A paramagnetic compound among the following is -
1.
2.
3.
4.
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.
The product obtained as a result of a reaction of nitrogen with CaC2 is:
1. CaCN
2. CaCN3
3. Ca2CN
4. CaCN2
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 |
Which of the following biologically important ions is also a constituent of the sodium pump?
1. Ca2+
2. Mg2+
3. K+
4. Fe2+
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
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
Which one of the following compounds is a peroxide?
1.
2.
3.
4.
The correct order of the mobility of the alkali metal ions in aqueous solution is:
1.
2.
3.
4.