HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions

Write working of NICAD storage cell. Also write its applications.

Calculate `"E"_"cell"^circ` of the following galvanic cell:

Mg_(s) / Mg²⁺(1 M) // Ag⁺ (1 M) / Ag_(s) if `"E"_"Mg"^circ` = – 2.37 V and `"E"_"Ag"^circ` = 0.8 V. Write cell reactions involved in the above cell. Also mention if cell reaction is spontaneous or not.

The standard potential of the cell in the following reaction is ______.

\[\ce{Cd_{(s)} + Cu^{2+}_{(1M)} -> Cd^{2+}_{(1M)} + Cu_{(s)}}\]

`("E"_("Cd")^circ = - 0.403V, "E"_("Cu")^circ = 0.334V)`

The value of [H₃O⁺] in mol lit^–1 of 0.001 M acetic acid solution (K_a = 1.8 × 10^–5) is ______.

Draw a neat, labelled diagram of a standard hydrogen electrode (SHE).

Which cells is used as a source of power in flashlights?

Write electrode reactions and overall cell reaction when Leclanche's dry cell generates electricity.

Calculate molar conductivity for 0.5 M BaCl₂ if its conductivity at 298K is 0.01 Ω^–1 cm^–1.

Calculate standard Gibbs energy change at 25°C for the cell reaction.

\[\ce{Cd_{(s)} + Sn^{2+}_{ (aq)} -> Cd^{2+}_{ (aq)} + Sn_{(s)}}\]

\[\ce{E^0_{cd}}\] = –0.403 V, \[\ce{E^0_{Sn}}\] = –0.136 V

Draw labelled diagram of H₂ – O₂ fuel cell.

What is the SI unit of molar conductivity?

Write any two difficulties of setting SHE (Standard Hydrogen Electrode).

Write the net cell reaction during discharging of lead accumulator.

Write the names and chemical formulae of any one ore of zinc.

Write the names and chemical formulae of any one ore of iron.

What are Ellingham's diagrams? Write 2 features of it.

The process of leaching alumina, using sodium carbonate is called

• Bayer's process
• Decomposition
• Cyanide process
• Hall's process

What is the chemical composition of malachite?

1. CuO . CuC0₃
2. Cu(OH)₂ CuC0₃
3. CuO.Cu(OH)₂         
4. Cu₂O . Cu(OH)₂

The integrated rate equation for first order reaction is A → products

Explain calcination with reactions.