Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
a.
Noble gases are sparingly soluble in water.
b.
Noble gases have very high melting and boiling points.
Correct Answer
c.
Noble gases have weak dispersion forces.
d.
Noble gases have large positive values of electron gain enthalpy.
Step-by-Step AI Explanation
Verified Method
Noble gases have very low melting and boiling points due to weak London dispersion forces.
Q52mcq
The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is:
a.
7
b.
5
c.
2
d.
3
Correct Answer
Step-by-Step AI Explanation
Verified Method
There are 3 types of body-centered unit cells in the 14 Bravais lattices: cubic, tetragonal, and orthorhombic.
Q53mcq
Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?
a.
Cp / Cv = R
b.
Cp - Cv = R
Correct Answer
c.
Cp = R * Cv
d.
Cv = R * Cp
Step-by-Step AI Explanation
Verified Method
For one mole of an ideal gas, the Mayer's relation is Cp - Cv = R.
Q54mcq
Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of :
a.
belonging to same group
b.
diagonal relationship
c.
lanthanoid contraction
Correct Answer
d.
having similar chemical properties
Step-by-Step AI Explanation
Verified Method
Zr and Hf belong to the same group but possess similar radii due to the lanthanoid contraction, which offsets the expected increase in size down the group.
Q54mcq
Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of:
a.
belonging to same group
b.
diagonal relationship
c.
lanthanoid contraction
Correct Answer
d.
having similar chemical properties
Step-by-Step AI Explanation
Verified Method
The similarity in radii between 4d and 5d transition elements like Zr and Hf is due to the lanthanoid contraction.
Q55mcq
The maximum temperature that can be achieved in blast furnace is :
a.
upto 1200 K
b.
upto 2200 K
Correct Answer
c.
upto 1900 K
d.
upto 5000 K
Step-by-Step AI Explanation
Verified Method
In a blast furnace, temperatures reach up to approximately 2200 K in the combustion zone near the tuyeres.
Q56mcq
Statement I: Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.
a.
Both Statement I and Statement II are true.
Correct Answer
b.
Both Statement I and Statement II are false.
c.
Statement I is correct but Statement II is false.
d.
Statement I is incorrect but Statement II is true.
Step-by-Step AI Explanation
Verified Method
Acid strength in hydrohalic acids increases with bond length and decreasing bond dissociation enthalpy, which follows the size trend of the halogen atom.
Q56mcq
Statement I: Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
a.
Both Statement I and Statement II are true.
Correct Answer
b.
Both Statement I and Statement II are false.
c.
Statement I is correct but Statement II is false.
d.
Statement I is incorrect but Statement II is true.
Step-by-Step AI Explanation
Verified Method
Acid strength in hydrohalic acids depends on H-X bond dissociation energy. As size increases, bond length increases, bond strength decreases, and acid strength increases.
Q57mcq
The compound which shows metamerism is :
a.
C5H12
b.
C3H8O
c.
C3H6O
d.
C4H10O
Correct Answer
Step-by-Step AI Explanation
Verified Method
Metamerism requires a polyvalent functional group attached to different alkyl chains. C4H10O (diethyl ether vs. methyl propyl ether) exhibits metamerism.
Q59mcq
The right option for the statement “Tyndall effect is exhibited by” is :
a.
NaCl solution
b.
Glucose solution
c.
Starch solution
Correct Answer
d.
Urea solution
Step-by-Step AI Explanation
Verified Method
Tyndall effect is exhibited by colloidal solutions. Starch forms a colloidal solution in water, whereas NaCl, glucose, and urea form true solutions.
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An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]
a.
CH
b.
CH2
c.
CH3
d.
CH4
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The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol-1 respectively. The molar conductance of CH3COOH at infinite dilution is.
a.
201.28 S cm2 mol-1
b.
390.71 S cm2 mol-1
c.
698.28 S cm2 mol-1
d.
540.48 S cm2 mol-1
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The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose (C12H22O11) in 250 ml of water (P3). The right option for the decreasing order of osmotic pressure of these solutions is :
a.
P2 > P1 > P3
b.
P1 > P2 > P3
c.
P2 > P3 > P1
d.
P3 > P1 > P2
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The pKb of dimethylamine and pKa of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is :
a.
8.50
b.
5.50
c.
7.75
d.
6.25
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Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O2 and 2 g H2 confined in a total volume of one litre at 0°C is : [Given R=0.082 L atm mol−1 K−1, T=273 K]
a.
2.518
b.
2.602
c.
25.18
d.
26.02
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The slope of Arrhenius Plot ln k v/s 1/T of first order reaction is -5×10^3 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R=8.314 JK^-1 mol^-1]
a.
41.5 kJ mol^-1
b.
83.0 kJ mol^-1
c.
166 kJ mol^-1
d.
-83 kJ mol^-1
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The slope of Arrhenius Plot ln k v/s 1/T of first order reaction is −5×10^3 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R=8.314 JK−1 mol−1]
a.
41.5 kJ mol−1
b.
83.0 kJ mol−1
c.
166 kJ mol−1
d.
-83 kJ mol−1
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The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol−1. What is the dissociation constant of acetic acid? Given limiting molar conductivities for H+ = 350 and CH3COO- = 50 S cm2 mol−1.
a.
1.75×10−4 mol L−1
b.
2.50×10−4 mol L−1
c.
1.75×10−5 mol L−1
d.
2.50×10−5 mol L−1
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The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3 : 2 is: [At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
a.
160 mm of Hg
b.
168 mm of Hg
c.
336 mm of Hg
d.
350 mm of Hg
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Following are the statements with reference to ‘lipids’. (a) Lipids having only single bonds are called unsaturated fatty acids. (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. (e) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below.
a.
(a) and (b) only
b.
(c) and (d) only
c.
(b) and (c) only
d.
(b) and (e) only
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