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Consider the following statements about ionic compounds:
1. They are formed by the transfer of electrons from a metal to a non-metal.
2. They have high melting and boiling points.
3. They are generally insoluble in water.
Which of the statements given above is/are correct?
Match List-I with List-II.
| List-I (Reaction) | List-II (Type of reaction) |
|---|---|
| A. Barium chloride with sodium sulphate | 1. Displacement |
| B. Calcium oxide with water | 2. Combination |
| C. Silver chloride kept in sunlight | 3. Double displacement |
| D. Iron nail in copper sulphate solution | 4. Decomposition |
Select the correct answer using the codes given below.
Consider the following statements:
1. Respiration is an endothermic process.
2. Decomposition reactions are generally endothermic.
3. Burning of natural gas is an exothermic reaction.
Which of the statements given above is/are correct?
Consider the following steps in whitewashing a wall:
A. Slaked lime reacts with carbon dioxide in the air
B. Calcium oxide is added to water
C. A shiny layer of calcium carbonate forms
D. Calcium hydroxide is obtained
Select the correct sequence of these steps.
Consider the following statements:
1. Loss of hydrogen is oxidation.
2. Gain of oxygen is reduction.
3. Oxidation and reduction occur together, so such reactions are called redox reactions.
Which of the statements given above is/are correct?
Consider the following statements about rancidity:
1. It is caused by the oxidation of fats and oils.
2. Antioxidants are added to food to prevent it.
3. Chips packets are filled with oxygen to prevent it.
Which of the statements given above is/are correct?
Consider the following statements:
1. The hydrogen molecule and methane are formed by sharing of electrons.
2. Covalent compounds are generally good conductors of electricity.
Which of the statements given above is/are correct?
Match List-I with List-II.
| List-I (Process) | List-II (Observation) |
|---|---|
| A. Burning of natural gas | 1. Blue colour of the solution fades |
| B. Silver chloride kept in sunlight | 2. Reddish-brown coating forms |
| C. Iron nail in copper sulphate solution | 3. Heat is given out |
| D. Rusting of iron | 4. White solid turns grey |
Select the correct answer using the codes given below.
Consider the following statements about double displacement reactions:
1. In a double displacement reaction, two compounds exchange their ions.
2. Barium chloride and sodium sulphate react to form an insoluble precipitate of barium sulphate.
3. In the reaction between barium chloride and sodium sulphate, sodium chloride is the insoluble precipitate.
Which of the statements given above is/are correct?
Consider the following statements about silver chloride:
1. White silver chloride turns grey when kept in sunlight.
2. In sunlight, silver chloride breaks down into silver and chlorine.
3. The change of silver chloride in sunlight is a combination reaction.
Which of the statements given above is/are correct?
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