(25/10/24) Intro & Combination reaction

Q1. A reaction in which two or more substances combine to form a single substance is called __________ reaction.

• a. Combination
• b. Decompostion
• c. Displacement
• d. Double displacement

2. What happens in a chemical reaction ?

• BREAKING OF OLD BONDS
• FORMATION OF NEW BONDS
• BREAKING OF OLD BONDS & FORMATION OF NEW BONDS
• NONE

3. What do you observe when Mg ribbon is heated?

• Burns with yellow light
• Burns with white dazzling light
• Does not burn
• Burns with pop sound

3. The general reaction of a combination reaction : A + B ----->

• B + A
• AB + C
• AC
• AB

4. What do you observe when ammonia combines with HCl?

• DENSE YELLOW FUMES OF AMMONIUM CHLORIDE
• DENSE WHITE FUMES OF AMMONIUM CHLORIDE
• DENSE RED FUMES OF AMMONIUM CHLORIDE
• DENSE VIOLET FUMES OF AMMONIUM CHLORIDE