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Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic. |
| Reason (R): | The deep blue solution is due to the formation of amide. |
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true and R is NOT the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Subtopic: Reasoning Questions |
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Which one of the following statements is correct?
| 1. | Mg plays role in neuromuscular function and interneuronal transmission. |
| 2. | The daily requirement of Mg and Ca in the human body is estimated to be 0.2-0.3 g. |
| 3. | All enzymes that utilize ATP in phosphate transfer require Ca as the cofactor. |
| 4. | The bone in the human body is an inert and unchanging substance. |
Subtopic: Biological Importance of S Block Elements and & Its Ore |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | Lithium and beryllium unlike their other respective group members form compounds with pronounced ionic character |
| Reason (R): | Lithium and Magnesium have similar properties due to a diagonal relationship |
| 1. | (A)is true but (R) is false |
| 2. | (A) is false but (R) is true |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
Subtopic: Preparations, Properties & Uses of S Block Elements |
From NCERT
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Statement-I is correct but Statement-II is false.
2. Statement-I is incorrect but Statement-II is true.
3. Both Statement-I and Statement-II are true.
4. Both Statement-I and Statement-II are false.
| I: | Hydrated chlorides and bromides of Ca, Sr and Ba on heating undergo hydrolysis. |
| II: | Hydrated chlorides and bromides of Be and Mg on heating dehydration. |
In the light of the above statements, choose the correct answer from the options given below:
1. Statement-I is correct but Statement-II is false.
2. Statement-I is incorrect but Statement-II is true.
3. Both Statement-I and Statement-II are true.
4. Both Statement-I and Statement-II are false.
Subtopic: Preparations, Properties & Uses of S Block Elements |
From NCERT
NEET - 2023
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Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (a) | Li | (i) | absorbent for carbon dioxide |
| (b) | Na | (ii) | electrochemical cells |
| (c) | KOH | (iii) | coolant in fast breeder reactors |
| (d) | Cs | (iv) | photoelectric cell |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (i) | (iv) |
| 2. | (iv) | (i) | (iii) | (ii) |
| 3. | (iii) | (iv) | (ii) | (i) |
| 4. | (i) | (iii) | (iv) | (ii) |
Subtopic: Preparations, Properties & Uses of S Block Elements |
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LiF is sparingly soluble in water because it has:
1. partial covalent character.
2. small electronegativity.
3. high lattice enthalpy.
4. low hydration enthalpy.
Subtopic: Reasoning Questions |
67%
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Alkali metals, though white, impart characteristic color to the flame because of
| 1. | excitation and coming back of valence electrons to the original level. |
| 2. | oxidation of metal in the presence of flame. |
| 3. | excitation of valence electrons. |
| 4. | gain of electrons. |
Subtopic: Physical Properties |
72%
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CaCl2 and Ca(OCI)2 are components of:
1. gypsum
2. Portland cement
3. bleaching powder
4. lime water
1. gypsum
2. Portland cement
3. bleaching powder
4. lime water
Subtopic: Compounds of Ca and Na -Preparations, Properties & Uses |
77%
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Among the following alkaline earth metal halides, the one which is covalent and soluble in organic solvents is:
1. Magnesium chloride
2. Beryllium chloride
3. Calcium chloride
4. Strontium chloride
Subtopic: Chemical Properties |
75%
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The structures of beryllium chloride in solid-state, and vapor state are :
1. Dimer, and Linear, respectively.
2. Chain in both.
3. Chain, and dimer, respectively.
4. Linear in both.
Subtopic: Reasoning Questions |
68%
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