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Lesson 2 – Chemical Analysis and Qualitative Separation of Anions and Cations — 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: NO₂−
anion of X: I− – anion of Y: SO₄2−
anion of X: SO₄2− – anion of Y: NO₃−
anion of X: SO₄2− – anion of Y: I−
2.
A 16 g mixture of Na₂CO₃ and NaCl is treated with excess HCl; only Na₂CO₃ gives CO₂ (STP). Which option is consistent? (Na₂CO₃ = 106)
A 16 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 = 2.54 L, Na₂CO₃ in the mixture = 75%
volume of CO₂ = 2.54 L, Na₂CO₃ in the mixture = 25%
volume of CO₂ = 5.07 L, Na₂CO₃ in the mixture = 75%
volume of CO₂ = 2.54 L, Na₂CO₃ in the mixture = 90%
3.
Excess HCl is added to 1.56 g of Na₂CO₃ as shown. What volume of CO₂ (STP) is given off?
Excess HCl is added to 1.56 g of Na₂CO₃ as shown. What volume of CO₂ (STP) is given off?
0.659 L
0.794 L
0.330 L
0.353 L
4.
What is observed in the preliminary test shown for the anion NO₃−?
What is observed in the preliminary test shown for the anion NO₃⁻?
no reaction with acids
with conc. H₂SO₄ and Cu turnings: red-brown fumes
pungent gas turning acidified dichromate paper green
effervescence; gas turns limewater milky
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