Match the following:

Element Biological Significance
(a) Sodium (i) Oxidation of glucose to produce ATP.
(b) Potassium  (ii) Helps in transporting sugars and amino acids into the cells.
(c) Magnesium (iii) Helps in the coagulation of blood.
(d) Calcium (iv) Helps in building and strengthening bones.
 
(a) (b) (c) (d)
1. (ii) (i) (iv) (iii)
2. (i) (ii) (iii) (iv)
3. (iv) (ii) (i) (iii)
4. (iii) (i) (iv) (iii)

Subtopic:  Biological Importance of S Block Elements and & Its Ore |
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Sodium hydroxide can be prepared by:

1. Down's Process.

2. Castner–Kellner process.

3. Solvay's Process.

4. None of the above.

Subtopic:  Chemical Properties | Preparations, Properties & Uses of S Block Elements |
 77%
From NCERT
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The correct statement(s) among the following options is/are:

1. Sodium metal reacts violently with water.
2. Sodium metal is heated in a free supply of air to give sodium peroxide.
3. Sodium peroxide is dissolved in water to give sodium hydroxide.
4. All of the above.

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 91%
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The correct statement(s) among the following options is/are:

1. BeO is almost insoluble but BeSO4 is soluble in water.
2. BaO is soluble but BaSO4 is insoluble in water.
3. LiI is more soluble than KI in ethanol.
4. All of the above.

Subtopic:  Chemical Properties | Reasoning Questions |
 71%
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Quick lime is heated with silica to give:

1. CaSiO3

2. CaSiO4

3. CaSiO

4. Ca(SiO)3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 66%
From NCERT
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The incorrect statement among the following is -

1. The thermal stability of nitrates of groups 1 and 2 increases down the group.
2. Nitrates of both groups 1 and 2 are insoluble in water.
3. The solubility of alkali metal carbonates increases down the group.
4. The solubility of alkaline earth metals sulphates decreases down the group.

Subtopic:  Chemical Properties |
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The incorrect statement among the following is-

1. Ionisation enthalpy of alkaline earth metals is higher than alkali metals.
2. Alkaline earth metal oxides are more basic than alkali metal oxides.
3. Alkaline earth metal hydroxides are less basic and less stable than alkali metal hydroxides.
4. Solubility of Alkaline earth metals and alkali metal hydroxide increases down the group.

Subtopic:  Physical Properties |
 70%
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The incorrect statement among the following regarding alkaline earth metals is : 

1. Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals.
2. Only Ca, Sr, Mg, and Ba give a flame test.
3. Alkaline earth metals have high electrical, and thermal conductivities.
4. All alkaline earth metals react with halogen and form metal halides, with the general formula  MX2 .

Subtopic:  Physical Properties |
 75%
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The incorrect reaction among the following is:

1. Na2O2(s) + 2H2O(l) → 2NaOH(aq) + H2O2(g)
2. 2KO2(s) + 2H2O(l) → 2KOH(aq) + H2O2(aq) + O2(g)
3. Na2O(s) + CO2(g) → NaHCO3 (s) + H2O2(aq)
4. Na2O(s) + CO2(g) → Na2CO3 (s)

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 69%
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LiF is almost insoluble in water whereas LiCl is soluble in water and acetone both, because of:

1. Greater covalent character of LiCl as compared to LiF.
2. Greater hydration energy of  LiF as compared to LiCl.
3. Greater size of LiF as compared to LiCl.
4. Greater lattice energy of LiF as compared to LiCl.

 

Subtopic:  Chemical Properties | Reasoning Questions |
 57%
From NCERT
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