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

A first order reaction takes 30 minutes for 50% completion. Calculate the time required for 90% completion of this reaction.

(log 2 = 0.3010)

How much charge is required for the reduction of 1 mol of Zn²⁺ to Zn?

Using IUPAC norms write the formulate for the following coordination compound: 

Hexaamminecobalt(III) chloride

Using IUPAC norms write the formulate for the following coordination compound:

Potassium tetrachloridonickelate (II)

How do you convert the following: C₆H₅CONH₂ to C₆H₅NH₂

How do you convert the following: Ethanenitrile to ethanamine

Complete the following equations : 2 MnO₂ + 4 KOH + O₂ →

Complete the following equations : 2 Na₂CrO₄ + 2 H ⁺ →​

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagents :

CH₃MgBr and then H₃O⁺

Write the names of monomers used for getting the following polymer:

Neoprene

Give the structures of A, B and C in the following reactions :

Give the structures of A, B and C in the following reactions :

Define the following terms : Molarity

Complete the following equations:Cr₂O₇^2- + 2OH^- →

Complete the following equations : MnO₄- + 4H⁺ + 3e^- →

Complete the following equation : MnO₄^- + 8H⁺ + 5e^- →

Write the principle behind the froth floatation process. What is the role of collectors in this process?

Complete the following chemical equation

Cr₂O₇^2- + 3Sn²⁺ + 14H⁺ →

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

Write the Nernst equation and emf of the following cell at 298 K:

Mg_(s) | Mg²⁺ (0.001 M) || Cu²⁺ (0.0001 M) | Cu_(s)