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

What is the effect of adding a catalyst on Activation energy (E_a)

What type of isomerism is shown by the complex [Co(NH₃)₅(SCN)]²⁺?

The cell in which the following reaction occurs:

`2Fe^(3+) (aq) + 2I^(-) (aq) ---> 2Fe^(2+) (aq) + I_2 (s)` has `E_"cell"^@` = 0.236 V at  298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol⁻¹)

A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0·3010, log 4 = 0·6021, R = 8·314 JK^–1 mol^–1)

What type of isomerism is exhibited by the complex [Co(NH₃)₅Cl]SO₄?

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

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

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:\[\begin{array}{c}
\ce{O\phantom{----}O\phantom{-}}\\
\ce{||\phantom{----}||\phantom{-}}\\
\ce{CH3-C-CH2-C-OCH3}
\end{array}\ce{->[(i)NaBH4][(ii)H+]}\]