HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Answer the following in brief.

Why do the cell potential of lead accumulators decrease when it generates electricity? How the cell potential can be increased?

Answer the following in brief.

Write the electrode reactions and net cell reaction in NICAD battery.

Answer the following in one or two sentences.

Why all collisions between reactant molecules do not lead to a chemical reaction?

Answer the following in one or two sentences

What is the activation energy of a reaction?

Answer the following:

Write the electrode reactions when lead storage cell generates electricity. What are the anode and cathode and write the electrode reactions during its recharging?

What are anode and cathode for Leclanche’ dry cell?

Answer the following in brief.

What are the requirements for the colliding reactant molecules to lead to products?

Write the reaction of conc. H₂SO₄ with sugar.

Which steps are involved in the manufacture of potassium dichromate from chromite ore?

Answer the following

Balance the following equation

\[\ce{K2Cr2O7 + Kl + H2SO4 -> K2SO4 + Cr2(SO4)3 + 7H2O + 3l2}\]

Which of the following statements is applicable for 0.1 M urea solution and 0.1 M sucrose solution?

What are hypertonic solutions?

Observe the following compounds and answer the questions given below.

      (I)

\[\ce{\underset{\text{(II)}}{CH3 - CH2 - Br}}\]

1. Identify the type of halides.
2. Explain the nature of the C – Br bond in both of these halides.
3. Which of these compounds will undergo aqueous alkaline hydrolysis readily? Write the reaction in support of your answer.

Explain the osmotic pressure of a solution with the help of a thistle tube.

Explain the phenomenon of osmosis.

Define Osmosis.

What is substituted imine called?

Write the potential produced through the NICAD storage cell.

Mercury battery provides more constant voltage than any other dry cell: Explain.

Explain aldol condensation reaction in detail.