Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Write the structures of the main products of the following reactions:

Predict the products of the following reactions :

Predict the products of the following reactions :

A first order reaction takes 10 minutes for 25% decomposition. Calculate t_1/2 for the reaction.

(Given : log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021)

Show that the time required for 99% completion is double of the time required for the completion of 90% reaction.

Write the IUPAC name of the complex [Cr(NH₃)₄Cl₂]⁺. What type of isomerism does it exhibit?

Explain the following terms :

Half life period of a reaction (t_1/2)

 Following reaction takes place in the cell: 
`Zn(s) + Ag_2O(s)+H_2O(l) -> Zn^{2+}(aq) + 2Ag (s) + 2OH^- (aq)`
Calculate `Delta_r G^0` of the reaction

[Given ; `E^0_(Zn^{2+}//Zn)` = -0.76V

`E_((Zn^{2+}//Zn)) = 0.76V`

`E_(Ag^4//Ag)^0 = 0.80V, 1F = 96,500 C mol^-1 ]`
          

Define the following terms with a suitable example of each: 
 Bactericidal antibiotics 

The decomposition of a hydrocarbon has value of rate constant as 2.5×10⁴s^-1 At 27° what temperature would rate constant be 7.5×10⁴ × ³ s^-1if energy of activation is  19.147 × 10³ J mol^-1 ?

 Write a condition under which a bimolecular reaction is kinetically first order. Give an example of  such a reaction. (Given : log2 = 0.3010,log 3 = 0.4771, log5 = 0.6990).

 Predict the main product of the following reactions:

 Predict the main product of the following reaction:\[\begin{array}{c}
\ce{O\phantom{----}O\phantom{-}}\\
\ce{||\phantom{----}||\phantom{-}}\\
\ce{CH3-C-CH2-C-OCH3}
\end{array}\ce{->[(i)NaBH4][(ii)H+]}\]

Write IUPAC name of the complex [Pt(en)₂Cl₂]. Draw structures of geometrical isomers for this complex. 

Why dextro and laevorotatory isomers of Butan-2-ol are difficult to separate by fractional distillation? 

Write chemical equation of the following reaction : 
Acetophenone is treated with `("Zn"("Hg"))/"Conc.HCl"`.

Define the following term with a suitable example in each:
Broad-spectrum antibiotics

Define the following term with a suitable example in each:
Disinfectants

At 100°C the vapour pressure of a solution containing 6.5 g a solute in 100 g water is 732 mm. If K_b = 0.52, the boiling point of this solution will be ______.

The coordination number of AB having rock salt geometry is ____________.