List of top Chemistry Questions on Molecular Polarity

Arrange the following in increasing order of their pK$_b$ values. 

What is Z in the following set of reactions?

Acetophenone can be prepared from which of the following reactants? 

What are $X$ and $Y$ in the following reactions? 

What are $X$ and $Y$ respectively in the following reaction? 

An alkyl halide C$_4$H$_8$Br(X) undergoes hydrolysis preferably in polar protic solvents. X can be prepared from which of the following reactants? 

Two statements are given below:
I. SO₂ is used as antioxidant in wine
II. BHA is used as food preservative in dry fruits

Which of the following forces stabilize the secondary structure of proteins? 
A. Hydrogen bonds
B. Covalent bonds
C. Disulphide linkages
D. Vander Waals forces

Two statements are given below:
I. Cellulose acetate is rayon
II. Perlan-L is nylon 6, 6

Arrange the following complexes in increasing order of the number of unpaired electrons present in the central metal ion:
I. $[Fe(CN)_6]^{3-}$
II. $[Co(C_2O_4)_3]^{3-}$
III. $[Mn(CN)_6]^{3-}$ 

Which one of the following ions is diamagnetic in nature? 
 

The number of mixed oxides from the following is: $${Al}_2{O}_3, {Pb}_3{O}_4, {Mn}_2{O}_7, {Fe}_3{O}_4, {V}_2{O}_5, {Sb}_2{O}_3$$ 
 

Malachite is a mineral of metal ‘X’. Its composition is: 
 

Adsorption of a gas on a solid obeys the Freundlich adsorption isotherm. In the graph drawn between $\log (x/m)$ (on the y-axis) and $\log p$ (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 (${antilog } 0.3 = 2$). 
 

The dispersed phase and dispersion medium in smoke, respectively, are: 
 

At $T$ (K), the following data was obtained for the reaction: $$S_2O_8^{2-} + 3 I^- \rightarrow 2 SO_4^{2-} + I_3^-$$ 

From the data, the rate constant of the reaction (in M$^{-1}$ s$^{-1}$) is: 
 

A conductivity cell is filled with a solution of KCl of concentration 0.2 mol dm$^{-3}$ and its conductivity is 0.28 S m$^{-1}$. The resistance of this solution is 82.2 Ω. The same cell filled with a solution of 0.0025 mol dm$^{-3}$ K₂SO₄ showed a resistance of 325 Ω. The molar conductivity of K₂SO₄ solution (in S m² mol$^{-1}$) is: 
 

Ethylene glycol (C$_2$H$_6$O$_2$) 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? $$(K_f { of water} = 1.86 { K kg mol}^{-1})$$ 
 

At 293 K, the density of an aqueous solution containing 120 g of urea (NH$_2$CONH$_2$) per dm$^3$ is 1.02 kg dm$^{-3}$. The mole fraction of urea is approximately: 

A crystalline solid of the type AB$_2$ has a ccp arrangement for its element B. So, A occupies: 
 

0.2 g of an organic compound containing C, H, and O on complete combustion gave 0.46 g of $CO_2$ and 0.25 g of $H_2O$. 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? 

Which of the following can act as Lewis acids?
[i.] ${CCl}_4$ 
[ii.] ${GeCl}_4$ 
[iii.] ${SiF}_4$ 

In the reaction of sodium borohydride with $X$ gives diborane as one product. Identify $X$ and type of reaction. 
 

Identify the correct order of polarizing power of given cations: