Chemistry Mcqs XII [300 MCQS All Chapters] Online Test 8

XII Chemistry Online Mcqs - All Chapters - Online Mcqs Test - 8

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

Q1. The elements which belong to group IIIA to group VIIIA are called

• s - block elements
• p - block elements
• d - block elements
• f - block elements

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Q2. All elements of group IIIA show high covalency due to

• Small size
• High charge
• Large value of ionization potential
• All

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Q3. The formula of borax is

• Na₂B₄O₇
• Na₂B₄O₇.5H₂O
• Na₂B₄O7.₇H₂O
• Na₂B₄O₇. 10H₂O

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Q4. The formula of orthoboric acid is

• HBO₂
• HBO₃
• H₂BO₃
• H₃BO₃

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Q5. Which elements exhibit allotropy?

• Li
• Na
• P and S
• B

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Q6. Bauxite, Cryoiite and Alunite are ores of

• Barium
• Calcium
• Copper
• Aluminum

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Q7. Bayer’s process is used for the purification of

• Cryolite
• Bauxite
• Alum stone
• Beryl

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Q8. When aluminum is added to potassium hydroxide solution

• No action takes place
• Oxygen is evolved
• Water is produced
• Hydrogen is evolved

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Q9. In the Hall - Beroult process for producing aluminum the substance produced at the cathode is

• Al
• Al203
• F₂
• C

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Q10. Na₃AIF₆ is called

• Bauxite
• Cryolite
• Alum stone
• Alunite

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