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

Complete the following equations:

\[\ce{CO (g) + 2H2 (g) ->[Cobalt][Catalyst]}\]

Discuss briefly de-mineralisation of water by ion exchange resin.

Why is the Ionisation enthalpy of hydrogen higher than that of sodium?

Match the items in Column I with the relevant item in Column II.

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.

Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.

If a trivalent atom replaces a few silicon atoms in three-dimensional network of silicon dioxide, what would be the type of charge on overall structure?

Match the ions given in Column I with their nature given in Column II.

Arrange the halogens F₂, Cl₂, Br₂, I₂, in order of their increasing reactivity with alkanes.

The addition of HBr to 1-butene gives a mixture of products A, B and C

(A)
(B)
(C)	CH3 – CH2 – CH2 – CH2 – Br

The mixture consists of:

Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

Which of the following alkenes on ozonolysis give a mixture of ketones only?

(i)	CH3 – CH = CH – CH3
(ii)	\[\begin{array}{cc} \ce{CH3 - C - CH = CH2}\\ |\phantom{.......}\\ \ce{CH3}\phantom{....} \end{array}\]
(iii)
(iv)	\[\begin{array}{cc} \phantom{...................}\ce{CH3}\\ \phantom{..............}/\\ \ce{(CH3)2 C = C}\\ \phantom{..............}\backslash\\ \phantom{...................}\ce{CH3} \end{array}\]

In the presence of peroxide addition of HBr to propene takes place according to anti Markovnikov’s rule but peroxide effect is not seen in the case of HCl and HI. Explain.

An alkene ‘A’ contains three C – C, eight C – H σ bonds and one C – C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write the IUPAC name of ‘A’.

An alkene ‘A’ contains three C-C, eight C-H σ bonds and one C-C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write the IUPAC name of ‘A’.

What is the basic difference between the terms electron gain enthalpy and electronegativity?

How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?

Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number (`bar v`) of the yellow light.

Find energy of each of the photons which correspond to light of frequency 3 × 10¹⁵ Hz.

Find energy of each of the photons which have the wavelength of 0.50 Å.

What is the number of photons of light with a wavelength of 4000 pm that provide 1 J of energy?