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NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test

NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test is an online chapter test in the NEET UG pattern, covering Basic Concepts & Atomic Structure. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.

20
Questions
20
Minutes
20
Marks
−0.25
Negative marking

Topics in this test

TopicQuestions
Basic Concepts & Atomic Structure20

Difficulty: 8 medium · 12 hard

Some Basic Concepts of Chemistry MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

  1. Q1. Arrange the following laws in the chronological order in which they were formulated: A. Law of conservation of mass B. Law of definite proportions C. Law of multiple proportions D. Avogadro's law.

    निम्नलिखित नियमों को उस कालक्रम में व्यवस्थित कीजिए जिसमें इन्हें प्रतिपादित किया गया था: A. द्रव्यमान संरक्षण का नियम B. निश्चित अनुपात का नियम C. गुणित अनुपात का नियम D. आवोगाद्रो का नियम।

    • A. B, A, C, D
    • B. A, C, B, D
    • C. A, B, C, D
    • D. D, C, B, A
    Solution

    Lavoisier's law of conservation of mass (1789) came first, then Proust's law of definite proportions (1799), Dalton's law of multiple proportions (1803) and finally Avogadro's law (1811).

    लैवोज़िए का द्रव्यमान संरक्षण का नियम (1789) सबसे पहले आया, फिर प्राउस्ट का निश्चित अनुपात का नियम (1799), डाल्टन का गुणित अनुपात का नियम (1803) तथा अंत में आवोगाद्रो का नियम (1811)।

  2. Q2. The total number of ions present in 0.50 mol of aluminium sulphate, Al₂(SO₄)₃, is (Avogadro number = 6.022 × 10²³)

    0.50 मोल ऐलुमिनियम सल्फेट, Al₂(SO₄)₃, में उपस्थित आयनों की कुल संख्या है (आवोगाद्रो संख्या = 6.022 × 10²³)

    • A. 3.01 × 10²³
    • B. 6.022 × 10²³
    • C. 3.0 × 10²³
    • D. 1.5 × 10²⁴
    Solution

    Each formula unit of Al₂(SO₄)₃ gives 2 Al³⁺ + 3 SO₄²⁻ = 5 ions, so 0.50 mol yields 2.5 mol of ions = 2.5 × 6.022 × 10²³ ≈ 1.5 × 10²⁴ ions.

    Al₂(SO₄)₃ की प्रत्येक सूत्र इकाई 2 Al³⁺ + 3 SO₄²⁻ = 5 आयन देती है, अतः 0.50 मोल से 2.5 मोल आयन प्राप्त होते हैं = 2.5 × 6.022 × 10²³ ≈ 1.5 × 10²⁴ आयन।

  3. Q3. A solution contains 2.5 g of a solute dissolved in enough water to give 50 kg of solution. The concentration of the solute in parts per million (ppm) by mass is

    एक विलयन में 2.5 g विलेय पर्याप्त जल में घुला हुआ है जिससे 50 kg विलयन प्राप्त होता है। विलेय की सांद्रता द्रव्यमान के अनुसार प्रति मिलियन भाग (ppm) में है

    • A. 25 ppm
    • B. 100 ppm
    • C. 50 ppm
    • D. 5 ppm
    Solution

    ppm by mass = (mass of solute / mass of solution) × 10⁶ = (2.5 / 50000) × 10⁶ = 50 ppm.

    द्रव्यमान के अनुसार ppm = (विलेय का द्रव्यमान / विलयन का द्रव्यमान) × 10⁶ = (2.5 / 50000) × 10⁶ = 50 ppm।

Frequently asked questions

How many questions are in the NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test?

20 questions for 20 marks, to be answered in 20 minutes.

Is there negative marking in the NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test?

Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.

Which topics does the NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test cover?

Basic Concepts & Atomic Structure (20 questions).

Is the NEET UG Basic Concepts & Atomic Structure: Some Basic Concepts of Chemistry – Chapter Test free?

It is part of the NEET UG 2027 Mock Test Series (134 tests, ₹299). You can first try Biology in Human Welfare – Topic Test for free.

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