Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Name the following halide according to the IUPAC system and classify it as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

\[\ce{CH3C(Cl)(C2H5)CH2CH3}\]

Name the following halide according to the IUPAC system and classify it as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

\[\ce{CH3CH2C(CH3)2CH2I}\]

Write the structure of the following compound:

1,4-Dibromobut-2-ene

Give the IUPAC name of the following compound:

\[\ce{(CCl3)3CCl}\]

What are interstitial compounds?

Write the differences between physisorption and chemisorption with respect to the following: 

(i) Specificity

(ii) Temperature dependence

(iii) Reversibility and

(iv) Enthalpy change

Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?

Which of the following cations are coloured in aqueous solutions and why ?

Sc³⁺, V³⁺, Ti⁴⁺, Mn²⁺ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)

How would you account for the following? 

Transition metals exhibit variable oxidation states.

Complete the following chemical equations:

`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`

`(ii) 2CrO_4^(2-)+2H^+ ->`

`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`

Pb(NO₃)₂ on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas

Account for the following:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.

Account for the following: 

Cr²⁺ is a strong reducing agent.

Account for the following:

Cu⁺² salts are coloured, while Zn²⁺ salts are white.

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Write the element which shows maximum number of oxidation states. Give reason.

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element has the highest m.p?

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element shows only +3 oxidation state?

The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?

Why do the transition elements have higher enthalpies of atomisation?

In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?