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

According to less hazardous chemical synthesis point of view, instead of harmful DDT now a days _______ is used as insecticides.

Catalyst used for hydrogenation of oil is ___________

In green technology developed by Drath and Frost, adipic acid is enzymatically synthesized from _______.

Mention the total number of principles of green chemistry.

Name the γ-isomer of Benzene hexachloride.

Which principle of green chemistry has its perspective towards carrying out reactions at room temperature and pressure?

Define atom economy.

Write one example of safer solvent and hazardous solvent.

Explain prevention of waste or by products which is one of the principles of green chemistry.

Define unit cell.

Show that for a first order reaction half life is independent of initial concentration.

Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion (A): Alkyl halides are insoluble in water.

Reason (R): Alkyl halides have halogen attached to sp³ hybrid carbon.

Select the most appropriate answer from the options given below:

Isopropylbenzene on air oxidation followed by decomposition by dilute acid gives ______.

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

Explain the trends in the following atomic properties of group 16 elements:

Atomic radii

Explain the trends in the following atomic properties of group 16 elements:

Ionisation enthalpy

Explain the trends in the following atomic properties of group 16 elements:

Electronegativity

Explain the trends in the following atomic properties of group 16 elements:

Electron gain enthalpy

Write preparation of phenol from aniline.

Write chemical reactions to prepare ethanamine from:

Acetonitrile