HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

A metal crystallises into two cubic faces namely face centered (FCC) and body centered (BCC), whose unit cell edge lengths are 3.5 Å and 3.0 Å respectively. Find the ratio of the densities of FCC and BCC.

When phenol is heated with conc. HNO₃ in presence of conc. H₂SO₄ it yields _______.

(A) o-nitrophenol

(B) p-nitrophenol

(C) 2,4,6-trinitrophenol

(D) m-nitrophenol

Draw the structure of the chromate ion.

Which of the following compounds is used as a semipermeable membrane?

(a) Potassium ferrocyanide

(b) Potassium argentocyanide

(c) Sodium meta aluminate

(d) Copper ferrocyanide

The rate constant of a first order reaction are 0.58 S^-1 at 313 K and 0.045 S^-1 at 293 K. What is the energy of activation for the reaction?

Predict the co-ordination No. of cs⁺ ion if `r_(Cs)^+` = 1.69Å and `r_(Cl)^-` = 1.81Å.

IUPAC name of the following compound is

(a) 3 - Bromo- 3, 4- dimethylheptane

(b) 3, 4- dimethyl - 3- bromoheptane

(c) 5- Bromo- 4, 5- dimethylheptane

(d) 4, 5- dimethyl- 5- bromoheptane

Write IUPAC names of the following compounds

Write IUPAC names of the following compounds:

How is Benzonitrile converted to Benzophenone?

Write the formulae of the raw materials used for preparation of Dextran.

For a certain reaction, ∆H = − 50 kJ and ∆S = − 80 J K^-1, at what temperature does the
reaction turn from spontaneous to non-spontaneous?

(A) 6.25 K

(B) 62.5 K

(C) 625 K

(D) 6250 K

What is the action of heat on potassium permanganate?

Define activation energy.

Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from 30 °C to 50 °C. (Given R = 8.314 JK⁻¹ mol⁻¹). 

The Zieglar-Natta catalyst is used in the preparation of _______.

(A) LDPE

(B) PHBV

(C) PAN

(D) HDPE

How is methoxy benzene prepared from carbolic acid?

Write observed electronic configuration of elements from first transition series having half
filled d-orbitals.

Write the structure of melamine.

Write applications of co-ordination compounds in medicine and electroplating.