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A. sp^3 d
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B. None of these
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C. sp^3
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D. sp^2
Explanation
- In BH₃, boron forms three sigma bonds with hydrogen and has no lone pairs, leading to sp² hybridization.
- The molecular geometry is trigonal planar, with 120° bond angles.
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A. Tetrahedral, sp^3
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B. Linear, sp
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C. Trigonal planner, sp^2
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D. None of these
Explanation
- In BF₃, boron forms three sigma bonds with fluorine, adopting sp² hybridization.
- The molecular geometry is trigonal planar with a 120° bond angle.
مندرجہ ذیل میں سے کون سا سپیکٹروسکوپی 7 ای وی کے توانائی کے ذریعہ استعمال کرتا ہے؟
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A. UV (Ultraviolet) spectroscopy
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B. Infrared
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C. Emission spectroscopy
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D. None of these
Explanation
- UV spectroscopy typically uses energy in the range of 3–7 eV.
- This making it suitable for electronic transitions.
- It is widely used to analyze molecular structures and detect conjugated systems.
لوہے کا ایک ایٹم ______ بار ہے جس میں ہائیڈروجن کے ایٹم کی طرح بھاری ہے۔
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A. None of these
-
B. 238
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C. 55
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D. 1638
Explanation
- The atomic mass of iron (Fe) is approximately 55, while the atomic mass of hydrogen (H) is about 1.
- Therefore, an iron atom is roughly 55 times heavier than a hydrogen atom.
کی وجہ سے میتھین پانی میں قدرے گھلنشیل ہے؟ _____
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A. Non-polar nature
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B. None of these
-
C. Polar nature
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D. Ionic nature
Explanation
- Methane is non-polar, which reduces its solubility in water, a polar solvent.
- Despite its non-polarity, methane's slight solubility is due to weak London dispersion forces between molecules.
کتنے گندھک کے جوہری ایک رنگ کی انگوٹھی میں موجود ہیں؟
-
A. 4
-
B. 6
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C. None of these
-
D. 8
Explanation
Key points:
Chemical formula: S8
Structure: Puckered ring
Number of atoms: 8
Explanation
The human body contains traces of many elements, and approximately 99% of its mass is comprised of just six essential elements:
- oxygen
- carbon
- hydrogen
- nitrogen
- calcium
- phosphorus
Another five elements—
- sulfur
- potassium
- sodium
- chlorine
- magnesium
Make up about 0.85% of the remaining mass, bringing the total of essential elements to 11
دو مونوساکرائیڈز کے درمیان بننے والے بانڈ کو کہتے ہیں؟
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A. Peptide bond
-
B. Glycosidic bond
-
C. Hydrogen bond
-
D. Phosphodiester bond
Explanation
Monosaccharides are the building blocks of disaccharides (such as sucrose, lactose, and maltose) and polysaccharides (such as cellulose and starch).
A glycosidic bond is a covalent bond that connects two monosaccharides to form a disaccharide or polysaccharide.
Glycosidic bonds (also called glycosidic linkages) can be of the alpha or the beta type.
-
A. Sugar + Phosphate
-
B. Base + Sugar
-
C. Base + Phosphate
-
D. Sugar + Phosphate + Base
Explanation
A nucleoside is composed of a Base + Sugar.
A nucleoside is a molecule made up of a nitrogenous base (like adenine, guanine, cytosine, or thymine)
Attached to a five-carbon sugar (ribose or deoxyribose).
It lacks the phosphate group that is found in a nucleotide.
-
A. Hydrogen bonds
-
B. Phosphodiester bonds
-
C. Peptide bonds
-
D. Glycosidic bonds
Explanation
On a DNA strand, nucleotides are linked together by phosphodiester bonds.
These bonds connect the 5' carbon of one nucleotide's sugar to the 3' carbon of the next nucleotide's sugar, forming a chain.
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