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

Explain the following reaction with a suitable example.

Hofmann elimination reaction

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:

Write the name of the product formed by the action of LiAlH₄/ether on acetamide.

Identify the compo ds A and B in the following reactions:

\[\ce{A ->[Nitrating mixture] B ->[(i) Sn/cone. HCI][(ii) NaOH] Aniline}\]

Identify A and B in the following reaction.

\[\ce{C6H5CH2Br ->[Alco.][KCN] A ->[Na/Ethanol][reduction] B}\]

Write the name of reduction product formed when ethyl cyanide is treated with sodium and alcohol.

p - type semi-conductors are made by mixing silicon with impurities of ______.

In a semiconductor, acceptor impurity is.................................

1. antimony
2. indium
3. phosphorous
4. arsenic

What type of semiconductor is obtained when silicon is doped with boron? 

To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:

(a) 2

(b) 3

(c) 4

(d) 5

When a hole is produced in P-type semiconductor, there is _______.

What is ‘effective atomic number’ (EAN)?

Calculate the effective atomic number of the central metal atom in the following  compounds:

K₄Fe(CN)₆  Fe(Z=26)

Effective atomic number rule is used to find _______.
(A) geometry of complex
(B) stability of complex
(C) number of isomers of complex
(D) number of possible ligands around metal ion in complex

Write applications of standard molar entropy°.

Calculate EAN of cobalt (Z=27) in [CO(NH₃)₆]⁺³ and of zinc (Z=30) in [Zn(NH₃)₄]SO₄.

Calculate the effective atomic number of the central metal atom in the following  compounds:

Cr(CO)₆ Cr(Z=24)

A pure semiconductor is ________.

(a) an extrinsic semiconductor

(b) an intrinsic semiconductor

(c) p-type semiconductor

(d) n-type semiconductor

Distinguish between p-type and n-type semiconductors.

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?