Correct Answer: A. lather readily with hard water

Explanation

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Explanation

(a) Gay - Lussac Law of combining volumes states that when gases react, they do so in volumes which are in simple ratios to one another and to the volume of the product, if gaseous, provided that the temperature and pressure remain constant.

(b) 2H\(_2\) + O\(_2\) -> 2H\(_2\)O. According to the equation, 2 volume of H\(_2\) requires 1 volume of oxygen.

50cm\(^3\) of H\(_2\) requires 25cm\(^3\) of oxygen,

volume of oxygen available = 30cm\(^3\),

volume of unused oxygen 30 - 25 = 5cm\(^3\).

Correct Answer: A.+900j

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Correct Answer: A. low temperatures

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Correct Answer: B. Charles

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Correct Answer: B) electrolysis of brine

Explanation

Chlorine is produced commercially by theelectrolysis of brine, which is a correct option in this question. Brine is a solution of sodium chloride (NaCl) in water.

During the electrolysis process, an electric current is passed through the brine solution. This causes the sodium chloride to break down into its constituent elements, sodium (Na) and chlorine (Cl₂). The chemical reactions that take place at the electrodes are as follows:

At the anode (positive electrode):

\[ 2Cl^- \rightarrow Cl_2(g) + 2e^- \]

At the cathode (negative electrode):

\[ 2Na^+ + 2e^- \rightarrow 2Na (s) \]

The reaction at the anode releases chlorine gas, while the reaction at the cathode produces sodium metal. In commercial production, the sodium metal reacts with water to form sodium hydroxide (NaOH), which is another useful industrial chemical.

It is important to note that other methods for producing chlorine exist, but electrolysis of brine is the most common and efficient method used in the industry.

Correct Answer: B) dilute hydrochloric acid

Explanation

The mixture === FeS

When dissolved in diluted HCl

FeS + 2HCl \(\rightarrow\) FeCl?+ H?S(g)

Both elements are separated making option (B) valid

Correct Answer: B)

800cm\(^3\)

Explanation

To answer this question, we need to use Boyle's Law. Boyle's Law states that the product of the pressure and volume of a given amount of gas is constant, as long as the temperature remains the same. Mathematically, this can be expressed as:

\(P_1V_1 = P_2V_2\)

Where \(P_1\) and \(V_1\) are the initial pressure and volume of the gas, and \(P_2\) and \(V_2\) are the final pressure and volume of the gas.

In this case, the initial pressure (\(P_1\)) is 400 mmHg, the initial volume (\(V_1\)) is 300 cm

Correct Answer: D. substitution

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Correct Answer: B. Seawater

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