Q21. Which pair of atoms has the highest electronegativity difference? (Calcium's electronegativity is 1.0 Fluorine's electronegativity is 4.0 Hydrogen's electronegativity is 2.2 Sodium's electronegativity is 0.93)

A) Ca-F

B) F-F

C) Na-F

D) H-F

✔ Correct Answer: Na-F

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Q22. Which one of the following is not a mixture

A) mercury

B) air

C) cement

D) milk

✔ Correct Answer: mercury

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Q23. Silver Mirror test is given by which one of the following compounds?1. Benzophenone2. Acetaldehyde3. Acetone4. Formaldehyde

A) Only 2

B) Only 1

C) 2 and 4

D) 1 and 3

✔ Correct Answer: 2 and 4

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Q24. Which of the following is a non metal that remains liquid at room temperature  ?

A) Phosphorous

B) Chlorine

C) Helium

D) Bromine

✔ Correct Answer: Bromine

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Q25. The maximum number of electrons that can be accommodated in a shell depends on the formula

A) n2

B) 1n2

C) 2n2

D) 3n2

✔ Correct Answer: 2n2

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Q26. Boron cannot form which one of the following anions?(1) BO2-(2) BF63-(3) BH4-(4) B(OH)4-

A) Option 2

B) Option 1

C) Option 4

D) Option 3

✔ Correct Answer: Option 2

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Q27. Hydrogen bomb is based on the principle of

A) nuclear fusion

B) nuclear fission

C) artificial radioactivity

D) natural radioactivity

✔ Correct Answer: nuclear fusion

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Q28. Among the following the maximum covalent character is shown by the compound(1)MgCl2(2)FeCl2(3)SnCl2(4) AlCl3

A) Option 2

B) Option 1

C) Option 4

D) Option 3

✔ Correct Answer: Option 4

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Q29. Which of the following is NOT a property of bases?

A) They turn red litmus blue

B) They react with acids and neutralise them

C) They have bitter taste

D) They turn blue litmus red

✔ Correct Answer: They turn blue litmus red

View Explanation →
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