Chemistry Test 16

Result

Chemistry Test 16

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

The correct order of acidic strength is -

A
Cl₂O₇ > SO₂ > P₄O₁₀

B
CO₂ > N₂O₅ > SO₃

C
Na₂O > MgO > Al₂O₃

D
K₂O > CaO > MgO

Solution

High the electro negativity of element higher the acidic strength of oxides.
Question 2
4 / -1

A sol has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for co-agulation–

A
NaCl

B
K₄[Fe(CN)₆]

C
ZnCl₂

D
Na₂SO₄

Solution

Higher the coagulatating power of ion due to higher valency so decreases the concentration for ion.
Fe(CN)₆)^–4 has lowest concentration for co-agulation.
Question 3
4 / -1

At 80 °C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 °C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

A
48 mol percent

B
50 mol percent

C
52 mol percent

D
34 mol percent

Solution

x_A × 520 + (1 – x_A)1000 = 760
⇒ 520x_A + 1000 – 1000x_A = 760
⇒ 480 x_A = 240

x_A=1/2

Mole percent of A is 50 mol percent.