the addition polymerization of styrene monomers. It does not involve the elimination of small molecules like water, which is characteristic of condensation polymers. In contrast, Terylene, Nylon 6,6, and Bakelite are all examples of condensation polymers.

Let's analyze the given options:

Option 1: XeO₂ is a colourless explosive gas – This statement is incorrect. Xenon dioxide (XeO₂) is indeed an explosive compound, but it is not colourless; it has a yellowish hue. Hence, this statement is false.

Option 2: SO₂ is highly soluble in water – This is correct. Sulfur dioxide (SO₂) is highly soluble in water, where it forms sulfurous acid (H₂SO₃).

Option 3: Noble gases have very low boiling points – This is true. Noble gases like helium, neon, and argon have very low boiling points due to their monatomic and non-polar nature.

Option 4: The boiling point of sulfur is more than that of oxygen – This is true. The boiling point of sulfur is 444.6 K, whereas oxygen boils at 90.19 K. Thus, the statement in Option 1 is not correct.

Let's analyze the given statements:

Statement I: The order of the reaction is determined from experiment only.
This statement is correct. The order of a reaction cannot be predicted theoretically, and it must be determined experimentally based on reaction rates.
Statement II: The order of a reaction can be zero, a positive integer or a fraction.
This statement is also correct. The order of reaction can indeed be zero, a positive integer, or even a fraction, depending on the nature of the reaction.
Statement III: In a multistep reaction, the slow step determines the rate.
This statement is also true. In a multistep reaction, the slowest step, often referred to as the rate-determining step, governs the overall rate of the reaction.
Thus, all three statements are correct.

Step 1: Let the weight of chlorine in the compound be . The weight of AgCl is 0.1435 g, and the molar mass of AgCl is 143.5 g mol . Now, from the given data, we know that 0.0945 g of organic compound gives 0.1435 g of AgCl. The number of moles of AgCl formed is:

Step 2: Since the molar ratio of AgCl to chlorine is 1:1, we know that 1 mole of AgCl corresponds to 1 mole of chlorine. Therefore, the number of moles of chlorine is also 0.001 mol. Now, the mass of chlorine is:

Step 3: The percentage of chlorine by weight in the compound is: Thus, the percentage of chlorine in the organic compound is 37.6 %.

Step 1: Reaction of Platinum with Aqua Regia - The platinum metal reacts with a mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO ), known as aqua regia. - Aqua regia is a strong oxidizing agent and helps dissolve platinum, forming a platinum complex.

Step 2: Determining the Oxidation State of Pt - In the complex ion , platinum typically assumes an oxidation state of when it reacts with aqua regia. Hence, the oxidation state of Pt in is .