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Quiz

Lesson 1: Qualitative Analysis of Acidic Radicals (Anions) — Picture questions (exam style)

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  • Questions count: 4
  • Passing grade: 60%
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1.
Acid X is used to test for the anion of acid Y in its salts (figure). The anions of X and Y are:
Acid X is used to test for the anion of acid Y in its salts (figure). The anions of X and Y are:
anion of X: Cl− – anion of Y: CO₃2−
anion of X: SO₄2− – anion of Y: I−
anion of X: Cl− – anion of Y: NO₂−
anion of X: SO₄2− – anion of Y: NO₃−
2.
A 2.5 g mixture of Na₂CO₃ and NaCl is treated with excess HCl; only Na₂CO₃ gives CO₂ (STP). Which option is consistent? (Na₂CO₃ = 106)
A 2.5 g mixture of Na₂CO₃ and NaCl is treated with excess HCl; only Na₂CO₃ gives CO₂ (STP). Which option is consistent? (Na₂CO₃ = 106)
volume of CO₂ = 0.132 L, Na₂CO₃ in the mixture = 25%
volume of CO₂ = 0.066 L, Na₂CO₃ in the mixture = 25%
volume of CO₂ = 0.066 L, Na₂CO₃ in the mixture = 75%
volume of CO₂ = 0.264 L, Na₂CO₃ in the mixture = 25%
3.
What is observed in the preliminary test shown for the anion I−?
What is observed in the preliminary test shown for the anion I⁻?
with conc. H₂SO₄: violet fumes turning starch paper blue
with conc. H₂SO₄: orange-red fumes
no reaction with dilute HCl
effervescence; gas turns limewater milky
4.
Excess HCl is added to 5.0 g of Na₂S as shown. What volume of H₂S (STP) is given off?
Excess HCl is added to 5.0 g of Na₂S as shown. What volume of H₂S (STP) is given off?
1.44 L
2.87 L
1.54 L
3.29 L
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