Chemistry Mcqs XII [300 MCQS All Chapters] Online Test 1

XII Chemistry Online Mcqs - All Chapters - Online Mcqs Test - 1

Chemistry Online Mcqs Test for class 12, Second Year, According to Karachi Board 300 Online Multiple Choice Questions

Q1. How many elements have been discovered so far?

• 100
• 110
• 120
• 150

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Q2. Which of the following discovery resulted in a revision of the Mendeleev’s periodic law?

• The nucleus of atom by Rutherford
• The elements polonium and radium by the curies
• Atomic numbers by Moseley
• X - Rays by Roentgen

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Q3. Who classified the then known elements into metals, nonmetals and their derivatives

• Doberenier
• Al-Razi
• Newland’s
• Mendeleev

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Q4. In 1829, a German chemist, ____made use of the idea of relationship between atomic weights and properties of elements for the classification of elements.

• Doberenier
• Al-Razi
• Newland’s
• Mendeleev

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Q5. The law of octaves was given by

• Doberenier
• AI-Razi
• Newland’s
• None

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Q6. “Physical and chemical properties of elements are periodic functions of their atomic weight”. This is called

• Doberenier’s law of Traids
• Newlands law of Octaves
• Mendeleev’s Periodic law
• None

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Q7. Lother Mayer arranged the elements in order of their increasing atomic weights and found that

• Physical properties of the elements were the periodic function of their atomic weights.
• Chemical properties of the elements were the periodic function of their atomic number
• Physical properties of the elements were the periodic function of their atomic number.
• Chemical properties of the elements were the periodic function of their atomic weights.

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Q8. Modern classification of elements is based on

• Doberenier’s law of Traids
• Newlands’s law of Octaves
• Mendeleev’s Periodic law
• None

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Q9. Which property is same in elements of same group of periodic table?

• Ionization potential
• Electro negativity
• Electron affinity
• Number of valance electrons

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Q10. The valency, ionization energy, electron affinity and electro negativity of elements are related to its

• Atomic size
• Properties
• Atomic weight
• Family group

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