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

Calcium carbonate reacts with aqueous \[\ce{HCl}\] to give \[\ce{CaCl2}\] and \[\ce{CO2}\] according to the reaction given below:

\[\ce{CaCO3(s) + 2HCl (aq) -> CaCl2 (aq) + CO2(g) + H2O (l)}\]

What mass of \[\ce{CaCl2}\] will be formed when 250 mL of 0.76 M \[\ce{HCl}\] reacts with 1000 g of \[\ce{CaCO3}\]? Name the limiting reagent. Calculate the number of moles of \[\ce{CaCl2}\] formed in the reaction.

Arrange s, p and d sub-shells of a shell in the increasing order of effective nuclear charge (Z_eff) experienced by the electron present in them.

Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.

The types of hybrid orbitals of nitrogen in \[\ce{NO^{+}2}\] , \[\ce{NO^{-}3}\] and \[\ce{NH^{+}4}\] respectively are expected to be ______.

Which of the following angle corresponds to sp² hybridisation?

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.

\[\ce{CH3 - \overset{∗}{C} ≡ CH}\]

The lattice enthalpy of an ionic compound is the enthalpy when one mole of an ionic compound present in its gaseous state, dissociates into its ions. It is impossible to determine it directly by experiment. Suggest and explain an indirect method to measure lattice enthalpy of \[\ce{NaCl(s)}\].

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.