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.
ڈینیل سیل میں ____ کیتھوڈ کے طور پر استعمال ہوتا ہے۔
A. Pb
B. Cu
C. Zn
D. Sn
Check answer and explanation
Answer: Cu
Explanation In a dry cell , Carbon rod (often with Cu connection) acts as the cathode . While Zinc container serves as the anode . The cathode collects electrons during the electrochemical reaction, completing the circuit.
Explanation One atmospheric pressure , also known as standard atmospheric pressure. It is defined as 101325 Pascals (Pa). This is the pressure exerted by the weight of the atmosphere at sea level. It is used as a standard unit of pressure.
Explanation Chlorine can be displaced by fluorine (F). This is because fluorine is more reactive than chlorine. As halogen reactivity decreases down the group in the periodic table.
مندرجہ ذیل میں سے کون سا خاکہ دکھاتا ہے کہ ایٹم ایک ہی برقی منفیت کے ساتھ جڑے ہوئے ہیں؟
A. A -----:----- B
B. A :---------- B
C. A ----------: B
D. A --:-------- B
Check answer and explanation
Answer: A -----:----- B
Explanation The diagram that shows atoms are bonded with the same electronegativity is: A -----:----- B. In this representation, the bond is shown with a symmetrical distribution of electrons. It suggesting that the atoms have the same or very similar electronegativity.
دو فلورین ایٹم ______ کی الیکٹرانک ترتیب کو حاصل کرنے کے لیے اپنے سب سے بیرونی خول میں ایک ایک الیکٹران کا اشتراک کرتے ہیں؟
A. Ne
B. Kr
C. Xe
D. Ar
Check answer and explanation
Answer: Ne
Explanation Fluorine (F) has an atomic number of 9 and an electronic configuration of 1s² 2s² 2p⁵. To achieve a stable electronic configuration , two fluorine atoms share one electron each to form a covalent bond. Resulting in a configuration similar to that of neon (Ne), which is 1s² 2s² 2p⁶.
گیسوں کی کثافت اس وقت بڑھتی ہے جب اس کا ______ ہے؟
A. Temperature increased
B. None of these
C. Pressure increased
D. Volume increased
Check answer and explanation
Answer: Pressure increased
Explanation When the pressure on a gas increases , the molecules are forced closer together, resulting in a higher density. This is because the volume of the gas decreases as the pressure increases, causing the molecules to be more concentrated.
ہائیڈروجن پیرو آکسائیڈ کا تجرباتی فارمولا _______ ہے؟
A. H2O2
B. OH
C. HO
D. O2H2
Check answer and explanation
Answer: HO
Explanation The empirical formula of hydrogen peroxide (H2O2) is HO . The empirical formula is the simplest whole-number ratio of atoms of each element in a compound. In this case, the ratio of hydrogen to oxygen is 1:1, which is represented by the formula HO.
Explanation Carbon dioxide (CO2) reacts with calcium hydroxide (Ca(OH)2. It is also known as lime water to form a white precipitate of calcium carbonate (CaCO3), which turns the solution milky : Ca(OH)2 + CO2 → CaCO3 + H2O This reaction is often used as a test for carbon dioxide.
Explanation Hydroiodic acid (HI) is the strongest acid. The acidity of hydrohalic acids increases down the group in the periodic table. Due to the decreasing bond strength and increasing bond length.
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