HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

State the environmental effects of the following compound:

Freons (CCl₂F₂, CCl₃F, CHClF₂)

Write the structure of the products obtained from the following ketones by action of hydrazine in presence of a slightly acidic medium.

Write the structure of the products obtained from the following ketones by action of hydrazine in presence of strong base KOH.

Arrange the following solutions in the order of increasing osmotic pressure (π) assuming complete ionization.

1. 0.5M Li₂ SO₄
2. 0.5M KCl
3. 0.5M Al₂ (SO₄)₃ 
4. 0.1 M BaCl₂

In a particular reaction, 2 kJ of heat is released by the system and 8 kJ of work is done on the system. Determine ΔU.

Identify B in the following reaction:

\[\begin{array}{cc}
\ce{O}\phantom{........}\\
||\phantom{........}\\
\ce{\underset{(Acetone)}{CH3 - C - CH3}->[CrO3] B}
\end{array}\]

Why chloroform is stored in dark coloured air tight bottles?

Calculate work done in oxidation of 4 moles of SO₂ at 25°C. (Given: R = 8.314 JK⁻¹ mol⁻¹ ).

E⁰_cell (Standard Potential of cell) for the following cell reaction is ______.

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

(E⁰_Cd = − 0.403 V and E⁰_Sn = − 0.136 V)

Which nanoparticles are used for purification of water?

Write reactions when phenol reacts with Dilute HNO₃

Calculate pK_a of HF if K_a= 7.2 x 10^-4.

Write names of two polyhalogen compounds.

Write two uses of polyhalogen compounds.

What is a vacancy defect?

Give the disadvantages of a vacancy defect.

Mention the value of the bond angle in SO₂.

Convert the following Ethanal to ethanol.

Convert the following iodomethane to methoxy methane.

Define reverse osmosis.