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Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substances like SnCl2, formaldehyde, phenyl hydrazine, etc.
2AuCl3 ​ + 3SnCl2 ​ → 3SnCl4​ + 2Ausol ​
The above method is an example of
  • a)
    Reduction method
  • b)
    Oxidation method
  • c)
    Hydrolysis method
  • d)
    Double decomposition method
Correct answer is option 'A'. Can you explain this answer?
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Colloidal solutions of metals like gold can be prepared when their sal...
Salt solution of gold is being reduced to gold by using a reducing agent like SnCl2.
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Colloidal solutions of metals like gold can be prepared when their sal...
The reaction between 2AuCl3 (gold chloride) and 3SnCl2 (tin chloride) can be used to prepare a colloidal solution of gold.

When these two substances are mixed together, a redox reaction occurs. Tin(II) chloride (SnCl2) acts as a reducing agent, while gold(III) chloride (AuCl3) acts as an oxidizing agent. The tin(II) chloride reduces the gold(III) chloride to elemental gold (Au), while it itself gets oxidized to tin(IV) chloride (SnCl4).

The overall reaction can be represented as follows:

2AuCl3 + 3SnCl2 -> 2Au + 3SnCl4

The gold formed in this reaction exists as small particles or clusters in the solution, resulting in a colloidal solution of gold. These gold particles have a characteristic red color, giving the solution a reddish hue.

Other substances like formaldehyde or phenyl hydrazine can also be used in the preparation of colloidal gold solutions. These substances act as reducing agents and help in the reduction of gold ions to form colloidal gold particles.
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Read the passage given below and answer the following questions:Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interspersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state; this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols. Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the oceanQ. The particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. This statement explains

Read the passage given below and answer the following questions:Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interspersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state; this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols. Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the oceanQ. When Van der Waals forces are greater than forces due to the surface charge on the particles,

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Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substances like SnCl2, formaldehyde, phenyl hydrazine, etc.2AuCl3 + 3SnCl2 → 3SnCl4 + 2Ausol The above method is an example ofa)Reduction methodb)Oxidation methodc)Hydrolysis methodd)Double decomposition methodCorrect answer is option 'A'. Can you explain this answer?
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