The true statement among the given options is: "Burning of magnesium in air is an example of combination reaction."

Here's why:

1. "Water changing to ice is an example of chemical change." - This statement is false. Water changing to ice is a physical change, not a chemical change. The water molecules are not chemically altered during this process.

2. "You always need a catalyst to execute a chemical reaction." - This statement is also false. A catalyst can speed up a chemical reaction, but it is not always necessary for a reaction to occur.

3. "Burning of candle is an example of chemical change only." - This statement is false. Burning of a candle is both a physical and chemical change. The wax melting is a physical change, while the wax reacting with oxygen in the air to produce heat, light, water vapor, and carbon dioxide is a chemical change.

4. "Burning of magnesium in air is an example of combination reaction." - This statement is true. When magnesium burns, it reacts with the oxygen in the air to form magnesium oxide. This is a combination reaction because two substances (magnesium and oxygen) are combining to form a single product (magnesium oxide).

Question

The true statement among the given options is: "Burning of magnesium in air is an example of combination reaction."

Here's why:

1. "Water changing to ice is an example of chemical change." - This statement is false. Water changing to ice is a physical change, not a chemical change. The water molecules are not chemically altered during this process.

2. "You always need a catalyst to execute a chemical reaction." - This statement is also false. A catalyst can speed up a chemical reaction, but it is not always necessary for a reaction to occur.

3. "Burning of candle is an example of chemical change only." - This statement is false. Burning of a candle is both a physical and chemical change. The wax melting is a physical change, while the wax reacting with oxygen in the air to produce heat, light, water vapor, and carbon dioxide is a chemical change.

4. "Burning of magnesium in air is an example of combination reaction." - This statement is true. When magnesium burns, it reacts with the oxygen in the air to form magnesium oxide. This is a combination reaction because two substances (magnesium and oxygen) are combining to form a single product (magnesium oxide).

Knowee AI · Accepted Answer

The true statement among the given options is: "Burning of magnesium in air is an example of combination reaction."

Here's why:

1. "Water changing to ice is an example of chemical change." - This statement is false. Water changing to ice is a physical change, not a chemical change. The water molecules are not chemically altered during this process.

2. "You always need a catalyst to execute a chemical reaction." - This statement is also false. A catalyst can speed up a chemical reaction, but it is not always necessary for a reaction to occur.

3. "Burning of candle is an example of chemical change only." - This statement is false. Burning of a candle is both a physical and chemical change. The wax melting is a physical change, while the wax reacting with oxygen in the air to produce heat, light, water vapor, and carbon dioxide is a chemical change.

4. "Burning of magnesium in air is an example of combination reaction." - This statement is true. When magnesium burns, it reacts with the oxygen in the air to form magnesium oxide. This is a combination reaction because two substances (magnesium and oxygen) are combining to form a single product (magnesium oxide).

Which of the following statement is true?Water changing to ice is an example of chemical change.You always need a catalyst to execute a chemical reaction.Burning of candle is an example of chemical change only.Burning of magnesium in air is an example of combination reaction.

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