[140923] CH X Chemistry

Which of the following is not a physical change?

• A

• B

• C

• D

In which of the following chemical equations do the abbreviations represent the correct states of reactants and products involved at reaction temperature?

• A

• B

• C

• D

Which one of the following processes involves a chemical reaction?

• A

• B

• C

• D

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4​ and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct ?

• A

• B

• C

• D

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

• A

• B

• C

• D

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

• A

• B

• C

• D

Which of the following gives the correct increasing order of acidic strength?

• A

• B

• C

• D

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?

• A

• B

• C

• D

Which of the following substance will not give CO2 on treatment with dilute acid?

• A

• B

• C

• D

Which of the following is suitable for dissolving gold?

• A

• B

• C

• D