Chemistry Mcqs XII [300 MCQS All Chapters] Online Test 3

XII Chemistry Online Mcqs - All Chapters - Online Mcqs Test - 3

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

Q1. The trend of change in melting points and boiling points of elements in the period from left to right is graded

• Increase
• First increase then decrease
• Decrease
• First decrease then increase

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Q2. Which of the following is the general electronic configuration of transition elements?

• ns², np⁶, nd¹⁰
• (n - 1 )^d1-10, ns², np⁶
• ns², np⁶, nd¹⁰
• (n- 1)^d1-10, ns²

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Q3. Which of the following ions has the smallest radius?

• Cl
• S₂
• K+
• Ca²⁺

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Q4. Large amounts of atomic hydrogen are present in the atmosphere

• Earth
• Sun
• Moon
• None

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Q5. Chemical formula of heavy water is

• H₂O
• D₂O
• DO₂
• None

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Q6. Hydrogen resembles with

• Alkali metals
• Halogens
• Group - IV elements
• All

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Q7. Hydrogen was first prepared by Cavendish in 1766 by the action

• Zn + HCl
• Zn + NaOH
• Zn+NaNo₃
• All

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Q8. Hydrogen is a very good

• Reducing agent
• Oxidizing agent
• Reducing agent as well as oxidizing agent
• None

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Q9. Hydrogen at the time of its generation during chemical reaction is in the form of atomic state and is called

• Ionic hydrogen
• Nascent hydrogen
• Atomic hydrogen
• None

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Q10. Permanent hardness of water is due to

• Sulphates of Na and K
• Sulphates of Mg and Ca
• Bicarbonates of Mg and Ca
• None

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Finish!

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