Science (English Medium) Class 11 - CBSE Question Bank Solutions for Chemistry

Predict the shapes of the following molecules on the basis of hybridisation.

\[\ce{BCl3, CH4 , CO2, NH3}\]

Match the species in Column I with the type of hybrid orbitals in Column II.

Match the shape of molecules in Column I with the type of hybridisation in Column II.

Discuss the concept of hybridisation. What are its different types in a carbon atom.

What is the type of hybridisation of carbon atoms marked with star.

\[\begin{array}{cc}
\phantom{.....}\ce{O}\\
\phantom{.....}||\\
\ce{\overset{∗}{C}H2 = CH - \overset{∗}{C} - O - H}
\end{array}\]

What is the type of hybridisation of carbon atoms marked with star.

\[\ce{CH3 - \overset{∗}{C}H2 - OH}\]

What is the type of hybridisation of carbon atoms marked with star.

\[\begin{array}{cc}
\phantom{..........}\ce{O}\\
\phantom{..........}||\\
\ce{CH3 - CH2 - \overset{∗}{C} - H}
\end{array}\]

What is the type of hybridisation of carbon atoms marked with star.

\[\ce{\overset{∗}{C}H3 - CH = CH - CH3}\]

What is the type of hybridisation of carbon atoms marked with star.

\[\ce{CH3 - \overset{∗}{C} ≡ CH}\]

Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with the chemical equation if required.

Benzoic acid is a organic compound. Its crude sample can be purified by crystallisation from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?

Which are the correct IUPAC names of the following compound?

\[\begin{array}{cc}
\ce{H3C - CH2 - CH2 - CH2 - CH - CH2 - CH2 - CH2 - CH2 - CH3}\\
|\phantom{.........}\\
\ce{CH2}\phantom{......}\\
|\phantom{.........}\\
\ce{HC3 - C - CH3}\phantom{.........}\\
|\phantom{.........}\\
\ce{CH3}\phantom{......}
\end{array}\]

(i) 5 – (2′, 2′–Dimethylpropyl)-decane

(ii) 4 – Butyl – 2, 2– dimethylnonane

(iii) 2, 2– Dimethyl – 4– pentyloctane

(iv) 5 – neo-Pentyldecane

Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in air.

Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in 16 g of dioxygen.

Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.

What is the concentration of sugar (C₁₂H₂₂O₁₁) in mol L^–1 if its 20 g are dissolved in enough water to make a final volume up to 2 L?

If the density of methanol is 0.793 kg L^–1, what is its volume needed for making 2.5 L of its 0.25 M solution?

A sample of drinking water was found to be severely contaminated with chloroform, CHCl₃, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

1. Express this in percent by mass.
2. Determine the molality of chloroform in the water sample.

Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:

\[\ce{N2 (g) + 3H2 (g) → 2NH3 (g)}\]

(i) Calculate the mass of ammonia produced if 2.00 × 10³ g dinitrogen reacts with 1.00 × 10³ g of dihydrogen.

(ii) Will any of the two reactants remain unreacted?

(iii) If yes, which one and what would be its mass?

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).