(11/11/24) CHEMICAL REACTIONS (Pg. 78 to 82 )

Q1. What react with an acid to give salt and water.

• a. Acid
• b. Base
• c. None
• d. Neutral substances

Q2. How will you obtain MgO from Mg.

• a. Burning the Mg wire in air
• b. Burning the Mg wire in the absence of air
• c. Keeping the Mg wire
• d. None of the above

Q3. What do you observe when silver nitrate solution is added to NaCl solution.

• a. Dirty green ppt
• b. Reddish brown ppt
• c. Curdy white ppt
• d. Pale blue ppt

Q4. What do you observe when iron nail is heated with copper sulphate solution

• a. Blue solution changes to black
• b. Blue solution changes to green
• c. Blue solution changes to red
• d. No change

Q5. What do you observe when phenolphthalein is added to an acidic solution ?

• a. Colourless to pink
• b. Colourless to yellow
• c. Colourless to green
• d. No change in colour