Equilibrium Test

Result

Equilibrium Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

What is the best description of the change that occurs when Na₂O(s) is dissolved in water?

A
Oxide ion donates a pair of electrons

B
Oxide ion accepts sharing in a pair of electrons.

C
Oxidation number of sodium decreases.

D
Oxidation number of oxygen increases.

Solution

In water Na₂O dissociates as -
Na₂O + H₂O → 2Na⁺ + O^2-
The oxide ion formed can form hydrgen bonds with water and is stabilised. Thus it is easy for Na₂O and all other oxides to dissolve in water as it brings about further stability in the system.
Question 2
1 / -0

Conjugate acid of a weak base is always stronger. What will be the decreasing order of basic strength of the following conjugate bases? OH^-, RO^-, CH₃COO^-, Cl^-

A
OH^- > R > CH₃CO >

B
RO⁻ > OH⁻ > CH₃COO⁻ > Cl⁻

C
CH₃COO⁻> Cl⁻ > RO⁻ > OH⁻

D
RO^-> OH^- > Cl^-> CH₃COO^-

Solution

conjugate acids of given bases are H₂O, ROH, CH₃COO^-, Cl^-
their acidic strength in the order
Cl^- > CH₃COO^- > H₂O > ROH
basic strength in the order RO⁻ > OH⁻ > CH3COO⁻ > Cl⁻