Element with Z = 114 (Flerovium) belongs to Group 14 (Carbon family) with the outer electronic configuration ns2 np2.
Q3mcq
For a given reaction, ΔH = 35.5 kJ mol⁻¹ and ΔS = 83.6 JK⁻¹ mol⁻¹. The reaction is spontaneous at: (Assume that ΔH and ΔS do not vary with temperature)
a.
T > 425 K
Correct Answer
b.
All temperatures
c.
T > 298 K
d.
T < 425 K
Step-by-Step AI Explanation
Verified Method
For spontaneity, ΔG = ΔH - TΔS < 0. Thus, T > ΔH/ΔS. T > (35500 J/mol) / (83.6 J/K mol) ≈ 424.6 K, which rounds to T > 425 K.
Q5mcq
Which of the following is dependent on temperature?
a.
Molarity
Correct Answer
b.
Mole fraction
c.
Weight percentage
d.
Molality
Step-by-Step AI Explanation
Verified Method
Molarity is defined as moles of solute per liter of solution. Since volume changes with temperature, molarity is temperature-dependent.
Q5mcq
Which of the following is dependent on temperature?
a.
Molarity
Correct Answer
b.
Mole fraction
c.
Weight percentage
d.
Molality
Step-by-Step AI Explanation
Verified Method
Molarity is defined as moles of solute per liter of solution. Since volume changes with temperature, molarity is temperature-dependent.
Q6mcq
With respect to the conformers of ethane, which of the following statements is true?
a.
Bond angle changes but bond length remains same
b.
Both bond angle and bond length change
c.
Both bond angles and bond length remains same
Correct Answer
d.
Bond angle remains same but bond length changes
Step-by-Step AI Explanation
Verified Method
In ethane conformations, only the dihedral angle changes; bond angles and bond lengths remain constant.
Q6mcq
With respect to the conformers of ethane, which of the following statements is true?
a.
Bond angle changes but bond length remains same
b.
Both bond angle and bond length change
c.
Both bond angles and bond length remains same
Correct Answer
d.
Bond angle remains same but bond length changes
Step-by-Step AI Explanation
Verified Method
Conformations of ethane involve rotation about the C-C bond; this changes the dihedral angle, but the internal bond angles and bond lengths of the molecule remain unchanged.
Q7mcq
Name the gas that can readily decolourise acidified KMnO4 solution:
a.
SO2
Correct Answer
b.
NO2
c.
P2O5
d.
CO2
Step-by-Step AI Explanation
Verified Method
SO2 acts as a reducing agent and readily reduces purple acidified KMnO4 to colourless Mn2+ ions.
Q7mcq
Name the gas that can readily decolourise acidified KMnO4 solution:
a.
SO2
Correct Answer
b.
NO2
c.
P2O5
d.
CO2
Step-by-Step AI Explanation
Verified Method
Sulfur dioxide (SO2) acts as a reducing agent and readily reduces the purple-colored permanganate ion (MnO4-) to the colorless Mn2+ ion.
Q8mcq
It is because of inability of ns2 electrons of the valence shell to participate in bonding that
a.
Sn2+ is oxidising while Pb4+ is reducing
b.
Sn2+ and Pb2+ are both oxidising and reducing
c.
Sn4+ is reducing while Pb4+ is oxidising
d.
Sn2+ is reducing while Pb4+ is oxidising
Correct Answer
Step-by-Step AI Explanation
Verified Method
Due to the inert pair effect, the stability of the lower oxidation state increases down the group. Thus, Pb(IV) is reduced to Pb(II) (oxidising agent), while Sn(II) is oxidised to Sn(IV) (reducing agent).
Q9mcq
Mechanism of a hypothetical reaction X2 + Y2 -> 2XY is given below: (i) X2 -> X + X (fast), (ii) X + Y2 -> XY + Y (slow), (iii) X + Y -> XY (fast). The overall order of the reaction will be
a.
2
b.
0
c.
1.5
Correct Answer
d.
1
Step-by-Step AI Explanation
Verified Method
The rate is determined by the slow step (ii): Rate = k[X][Y2]. From equilibrium of step (i), [X]^2 = K[X2], so [X] = K^0.5 [X2]^0.5. Substituting this into the rate equation gives order 0.5 + 1 = 1.5.
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The equilibrium constants of the following are N2 + 3H2 <=> 2NH3 (K1), N2 + O2 <=> 2NO (K2), H2 + 1/2 O2 <=> H2O (K3). The equilibrium constant (K) of the reaction 2NH3 + 5/2 O2 <=> 2NO + 3H2O will be
a.
K2 * K3^3 / K1
b.
K2 * K3 / K1
c.
K1 * K3^3 / K2
d.
K1 * K3 / K2
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A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO. The volume of the container is decreased by moving a piston. The maximum volume of the container, when pressure of CO2 attains its maximum value (Kp = 1.6 atm) for the reaction SrCO3(s) <=> SrO(s) + CO2(g), will be
a.
10 litre
b.
4 litre
c.
2 litre
d.
5 litre
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In the electrochemical cell Zn|ZnSO4 (0.01M)||CuSO4 (1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E2. From the following, which one is the relationship between E1 and E2? (Given, RT/F = 0.059)
a.
E1 < E2
b.
E1 > E2
c.
E2 = 0 ≠ E1
d.
E1 = E2
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In the electrochemical cell Zn|ZnSO4(0.01M)||CuSO4(1.0 M)|Cu, the emf is E1. When the concentration of ZnSO4 is changed to 1.0 M and CuSO4 to 0.01 M, the emf changes to E2. What is the relationship between E1 and E2?
a.
E1 < E2
b.
E1 > E2
c.
E2 = 0 != E1
d.
E1 = E2
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The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes: CoCl3·6NH3, CoCl3·5NH3, CoCl3·4NH3 respectively is
a.
3 AgCl, 1 AgCl, 2 AgCl
b.
3 AgCl, 2 AgCl, 1 AgCl
c.
2 AgCl, 3 AgCl, 1 AgCl
d.
1 AgCl, 3 AgCl, 2 AgCl
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The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes : CoCl3⋅6NH3, CoCl3⋅5NH3, CoCl3⋅4NH3 respectively is
a.
3 AgCl, 1 AgCl, 2 AgCl
b.
3 AgCl, 2 AgCl, 1 AgCl
c.
2 AgCl, 3 AgCl, 1 AgCl
d.
1 AgCl, 3 AgCl, 2 AgCl
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