HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions

Schottky defects are observed in which solid among the following?

(a) Brass

(b) Cesium Chloride

(c) Zinc sulphide

(d) Stainless steel

A face centred cube (FCC) consists of how many atoms? Explain

Which of the following parameters are correct for triclinic lattice?

(A) α = β = γ = 90° and a = b = c

(B) α ≠ β ≠ γ = 90° and a ≠ b ≠ c

(C) α = γ = 90°, β ≠ 90° and a ≠ b ≠ c

(D) α ≠ β ≠ γ ≠ 90° and a ≠ b ≠ c

Calculate the number of atoms present in 2 gram of crystal which has face-centred cubic
(FCC) crystal lattice having edge length of 100 pm and density 10 gcm−3

What are Frenkel defect

A pure semiconductor is ________.

(a) an extrinsic semiconductor

(b) an intrinsic semiconductor

(c) p-type semiconductor

(d) n-type semiconductor

An ionic crystal lattice has `r^+/r` radius ratio of 0.320, its coordination number is __

(a) 3

(b) 4

(c) 6

(d) 8

The density of iron crystal is 8.54-gram cm^–3. If the edge length of the unit cell is 2.8 A° and atomic mass is 56 gram mol^–1, find the number of atoms in the unit cell.  (Given: Avogadro's number = 6.022x10²³,1A° = 1x10^-8 cm)

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?

Distinguish between crystalline solids and amorsphous solids.

Distinguish between crystalline solids and amorsphous solids.

What is the role of the following compound -
CaF₂ in metallurgy of aluminum?

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

Complete the following statement by selecting the correct alternative from the choices given: 

In a face-centered cubic lattice, atom (A) occupies the comer positions and atom (B) occupies the face centre positions. If one atom of (B) is missing from one of the face-centered points, the formula of the compound is:

Represent a cell consisting of Mg²⁺ | Mg half cell and Ag⁺
 | Ag half cell and write the cell reaction.
( `"E"_("Ag")^° = 0.799 "V", "E"_("Mg")^° = - 2.37 "V"`)

The density of silver having an atomic mass of 107.8 g mol^{- 1} is 10.8 g cm^-3. If the edge length of cubic unit cell is 4.05 × 10^{- 8}
 cm, find the number of silver atoms in the unit cell.
 ( N_A = 6.022 × 10²³, 1 Å = 10^-8 cm)

Number of types of orthorhombic unit cell is ___________.

Pyrolusite ore is _______.