BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are:
a.
sp3 and 4
b.
sp3 and 6
c.
sp2 and 6
Correct Answer
d.
sp2 and 8
Step-by-Step AI Explanation
Verified Method
Boron has 3 valence electrons and forms 3 B-F bonds, totaling 6 electrons (electron deficient). Hybridization is sp2.
Q54mcq
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 weak van der Waals forces and thus possess very low melting and boiling points, not high.
Q54mcq
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 the presence of only weak dispersion forces between their atoms.
Q55mcq
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm^2 mol^-1 respectively. The molar conductance of CH3COOH at infinite dilution is:
a.
201.28 S cm^2 mol^-1
b.
390.71 S cm^2 mol^-1
Correct Answer
c.
698.28 S cm^2 mol^-1
d.
540.48 S cm^2 mol^-1
Step-by-Step AI Explanation
Verified Method
According to Kohlrausch's law, molar conductivity of CH3COOH = molar conductivity(CH3COONa) + molar conductivity(HCl) - molar conductivity(NaCl) = 91.0 + 426.16 - 126.45 = 390.71 S cm^2 mol^-1.
Q55mcq
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. Choose the correct answer from the options given below.
a.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
b.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
c.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
d.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
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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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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 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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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.
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.
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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 conductivity of 0.007 M acetic acid is 20 S cm^2 mol^-1. Given molar conductivity at infinite dilution for H+ is 350 S cm^2 mol^-1 and for CH3COO- is 50 S cm^2 mol^-1. What is the dissociation constant of acetic acid?
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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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)(i)(ii)(iii)
b.
(2)(i)(iv)(iii)(ii)
c.
(3)(ii)(i)(iv)(iii)
d.
(4)(iv)(iii)(i)(ii)
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