آئنک مرکب کی ایک مثال _____ ہے؟
Explanation
NaCl is also known as Sodium Chloride, or common table salt. It is a classic example of an ionic compound , where sodium (Na) loses an electron to become a positively charged ion (cation), and chlorine (Cl) gains an electron to become a negatively charged ion (anion).
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A. al(4/12)
B. None of these
C. a/(4/√3)
D. a/4/13)
Explanation
In a Body-Centered Cubic (BCC) lattice, the relation between the lattice parameter a and atomic radius r is:
4 r = 3 a Since atomic diameter = 2r , solving gives:
Atomic Diameter = 4 r 2 = a 4 / 3 Show/Hide Explanation
آئنک کمپاؤنڈ کی جائیداد مندرجہ ذیل میں سے کون ہے؟
A. None of these
B. Low melting and boiling points
C. High melting and boiling
D. Non-conductors
Explanation
Ionic compounds have strong electrostatic forces between ions, requiring high energy to break, resulting in high melting and boiling points. Examples include sodium chloride (NaCl) and potassium bromide (KBr), which have high thermal stability. Show/Hide Explanation
A. Face-centered cubic (FCC)
B. Simple cubic (SC)
C. Body-centered cubic (BCC)
D. None of these
Explanation
Sodium chloride (NaCl) crystallizes in a face-centered cubic (FCC) lattice with Cl⁻ ions forming an FCC arrangement and Na⁺ ions occupying octahedral voids. This structure ensures high stability and strong ionic bonding in the crystal. Show/Hide Explanation
مندرجہ ذیل میں سے کون سا آئسومورفس جوڑی نہیں ہے؟
A. Na₂CO₃, CaCO₃
B. K₂SO₄, K₂Cr₂O₇
C. None of these
D. NaF, MgO
Explanation
The pair that is not isomorphous is Na₂CO₃, CaCO₃.
While both compounds have similar chemical formulas .
The difference in ionic radii between sodium and calcium leads to different crystal structures, m aking them not isomorphous.
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بریگ کی مساوات _____ کا نتیجہ ہے؟
A. Schrodinger equation
B. Laue equations
C. Diamond structure
D. None of these
Explanation
Bragg's equation (nλ = 2d sinθ) is derived from Laue equations . It describe the diffraction of X-rays by crystal lattices. Max von Laue formulated these equations, which later led to Bragg's Law , explaining X-ray diffraction patterns. Show/Hide Explanation
A. 2.9°
B. None of these
C. 1.5°
D. 5.8°
Explanation
To find the smallest Bragg scattering angle, we can use Bragg's law:
2d sin(θ) = nλ
where d is the distance between the atomic planes, θ is the scattering angle, n is an integer (which is 1 for the smallest angle), and λ is the wavelength of the X-ray.
Given:
d = 0.3 nm
λ = 0.03 nm
Rearranging Bragg's law to solve for θ, we get:
sin(θ) = λ / (2d)
= 0.03 nm / (2 × 0.3 nm)
= 0.05
θ = arcsin(0.05)
≈ 2.9°
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A. Diamond
B. SiO2
C. Graphite
D. Ss
Explanation
Diamond is a covalent network crystal.
It's composed of carbon atoms covalently bonded to each other in a three-dimensional tetrahedral lattice.
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وہ کرسٹل جن میں جالی کے نقطوں پر دھاتی آئنوں کا قبضہ ہوتا ہے؟
A. Metallic crystals
B. Ionic crystals
C. Covalent crystals
D. Molecular crystals
Explanation
Crystals in which lattice points are occupied by metal ions are a) Ionic crystals.
Ionic crystals are formed by the electrostatic attraction between positively charged metal cations and negatively charged anions.
These ions are arranged in a regular lattice structure.
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محوری لمبائی اور کرسٹل کے یونٹ سیل کے بین محوری زاویوں کو _____ کے نام سے جانا جاتا ہے؟
A. Lattice constants
B. Coordination number
C. Crystal system
D. None of these
Explanation
Lattice constants define the dimensions and angles of a unit cell in a crystal structure. They determine the geometry and symmetry of a crystalline solid. Show/Hide Explanation
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