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p-Block Elements – I Chemistry - p-Block Elements – I

Tamil Nadu Board - STD 12 - Chemistry (Tamil - English Medium). 230 questions in this chapter.

Question types

p-Block Elements – I question types

230 questions across 8 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

230
Questions
8
Question groups
5
Question types
Sample Questions

p-Block Elements – I questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 11Assertion And Reason.1 Mark
Assertion (A) – Noble gases are least reactivity.
Reason (R) – Noble gases have completely filled s and p-orbital and attain stable electronic configuration.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.

Answer: A.

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Q 12Assertion And Reason.1 Mark
Assertion (A) – Both boron and silicon form covalent hydrides.
Reason (R) – Boron does not shows diagonal relationship with silicon of group 14.
  • A
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • ✓
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.

Answer: C.

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Q 13Assertion And Reason.1 Mark
Assertion (A) – Fluorine is most reactive element among the halogens.
Reason (R) – Fluorine has minimum bond dissociation energy.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.

Answer: A.

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Q 14Assertion And Reason.1 Mark
Assertion (A) – Boron combines with halogen to form trihalides at high temperatures.
Reason (R) – Boron does not reacts directly with hydrogen.
  • A
    A and R are correct and R explains A.
  • ✓
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.

Answer: B.

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Q 15Assertion And Reason.1 Mark
Assertion (A) – Boron-10 isotope is used as moderator in nuclear reactors.
Reason (R) – Boron has the capacity to absorb neutrons.
  • ✓
    A and R are correct and R explains A.
  • B
    A and R are correct and R not explains A.
  • C
    A is correct but R is wrong.
  • D
    A is wrong but R is correct.

Answer: A.

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Q 28Match The Following.4 Marks
(i) Borax - (a) $Na _2 B _4 O _7$
(ii) Prismatic form - (b) $Na _2 B _4 O _7. 5 H _2 O$
(iii) Jeweller borax - (c) $Na _2 B _4 O _7. 10 H _2 O$
(iv) Borax glass - (d) $\left[ B _4 O _5( OH )_4\right]_2$
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Q 34[ 3 Marks Questions ]3 Marks
1. Linear silicones - They are obtained by the hydrolysis and subsequent condensation of dialkyl or diaryl silicon chlorides.
- Silicone rubbers - These silicones are bridged together by methylene or similar groups.
- Silicone resins - They are obtained by blending silicones with organic resins such as acrylic esters.
2. Cyclic silicones - These are obtained by the hydrolysis of $R _2 SiCl _2$.
3. Cross linked silicones - They are obtained by hydrolysis of RSiClr
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