HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

Write the name of nanomaterial which is used in water purification.

The enthalpy change for the chemical reaction \[\ce{H2O_{(s)} -> H2O_{(l)}}\] is called enthalpy of ______.

The name of metal nanoparticle which acts as highly effective bacterial disinfectant in water purification process is ______.

Write structure of adipic acid.

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

Explain the following reaction:

Cannizzaro reaction

Write the SI unit of the cryoscopic constant.

Write the relationship between solubility and solubility product for PbI₂.

What is the action of the following reagents on ethyl amine?

Chloroform and caustic potash

Explain the formation of [CoF₆]^3Θ complex with respect to

1. Hybridisation
2. Magnetic properties
3. Inner/outer complex
4. Geometry

Mention some important uses of the potassium permanganate salt.

The solubility product of AgBr is 5.2 × 10⁻¹³ Calculate its solubility in mol dm⁻³ and g dm⁻³ (Molar mass of AgBr = 187.8g mol⁻¹)

At the freezing point ______.

The solubility product of Agl is 1.56 x 10⁻¹⁶. What iodide ion concentration will be required to precipitate Agl from 0.01 M AgNO³ solution?

Which innovative material has been developed using the lotus effect?

Complete the following reaction:

\[\ce{Na2SO3 + Cl2 + H2O -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{}}\]

Describe the bonding in the tetrahedral complex Ni(CO)₄ on the basis of valence bond theory. Give the orbital diagrams of metal atoms in free state and in the complex. Mention the number of unpaired electrons in the complex.

The relationship between solubility and solubility product for silver carbonate is ______.

Define the enthalpy of freezing.

Give reactions to show that SO₂ gas acts as a reducing agent.