Chemistry
The table given below shows the reaction of a few elements with acids and bases to evolve hydrogen gas.
| Element | Acid | Base |
|---|---|---|
| (A) | X | X |
| (B) | ✓ | ✓ |
| (C) | ✓ | X |
| (D) | ✓ | ✓ |
Which of these elements will form amphoteric oxides.
- A and D
- B and D
- A and C
- B and D
Hydrogen
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Answer
B and D
Reason — In the above table, elements (B) and (D), when reacted with both acid and base, evolve hydrogen gas. So, they will form amphoteric oxides.
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Related Questions
Which of the following statements about the reaction given below are incorrect?
ZnO (s) + C (s) ⟶ Zn (s) + CO
P — Zinc is getting reduced.
Q — Carbon is getting oxidised.
R — Carbon monoxide is getting oxidised.
S — Zinc oxide is getting reduced.
- P and Q
- P and R
- P, Q and R
- All are incorrect
Zinc metal can react with which of the following options under appropriate conditions to produce hydrogen?
P — Steam
Q — Dilute acid
R — Strong alkalies
- Only P
- Q and R
- R and P
- All of these
Assertion (A): Though hydrogen is lighter than air, it is not collected by the downward displacement of air but by the downward displacement of water.
Reason (R): Hydrogen is slightly soluble in water.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Hydrogen and alkali metals react with a black copper oxide to give red/brown copper.
Reason (R): Hydrogen and alkali metals are good oxidising agents.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.