|Description: Hydrogen, s-and p-Block Elements|
|Number of Questions: 15|
|Created by: Seema Agrawal|
|Tags: Hydrides Alkaline Earth Metals Group 13 Elements Group 16 Elements Alkali Metals (Group-1) Alkali Metals Group 15 Elements s-Block Elements S-Block Elements s-and p-Block Elements|
When 1 mole of Mg3N2 is dissolved in water, it releases
Two moles of ammonia gas are released.
In hypophosphorous acid, number of hydrogen atom(s) attached to phosphorus atom after ionisation in water is
True statement. Out of 3 , only one H atom is ionisable. Rest 2 are permanently attached to P atom.
Identify the correct statement.
Polarity along O-H in HNO3 is more in comparision to that in HNO2.
Identify the amphoteric compound.
SnO2 in base forms SnCl4 and in acid forms SnO32-.
Which of the following fertilisers is used to increase the acidity of soil?
Ammonium ion (NH4)+ is acidic in nature.
What is the reason for using alum for purifying the water?
Mud is colloidal charged solution which on treatment with Alum (Al3+) gets neutralised or coagulated.
After reaction with potassium iodide and copper sulphate, sodium thiosulphate solution is added. Find the incorrect statement about this reaction.
When KI is added to the solution of cupper sulphate, an equivalent amount of I2 is liberated along with the formation white precipitate (of Cu2I2). This free iodine (I2), which remains in solution as [KI3] complex is then titrated with sodium thiosulphate solution using starch as indicator. At the end point of the titration, the blue colour of solution will disappear and a white precipitate of the Cu2I2 will remain in conical. The reactions that are taking place are:
Glass is categorised as
Glass is a supercooled liquid, which forms a non-crystalline solid. The common lime-soda glass used for bottles and jars is a super cooled mixture of sodium and calcium silicates.
Which property differs Be and Al from each other?
Be, Z = 4 has maximum covalency of 4 while Al, Z = 13 has maximum covalency of 6.
In which of the following is hard water produced?
Ca and Mg soluble sulphates and chlorides cause permanent hardness.
When small amount of sodium oxide is dissolved in water, then
Oxide ion donates a pair of electrons, thus changes to hydroxide ion.
Lithium nitrate on heating forms
Correct statement. It forms lithium oxide, nitrogen dioxide and oxygen gas.
Which of the following anions of boron is not possible?
Due to absence of 2d-orbitals, the maximum covalency is four.
Which of the following information about sulphur is incorrect?
Oxidation states of sulphur are - 2, 0, + 2, + 4, + 6. Valency can be less than 4. Incorrect statement
Identify the wrong statement.
Thermal stability of hydrides decreases as we go down the group. Hence, this option is correct.