Basic Concepts| First Year Chemistry | Past MCQs | mosaicbro.com

Basic Concepts| First Year Chemistry | Past MCQs

6 of 41 questions (Page 6 of 6)

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36 The number of molecules in one gram atom of CO₂ is:
Correct Answer: A
Explanation: 1 gram atom = 1 mole = 6.02 × 10²³ molecules.
37 Mass of electron is:
Correct Answer: B
Explanation: Electron mass = 9.1095 × 10⁻³¹ kg (or 9.1095 × 10⁻²⁸ g).
38 The number of moles of CO₂ which contain 8.0 grams of oxygen is:
Correct Answer: A
Explanation: 8 g O = 0.5 moles O → 0.25 moles CO₂ (since CO₂ has 2 O atoms).
39 How many isotopes are present in palladium?
Correct Answer: C
Explanation: Palladium has 6 stable isotopes.
40 The chemical analysis in which all the elements present in a compound are identified:
Correct Answer: B
Explanation: Qualitative analysis identifies elements; quantitative measures amounts.
41 Which of the following element can exist in monoatomic form?
Correct Answer: D
Explanation: Noble gases (e.g., He) exist as single atoms.
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