Acids, Bases and Salts NDA Questions

NDA Chemistry

Acids, Bases and Salts MCQ Questions


7.
Aqua regia, used to dissolve noble metals like gold and platinum, is a mixture of:
A.
Concentrated HCl and HF in ratio 1:1
B.
Concentrated H₂SO₄ and HNO₃ in ratio 1:1
C.
Dilute HNO₃ and dilute H₂SO₄ in ratio 3:1
D.
Concentrated HNO₃ and concentrated HCl in the ratio 1:3 (by volume)
😑 View Answer Rough Work Error
ANSWER :
D. Concentrated HNO₃ and concentrated HCl in the ratio 1:3 (by volume)
8.
Which of the following is the correct reaction of HCl with sodium hydroxide?
A.
HCl + NaOH → NaCl + H₂↑
B.
HCl + NaOH → NaCl + H₂O (neutralisation reaction)
C.
2HCl + NaOH → NaCl₂ + H₂O
D.
HCl + NaOH → Na + Cl + H₂O
😑 View Answer Rough Work Error
ANSWER :
B. HCl + NaOH → NaCl + H₂O (neutralisation reaction)
9.
Bases that are soluble in water are called:
A.
Salts
B.
Alkalis
C.
Amphoteric substances
D.
Acids
😑 View Answer Rough Work Error
ANSWER :
B. Alkalis
10.
When sodium hydroxide reacts with zinc metal, what products are formed?
A.
Zinc hydroxide and sodium
B.
Zinc oxide and water
C.
ZnSO₄ and NaH
D.
Sodium zincate (Na₂ZnO₂) and hydrogen gas: 2NaOH + Zn → Na₂ZnO₂ + H₂↑
😑 View Answer Rough Work Error
ANSWER :
D. Sodium zincate (Na₂ZnO₂) and hydrogen gas: 2NaOH + Zn → Na₂ZnO₂ + H₂↑
11.
What happens when CO₂ gas is passed through NaOH solution?
A.
Sodium bicarbonate only forms always
B.
NaOH decomposes to Na and O₂
C.
Sodium carbonate (Na₂CO₃) is formed: 2NaOH + CO₂ → Na₂CO₃ + H₂O
D.
Sodium chloride forms
😑 View Answer Rough Work Error
ANSWER :
C. Sodium carbonate (Na₂CO₃) is formed: 2NaOH + CO₂ → Na₂CO₃ + H₂O
12.
The caustic nature of bases (their ability to corrode skin) is due to:
A.
Na⁺ ions in NaOH
B.
Carbon present in some bases
C.
H⁺ ions present in bases
D.
OH⁻ ions, which react with and denature proteins and saponify fats in skin tissue
😑 View Answer Rough Work Error
ANSWER :
D. OH⁻ ions, which react with and denature proteins and saponify fats in skin tissue