Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Chemistry

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.

\[\ce{CH3 - \overset{∗}{C} ≡ CH}\]

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:

Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states.

The behaviour of matter in different states is governed by various physical laws. According to you what are the factors that determine the state of matter?

Assertion (A): Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules

Reason (R): Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

Assertion (A): Liquids tend to have maximum number of molecules at their surface.

Reason (R): Small liquid drops have spherical shape.

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 \[\ce{NaCl(s)}\].