00:01
The question asks among the potassium compounds, potassium compounds are kcl, kno3, kh and k2 that is potassium chloride, potassium nitrate, potassium hydride and potassium oxide which among these compounds contain both ionic as well as covalent bond in it.
00:37
The correct answer for this is potassium nitrate but let's understand why potassium nitrate is the correct answer.
00:45
So for that let's understand what is an ionic bond.
00:50
So basically ionic bond is formed between metal and a non -metal.
00:56
Metal usually found in s block of the periodic table and non -metals except few are found in t block of the periodic table.
01:09
So here what happens is that metal transfers an electron to a non -metal because metal is electropositive in nature so if we transfer the electron it will become positively charged.
01:23
So metal will become positively charged and non -metal will become negatively charged.
01:29
So there will be a strong force of attraction between them so that attraction leads to a bond called ionic bond.
01:38
So here let's take the options which is given for example kcl.
01:44
So potassium is atomic number 19 so if you write the electronic configuration of potassium it will be 2881.
01:54
So as you can see except octet there is one extra electron which potassium is ready to give to its part that is cl.
02:06
So cl atomic number is 17 so electronic configuration is 287.
02:12
Now cl has one less electron compared to octet.
02:16
So for becoming 8 it needs one electron so that one electron is given by potassium.
02:22
So electron transfer due to which what happens k will be form k plus and cl will become cl minus.
02:31
So there will be strong force of attraction which is nothing but the ionic bond.
02:35
So the only bond present in kcl is ionic so this is not the correct option.
02:41
So next take an example of take the next option that is potassium hydride...