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.
گرم ہونے پر کے سی ایل کا سیر شدہ محلول _______ ہو جاتا ہے؟
A. All of these
B. Unsaturated
C. Diluted
D. Supersaturated
Check answer and explanation
Answer: Supersaturated
Explanation When a saturated solution of KCl (potassium chloride) is heated , the solubility of KCl increases, allowing more KCl to dissolve in the solution. If the solution is heated to a temperature where all the KCl dissolves, it becomes a supersaturated solution. A supersaturated solution contains more dissolved solute than it can hold at a given temperature, making it unstable.
Explanation Steel is an alloy of iron (Fe) and carbon (C) , with small amounts of other elements like manganese, chromium, and vanadium. It's a mixture of two or more elements , where at least one is a metal, making it an alloy.
اگر پوٹاشیم کا نیوکلیون نمبر 39 ہے تو نیوٹران کی تعداد _______ ہوگی؟
A. 19
B. 20
C. 29
D. 39
Check answer and explanation
Answer: 20
Explanation The nucleon number (mass number) of Potassium is 39, and the atomic number (number of protons) is 19. To find the number of neutrons, subtract the number of protons from the nucleon number: 39 (nucleon number) - 19 (proton number) = 20 So, the number of neutrons in Potassium-39 is 20.
محلولیت کا اظہار عام طور پر سالوینٹ کے ________ گرام میں تحلیل ہونے والے محلول کے گرام میں ہوتا ہے۔
A. 100 grams
B. 10 grams
C. 1000 grams
D. 500 grams
Check answer and explanation
Answer: 100 grams
Explanation Solubility is typically expressed in grams of solute per 100 grams of solvent, denoted as g/100g or g/100mL. This unit is called the percentage concentration or percentage composition.
Explanation NaCl 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 (an anion). Formula: NaCl Molar mass: 58.44 g/mol IUPAC ID: Sodium chloride Melting point: 801 °C Soluble in: Water, Ammonia, Ethanol, Glycerol, Methanol, Propylene glycol, Formic acid, Formamide Classification: Salt Boiling point: 1,465 °C
Explanation The equivalent weight of an element is the mass of the element that reacts with one mole of electrons (or one mole of hydrogen atoms). For aluminum (Al), the equivalent weight is 9 g. Atomic weight of Al = 27 g/mol Valency of Al = 3 (since Al forms Al3+ ions) Equivalent weight = Atomic weight / Valency = 27 g/mol / 3 = 9 g So, 1 g equivalent weight of Al is 9 g!
مائع کے مالیکیول بخارات کے عمل میں مائع کی سطح کو چھوڑ دیتے ہیں کیونکہ ______؟
A. Energy is high
B. None of these
C. Energy is low
D. Energy is moderate
Check answer and explanation
Answer: Energy is high
Explanation In the evaporation process , liquid molecules gain energy and move faster. It allowing them to escape from the surface of the liquid into the surrounding air. This occurs when the molecules have enough energy to overcome the intermolecular forces holding them to the surface.
مندرجہ ذیل میں سے کون سا پانی کے ساتھ کمزور الیکٹرولائٹ محلول بناتا ہے؟
A. None of these
B. H₂SO₄
C. CH₃COOH
D. NaCl
Check answer and explanation
Answer: CH₃COOH
Explanation Acetic acid (CH3COOH) is a weak acid that only partially dissociates in water, forming a weak electrolyte solution. It does not fully dissociate into ions like strong acids (like HCl) or strong bases (like KOH).
مصنوعی رالیں ان جگہوں پر استعمال ہوتی ہیں جہاں _______؟
A. Water resistance is required
B. Friction is required
C. Electric resistance is required
D. Adhesion is required
Check answer and explanation
Answer: Adhesion is required
Explanation Synthetic resins are used in places where adhesion is required. They provide strong bonding properties , making them ideal for coatings, glues, and composite materials.
ایٹموں کا اپنے والینس شیل میں آٹھ الیکٹران حاصل کرنے کا رجحان ______ ہے؟
A. Triplet rule
B. Duplet rule
C. Octet rule
D. None of above
Check answer and explanation
Answer: Octet rule
Explanation The octet rule states that atoms tend to gain , lose, or share electrons to achieve a full outer energy level, which typically corresponds to eight electrons in the valence shell. This rule is a fundamental principle in chemistry and is used to explain the formation of chemical bonds and the structure of molecules.
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