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

In a reaction, \[\ce{A + B2 -> AB2}\]

Identify the limiting reagent, if any, in the following reaction mixture.

100 atoms of A + 100 molecules of B

In a reaction, \[\ce{A + B2 -> AB2}\]

Identify the limiting reagent, if any, in the following reaction mixture.

5 mol A + 2.5 mol B

In a reaction, \[\ce{A + B2 -> AB2}\]

Identify the limiting reagent, if any, in the following reaction mixture.

2.5 mol A + 5 mol B

Apart from tetrahedral geometry, another possible geometry for CH₄ is square planar with the four H atoms at the corners of the square and the C atom at its centre. Explain why CH₄ is not square planar?

Draw a diagram showing the formation of a double bond and a triple bond between carbon atoms in C₂H₄ and C₂H₂ molecules.

What is the total number of sigma and pi bonds in the following molecules?

C₂H₂

What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

Distinguish between a sigma and a pi bond.

Give a brief description of the principle of the following technique taking an example.

Crystallisation 

Describe the method, which can be used to separate two compounds with different solubilities in a solvent S.

What do you understand by the term hydrogen economy?

What do you understand by the term hydrogenation?

What is the total number of sigma and pi bonds in the following molecules?

C₂H₄

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction \[\ce{2A + 4B -> 3C + 4D}\], when 5 moles of A react with 6 moles of B, then which is the limiting reagent?

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction \[\ce{2A + 4B -> 3C + 4D}\], when 5 moles of A react with 6 moles of B, then calculate the amount of C formed? 

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?