Redox Reactions(Chemistry ) Questions and answers for exam Preparation

Question 1. The elements in which the outermost electrons are in the same principal quantum shell form the

isotopes
periods
rows
Diatic bonds

Explanation:-

Answer: Option B. -> periods
Answer: (b).periods

Question 2. Hydrated Aluminum Chloride (AlCl₃) exists as

Al₂Cl₃
AlCl₃
Al₂Cl₆
AlCl₆

Explanation:-

Answer: Option B. -> AlCl₃
Answer: (b).AlCl₃

Question 3. Another product of the reaction SiO₂(s) + NaOH(l) → Na₂SiO₃(aq) would be

HO₃⁺
OH⁻
H₂O(l)
H₂(g)

Explanation:-

Answer: Option C. -> H₂O(l)
Answer: (c).H₂O(l)

Question 4. Oxygen has a higher electronegativity than

Silicon (Si)
Magnesium (Mg)
Chlorine (Cl)
all of above

Explanation:-

Answer: Option D. -> all of above
Answer: (d).all of above

Question 5. Consider the reaction: Al₂O₃+NaOH + H₂O (l) → NaAl(OH)₄ (aq). The moles of NaOH required to balance the equation are

1
2
3
4

Explanation:-

Answer: Option B. -> 2
Answer: (b).2

Question 6. The oxidation number of Argon upon reaction with oxygen is

0
+1
+2
+3

Explanation:-

Answer: Option A. -> 0
Answer: (a).0

Question 7. The oxidation number for oxygen will always be

2
−2
1
-1

Explanation:-

Answer: Option B. -> −2
Answer: (b).−2

Question 8. The formula Na₂O shows Na oxidation number to be

+1
+2
- 1
-2

Explanation:-

Answer: Option A. -> +1
Answer: (a).+1

Question 9. The ions containing sulfur and oxygen are called

sulphide
sulfates
sulphur dioxide
sulfuric acid

Explanation:-

Answer: Option B. -> sulfates
Answer: (b).sulfates

Question 10. The naming of compounds was given by German chemist

Alfred Stock
John
J.J Thomson
George Hallington

Explanation:-

Answer: Option A. -> Alfred Stock
Answer: (a).Alfred Stock