Chemistry Class 9th MCQs MCQs - General Science Practice | PakExamPoint
Practise Chemistry Class 9th MCQs MCQs in General Science. Attempt multiple-choice questions, check answers and revise related subtopics.
Chemistry Class 9th MCQs MCQs and revision practice
Study Chemistry Class 9th MCQs through multiple-choice questions in General Science. This subtopic contains 95 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.
Use these Chemistry Class 9th MCQs MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.
کمرے کے درجہ حرارت پر زیادہ تر آئنک مرکبات ______ ہیں؟
A. Amorphous solids
B. Liquids
C. Crystalline solids
D. Gases
Check answer and explanation
Answer: Crystalline solids
Explanation At room temperature , most ionic compounds are crystalline solids, meaning they have a rigid and orderly crystal structure. This is because the strong electrostatic forces between the oppositely charged ions hold them in a fixed position, creating a three-dimensional lattice.
Explanation A 10% (w/w) sugar solution means that 10 grams of sugar (the solute) is dissolved in 90 grams of water (the solvent), making a total of 100 grams of solution. The percentage is calculated as : (10 g sugar / 100 g total) × 100% = 10% (w/w) So, 10 grams of sugar is dissolved in 90 grams of water.
ایک فارمولہ جو کسی مالیکیول میں ایٹموں کی اصل تعداد اور قسم کی نشاندہی کرتا ہے ____ کہلاتا ہے؟
A. Empirical formula
B. Formula mass
C. Molecular formula
D. Chemical formula
Check answer and explanation
Answer: Molecular formula
Explanation A molecular formula is a chemical formula that shows the actual number and type of atoms in a molecule. It is a way to represent the composition of a molecule using symbols and numbers. For example: Water: H2O ( two hydrogen atoms and one oxygen atom)
Explanation Chlorine (Cl2) is a strong oxidizing agent , which means it can accept electrons from other substances and cause them to be oxidized. Chlorine is a powerful oxidizer and is often used as a disinfectant or bleach.
Explanation Group IIIA (or group 13) elements , such as boron (B), aluminum (Al), and gallium (Ga), lose three electrons to form ions with a charge of +3. This means that they typically form compounds by losing three electrons, resulting in a valency of +3.
Explanation The L shell, also known as the second electron shell , has 02 subshells: The L shell contains two subshells - 2s, 2p. The M shell contains three subshells - 3s, 3p, 3d. The N shell contains four subshells - 4s, 4p, 4d, 4f
Explanation The shielding effect decreases across a period. This is because the increasing nuclear charge is not fully counterbalanced by the same number of inner electrons, resulting in a weaker shielding effect.
اگر پروٹون نمبر 19 ہے تو الیکٹران کی ترتیب ______ ہوگی؟
A. 2, 8, 9
B. 2, 8, 8, 1
C. 2, 8, 3
D. 2, 8, 1
Check answer and explanation
Answer: 2, 8, 8, 1
Explanation The atomic number 19 corresponds to the element Potassium (K). The electron configuration of Potassium is : 1s² 2s² 2p⁶ 3s¹ Which can be simplified to: 2, 8, 8, 1 .
Explanation An example of a true solution is Ink in water. In a true solution, the solute particles are completely dissolved and cannot be seen or separated by filtration , which is characteristic of ink dissolved in water.
جو ایٹم اپنے بیرونی خول سے دو الیکٹران کھو کر آئن بناتا ہے اسے _____ کہتے ہیں؟
A. Magnesium
B. Potassium
C. Carbon
D. Oxygen
Check answer and explanation
Answer: Magnesium
Explanation Magnesium (Mg) is an alkaline earth metal that loses two electrons from its outer shell to form a divalent cation (Mg²⁺). This means that it typically loses two electrons to form compounds, resulting in a valency of +2.
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