Reaction of Metals with Acid

Q. In a reaction between a metal and an acid, why are bubbles formed?

1. Formation of $O_2$ gas
2. Formation of $H_2$ gas
3. Formation of metal salt
4. None of the above

Q. Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the proper composition of Aqua-regia from the given options?

1. $1HCl+1HN{O}_3$
2. $1HN{O}_3+3HCl$
3. $1HCl+3HN{O}_3$
4. $1HN{O}_3+2HCl$

Q. A noble metal is one which is inert and does not react with acids like $HCl,HN{O}_3,H_{2}S{O}_4$. Select an option with a set of two noble metals.

1. Gold (Au); Platinum (Pt)
2. Gold (Au); Silver (Ag)
3. Silver (Ag); Platinum (Pt)
4. Gold (Au); Iron (Fe)

Q. Which of the following metals, in reaction with acids like HCl, do not form bubbles in the solution?

1. Gold (Au)
2. Aluminium (Al)
3. Iron (Fe)
4. Zinc (Zn)

Q. A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?​

Q.

Name the gas which burns with a pop sound.

__

Q. Metal reacts with nitric acid to form __________ and __________.

1. Salt and water
2. Salt and carbon dioxide gas
3. Salt and nitrogen oxide
4. Salt and nitrogen gas

Q.

All metals above hydrogen in activity series:

1. React with acids to liberate hydrogen ions.

2. React with acids to liberate hydrogen gas.

3. React with water at ordinary temperature.

4. React with acids to liberate oxygen gas.

Q.

Na + H₂O $\to$ Na₂O + H₂
In this reaction, what can you say about water?

1. Water is being reduced.

2. Water is acting as an acid.

3. Water is acting as an acid and it is being reduced.

4. Cannot be determined.

Q.

Metal + Acid → ? + ?

1. Salt + hydrogen

2. Salt + oxygen

3. Salt + nitrogen

4. Oxide + Hydrogen