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Q. No.Given below are two statements:
Statement I:
The stability of \(+1\) oxidation state increases down the group in Group-13.
Statement II:
The atomic radius of \(Ga~\) is greater than that of \(Al\).
1.
Statement I is incorrect but Statement II is correct.
2.
Both Statement I and Statement II are incorrect.
3.
Both Statement I and Statement II are correct.
4.
Statement I is correct but Statement II is incorrect.
Subtopic: Boron Family- Preparations, Properties & Uses |
68%
Level 2: 60%+
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Which of the following is not a semiconductor?
1. \(\mathrm{Si}\)
2. Graphite
3. \(\mathrm{CuO}\)
4. \(\mathrm{Ge}\)
1. \(\mathrm{Si}\)
2. Graphite
3. \(\mathrm{CuO}\)
4. \(\mathrm{Ge}\)
Subtopic: Carbon Family - Preparations, Properties & Uses |
58%
Level 3: 35%-60%
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Given below are two statements:
| Statement I: | Gallium (Ga) has a low melting point, so it is used in thermometers. |
| Statement II: | A substance having a melting point of 253 K can be measured by a Gallium thermometer. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are false. |
| 3. | Both Statement I and Statement II are true. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: Boron Family- Preparations, Properties & Uses |
Level 3: 35%-60%
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Given below are two statements:
| Statement I: | Stability of +1 oxidation state increases as Ga< In < Tl |
| Statement II: | Stability of +1 oxidation state increases down the group due to inert pair effect. |
| 1. | Statement I and Statement II both are correct |
| 2. | Statement I and Statement II both are incorrect |
| 3. | Statement I is correct and Statement II is incorrect |
| 4. | Statement I is incorrect and Statement II is correct |
Subtopic: Boron Family- Preparations, Properties & Uses |
94%
Level 1: 80%+
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Given below are two statements:
| Statement I: | Blood acts as a buffer solution, and its pH is maintained at 7.4 by an acidic buffer. |
| Statement II: | The pH of blood is regulated by the presence of bicarbonate ions (\(\text{HCO}_3^-\)) and carbonic acid (\(\text{H}_2\text{CO}_3\)). |
| 1. | Statement I is False but Statement II is True. |
| 2. | Both Statement I and Statement II are False. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Statement I is True but Statement II is False. |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
72%
Level 2: 60%+
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Given below are two statements:
Assertion: Boron is a hard element.
Reason: Boron has an unusually high melting point.
1. Assertion is correct. Reason is correct, and reason explains the assertion.
2. A is correct. R is correct R does not explain A.
3. A is correct, but R is incorrect.
4. A is incorrect, but R is correct.
Assertion: Boron is a hard element.
Reason: Boron has an unusually high melting point.
1. Assertion is correct. Reason is correct, and reason explains the assertion.
2. A is correct. R is correct R does not explain A.
3. A is correct, but R is incorrect.
4. A is incorrect, but R is correct.
Subtopic: Boron Family- Preparations, Properties & Uses |
53%
Level 3: 35%-60%
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Match the following :
1. (A)-(s); (B)-(q); (C)–(r); D-(p)
2. (A)-(q); (B)-(s); (C)–(p); D-(r)
3. (A)-(p); (B)-(q); (C)–(s); D-(r)
4. (A)-(q); (B)-(s); (C)–(r); D-(p)
| Column I (Ores) | Column II (Formula) | ||
| (A) | Fluorspar | (p) | \(\mathrm{Al}_2 \mathrm{O}_3 \cdot 2 \mathrm{H}_2 \mathrm{O}\) |
| (B) | Cryolite | (q) | \(\mathrm{CaF}_2\) |
| (C) | Bauxite | (r) | \(\mathrm{MgCO}_3 \cdot \mathrm{CaCO}_3\) |
| (D) | Dolomite | (s) | \(\mathrm{Na}_3\left[\mathrm{AlF}_6\right]\) |
1. (A)-(s); (B)-(q); (C)–(r); D-(p)
2. (A)-(q); (B)-(s); (C)–(p); D-(r)
3. (A)-(p); (B)-(q); (C)–(s); D-(r)
4. (A)-(q); (B)-(s); (C)–(r); D-(p)
Subtopic: Boron Family- Preparations, Properties & Uses |
83%
Level 1: 80%+
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Given below are two statements:
Statement-1 : Electronegativity of group \(14\) elements decrease from \(\text{Si}\) to \(\text{Pb.}\)
Statement-2 : Group \(14\) has metals, metalloids, and non-metals.
1. Both Statements 1 and 2 are correct
2. Both Statements 1 and 2 are incorrect
3. Statement 1 is correct, and Statement 2 is incorrect
4. Statement 1 is incorrect, and Statement 2 is correct
Statement-1 : Electronegativity of group \(14\) elements decrease from \(\text{Si}\) to \(\text{Pb.}\)
Statement-2 : Group \(14\) has metals, metalloids, and non-metals.
1. Both Statements 1 and 2 are correct
2. Both Statements 1 and 2 are incorrect
3. Statement 1 is correct, and Statement 2 is incorrect
4. Statement 1 is incorrect, and Statement 2 is correct
Subtopic: Carbon Family - Preparations, Properties & Uses |
60%
Level 2: 60%+
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Identify the correct statements for \(\text{B}_2\text{H}_6\) from those given below:
1. (A) and (E) only
2. (B), (C) and (E) only
3. (C) and (D) only
4. (C) and (E) only
| (A) | In \(\text{B}_2\text{H}_6,\) all B-H bonds are equivalent. |
| (B) | In \(\text{B}_2\text{H}_6,\) there are four 3-centre-2-electron bonds. |
| (C) | \(\text{B}_2\text{H}_6\) is a Lewis acid. |
| (D) | \(\text{B}_2\text{H}_6\) can be synthesized from both \(\text{BF}_3\) and \(\text{NaBH}_4.\) |
| (E) | \(\text{B}_2\text{H}_6\) is a planar molecule. |
1. (A) and (E) only
2. (B), (C) and (E) only
3. (C) and (D) only
4. (C) and (E) only
Subtopic: Boron Family- Preparations, Properties & Uses |
53%
Level 3: 35%-60%
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Given below are two statements:
| Statement I: |
The chlorides of beryllium and aluminium have bridged chloride structures, are soluble in organic solvents, and act as Lewis bases. |
| Statement II: |
The hydroxides of beryllium and aluminium dissolve in excess alkali to form beryllate and aluminate ions, respectively. |
| 1. | Both Statement I and Statement II are true |
| 2. | Both Statement I and Statement II are false |
| 3. | Statement I is true but Statement II is false |
| 4. | Statement I is false but Statement II is true |
Subtopic: Anomalous Behaviour of B & C |
Level 3: 35%-60%
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