Which of the following statements is false?
 

1. Ca2+ ions are important in blood clotting
2. Ca2+ ions are not important in maintaining the regular beating of the heart
3. Mg2+ ions are important in the green parts of plants
4. Mg2+ ions form a complex with ATP

Subtopic:  Biological Importance of S Block Elements and & Its Ore |
 78%
From NCERT
NEET - 2016
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Which of the following biologically important ions is also a constituent of the sodium pump?

1. Ca2+
2. Mg2+
3. K+
4. Fe2+

Subtopic:  Biological Importance of S Block Elements and & Its Ore |
 89%
From NCERT
NEET - 2015
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Solubility of alkaline earth metal sulphates in water decreases in the sequence:

1. Mg > Ca > Sr >Ba
2. Ca > Sr > Ba > Mg
3. Sr > Ca > Mg > Ba
4. Ba > Mg > Sr > Ca

Subtopic:  Chemical Properties |
 76%
From NCERT
NEET - 2015
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Which one of the following alkali metals forms only the normal oxide M2O on heating in air?

1. Rb

2. K

3. Li

4. Na

Subtopic:  Chemical Properties |
 89%
From NCERT
AIPMT - 2012
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Which one of the following compounds is a peroxide?

1. KO2

2. BaO2

3. MnO2

4. NO2

Subtopic:  Chemical Properties |
 58%
From NCERT
AIPMT - 2010
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An oxide that does not react with sodium hydroxide is:
1. B2O3
2. CaO
3. SiO2
4. BeO
Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 57%
From NCERT
AIPMT - 2009
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The correct order of the mobility of the alkali metal ions in aqueous solution is:

1. Li+>Na+>K+>Rb+

2. Na+>K+>Rb+>Li+

3. K+>Rb+>Na+>Li+

4. Rb+>K+>Na+>Li+

Subtopic:  Chemical Properties |
 70%
From NCERT
AIPMT - 2006
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The product obtained as a result of a reaction of nitrogen with CaC2 is:

1. CaCN
2. CaCN3
3. Ca2CN
4. CaCN2

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 57%
NEET - 2016
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The commercial method of preparation of potassium by reduction of molten KCl with metallic sodium at 850°C is based on the fact that -

1. Potassium is solid and sodium distils off at 850 °C.

2. Potassium is more volatile and distils off thus shifting the reaction forward.

3. Sodium is more reactive than potassium at 850 °C.

4. Sodium has less affinity to chloride ions in the presence of potassium ions.

Subtopic:  Chemical Properties |
 56%
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A paramagnetic compound among the following is -

1. K2O

2. K2O2

3. Na2O2

4. RbO2

Subtopic:  Physical Properties |
 54%
From NCERT
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