Q. No.The order of decreasing ionisation enthalpy in alkali metals is
1. Na>Li>K>Rb
2. Rb<Na<K<Li
3. Li>Na>K>Rb
4. K<Li<Na<Rb
The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to -
1. Ionic nature of lithium fluoride
2. High lattice enthalpy
3. High hydration enthalpy for lithium ion
4. Low ionisation enthalpy of lithium ion
Amphoteric hydroxides react with both alkalies with acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
1.
2.
3.
4.
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating with . The by-product obtained in this process is
1.
2.
3.
4.
When sodium is dissolved in liquid ammonia, a solution of deep blue color is obtained. The color of the solution is due to
1. Ammoniated electron
2. Sodium ion
3. Sodium amide
4. Ammoniated sodium ion
By adding gypsum to cement
1. Setting time of cement becomes less
2. Setting time of cement increases
3. Colour of cement becomes light
4. Shining surface is obtained
Suspension of slaked lime in water is known as
1. Lime water
2. Quick lime
3. Milk of lime
4. Aqueous solution of slaked lime
Which of the following elements does not form hydride by direct heating with dihydrogen?
1. Be
2. Mg
3. Sr
4. Ba
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