Molecular Polarity
38 previous year questions.
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Chapter Questions 38 MCQs
50 mL of 1 M HCl was completely reacted with g of CaCO3 to form CaCl2, CO2, and H2O. What is the value of in g?
The dissociation constants of a diacid HA are and . The pH of 0.011 M solution is 2.0. What is the value of ?
Two statements are given below:
I. SO₂ is used as antioxidant in wine
II. BHA is used as food preservative in dry fruits
The number of molecules having one lone pair of electrons on the central atom is from the following list: SnCl , XeF , SO , ClF , BrF , H O, XeO .
What is Z in the following set of reactions?
Malachite is a mineral of metal ‘X’. Its composition is:
The mass of particle X is four times the mass of particle Y. The velocity of particle Y is four times the velocity of X. The ratio of de Broglie wavelengths of X and Y is:
Adsorption of a gas on a solid obeys the Freundlich adsorption isotherm. In the graph drawn between (on the y-axis) and (on the x-axis), the slope and intercept are found to be 1 and 0.3, respectively. If the initial pressure of the gas is 0.02 atm, the mass of the gas adsorbed per gram of solid is ( ).
Acetophenone can be prepared from which of the following reactants?
Which of the following sets are not correctly matched?
i. XeF₄ - sp³
ii. SF₄ - sp³d
iii. SO₃ - sp²
iv. SnCl₂ - sp
At 293 K, the density of an aqueous solution containing 120 g of urea (NH CONH ) per dm is 1.02 kg dm . The mole fraction of urea is approximately:
At (K), the following data was obtained for the reaction: .
From the data, the rate constant of the reaction (in ) is:
An alkyl halide C H Br(X) undergoes hydrolysis preferably in polar protic solvents. X can be prepared from which of the following reactants?
A solid is dissolved in 1 L water. The enthalpy of its solution ( ) is 'x' kJ/mol. The hydration enthalpy ( ) for the same reaction is 'y' kJ/mol. What is lattice enthalpy ( ) of the solid in kJ/mol?
Which of the following forces stabilize the secondary structure of proteins?
A. Hydrogen bonds
B. Covalent bonds
C. Disulphide linkages
D. Vander Waals forces
Arrange the following complexes in increasing order of the number of unpaired electrons present in the central metal ion:
I.
II.
III.
Which one of the following ions is diamagnetic in nature?
The number of mixed oxides from the following is:
The dispersed phase and dispersion medium in smoke, respectively, are:
A conductivity cell is filled with a solution of KCl of concentration 0.2 mol dm and its conductivity is 0.28 S m . The resistance of this solution is 82.2 Ω. The same cell filled with a solution of 0.0025 mol dm K₂SO₄ showed a resistance of 325 Ω. The molar conductivity of K₂SO₄ solution (in S m² mol ) is:
Ethylene glycol (C H O ) is used as an antifreeze in cars. In a certain place, it is desired that water freezes at 258K. How much weight of ethylene glycol is needed to prevent separation of ice from 500 g of water?
A crystalline solid of the type AB has a ccp arrangement for its element B. So, A occupies:
66% of tetrahedral voids
33% of tetrahedral voids
33% of octahedral voids
66% of octahedral voids
0.2 g of an organic compound containing C, H, and O on complete combustion gave 0.46 g of and 0.25 g of . What is the percentage of oxygen in that compound?
Which of the following, when present in higher concentrations in air, retards the rate of photosynthesis?
In the reaction of sodium borohydride with gives diborane as one product. Identify and type of reaction.
Identify the correct order of polarizing power of given cations:
Identify the correct statements from the following:
(i) In gas phase, the dihedral angle in H₂O₂ is 90.2°
(ii) 50% H₂SO₄ is used in the preparation of H₂O₂ by electrolysis method
(iii) H₂O₂ is used in the synthesis of cephalosporin
A few isotherms of CO2 are shown below. Identify the correct statements (Tc is the critical temperature of CO2; T1
I. At point X, CO₂ exists as liquid
II. At point Y, CO₂ exists as gas
III. At point Z, CO₂ exists as liquid
At 300 K, the value of of an ideal gas is . What is the (in ) of this gas at the same temperature?
Electronic configurations of four elements A, B, C, and D are given below: The correct order of increasing tendency to gain electrons is:
The correct set of four quantum numbers for an electron in a 4d subshell is:
Arrange the following in increasing order of their pK values. 
A < B < C
C < B < A
B < C < A
A < C < B
What are and in the following reactions?
Two statements are given below:
I. Cellulose acetate is rayon
II. Perlan-L is nylon 6, 6
What are and respectively in the following reaction?
I. For spontaneous reaction, and
II. Pressure is an intensive property
III. Bomb calorimeter works at constant volume
At 500 K, for the reaction the equilibrium constant is 1.8 mol/L. What is in atm at the same temperature?
Which of the following can act as Lewis acids?
[i.]
[ii.]
[iii.]