Actinoids are highly reactive metals, especially when finely divided.
b.
Actinoid contraction is greater for element to element than Lanthanoid contraction.
c.
Most of the trivalent Lanthanoid ions are colorless in the solid state.
Correct Answer
d.
Lanthanoids are good conductors of heat and electricity.
Step-by-Step AI Explanation
Verified Method
Most trivalent lanthanoid ions are colored due to f-f transitions. The statement claiming they are colorless is incorrect.
Q53mcq
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.
Statement I is incorrect but Statement II is true.
b.
Both Statement I and Statement II are true.
Correct Answer
c.
Both Statement I and Statement II are false.
d.
Statement I is correct but Statement II is false.
Step-by-Step AI Explanation
Verified Method
Acid strength in hydrohalic acids increases with bond length and decreases with bond strength. Since bond strength decreases from HF to HI, acidity increases.
Q53mcq
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.
Statement I is incorrect but Statement II is true.
b.
Both Statement I and Statement II are true.
Correct Answer
c.
Both Statement I and Statement II are false.
d.
Statement I is correct but Statement II is false.
Step-by-Step AI Explanation
Verified Method
Bond length increases down the group, bond dissociation energy decreases, making it easier to release H+, so acidity increases. Both statements are correct.
Q54mcq
Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?
a.
CV = R * CP
b.
CP / CV = R
c.
CP - CV = R
Correct Answer
d.
CP = R * CV
Step-by-Step AI Explanation
Verified Method
For an ideal gas, the Mayer's relation is CP - CV = R.
Q54mcq
Which one among the following is the correct option for right relationship between Cp and Cv for one mole of ideal gas?
a.
Cv = R Cp
b.
Cp / Cv = R
c.
Cp - Cv = R
Correct Answer
d.
Cp = R Cv
Step-by-Step AI Explanation
Verified Method
For one mole of an ideal gas, Mayer's relation is Cp - Cv = R.
Q55mcq
The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is:
a.
3
Correct Answer
b.
7
c.
5
d.
2
Step-by-Step AI Explanation
Verified Method
There are 3 types of body-centered unit cells in the 14 Bravais lattices: Cubic (bcc), Tetragonal (body-centered), and Orthorhombic (body-centered).
Q56mcq
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is:
a.
Beryllium chloride
Correct Answer
b.
Calcium chloride
c.
Strontium chloride
d.
Magnesium chloride
Step-by-Step AI Explanation
Verified Method
Beryllium chloride (BeCl2) is covalent due to the small size and high polarizing power of the Be2+ ion, making it soluble in organic solvents.
Q58mcq
The maximum temperature that can be achieved in blast furnace is:
a.
upto 5000 K
b.
upto 1200 K
c.
upto 2200 K
Correct Answer
d.
upto 1900 K
Step-by-Step AI Explanation
Verified Method
The maximum temperature in the combustion zone of a blast furnace reaches approximately 2173 K (about 2200 K).
Q59mcq
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are:
a.
sp2 and 8
b.
sp3 and 4
c.
sp3 and 6
d.
sp2 and 6
Correct Answer
Step-by-Step AI Explanation
Verified Method
Boron in BF3 is sp2 hybridized and has 6 electrons in its valence shell (octet incomplete).
Q61mcq
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.
Match List - I with List - II.
List - I: (a) PCl5 (b) SF6 (c) BrF5 (d) BF3
List - II: (i) Square pyramidal (ii) Trigonal planar (iii) Octahedral (iv) Trigonal bipyramidal
a.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
b.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
c.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
d.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
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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.
CH4
b.
CH
c.
CH2
d.
CH3
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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.
CH4
b.
CH
c.
CH2
d.
CH3
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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.
6.25
b.
8.50
c.
5.50
d.
7.75
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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.
P3 > P1 > P2
b.
P2 > P1 > P3
c.
P1 > P2 > P3
d.
P2 > P3 > P1
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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.
350 mm of Hg
b.
160 mm of Hg
c.
168 mm of Hg
d.
336 mm of Hg
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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.
350 mm of Hg
b.
160 mm of Hg
c.
168 mm of Hg
d.
336 mm of Hg
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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 J K^-1 mol^-1]
a.
-83 kJ mol^-1
b.
41.5 kJ mol^-1
c.
83.0 kJ mol^-1
d.
166 kJ mol^-1
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The slope of Arrhenius Plot (ln k vs 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−1mol−1]
a.
−83 kJ mol−1
b.
41.57 kJ mol−1
c.
415.7 kJ mol−1
d.
83 kJ mol−1
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The molar conductivity of 0.007 M acetic acid is 20 S cm^2 mol^-1. What is the dissociation constant of acetic acid? Given: λ°(H+) = 350 S cm^2 mol^-1, λ°(CH3COO-) = 50 S cm^2 mol^-1.
a.
2.50 × 10^-5 mol L^-1
b.
1.75 × 10^-4 mol L^-1
c.
2.50 × 10^-4 mol L^-1
d.
1.75 × 10^-5 mol L^-1
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Match List - I with List - II:
(a) Protein (i) C=C double bonds
(b) Unsaturated fatty acid (ii) Phosphodiester bonds
(c) Nucleic acid (iii) Glycosidic bonds
(d) Polysaccharide (iv) Peptide bonds
a.
(1) (iv)(iii)(i)(ii)
b.
(2) (iv)(i)(ii)(iii)
c.
(3) (i)(iv)(iii)(ii)
d.
(4) (ii)(i)(iv)(iii)
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