please solve all these(will mark brainlist)
Answers
Answer:
Q 1) (2) (a) and (c)
Q 2)(d)Cl, Br, I
Q 3)X is copper(Cu)
The black compound formed is Copper oxide(CuO)
Q 4)The differences are:
(i)In Mendeleev periodic table, there were certain anomalous pairs which are not there in the modern periodic table.
(ii)In Mendeleev periodic table, the elements were placed according to increasing mass number whereas in the modern periodic table, the elements are placed in the form of increasing atomic number.
(iii)In Mendeleev periodic table, there were3 no inert gases, but in the modern periodic table, inert gases are present.
Q 5)(i)ZnCO3 --->ZnO + CO2
(ii) H2 + Cl2 ---> 2HCl
(iii)Mg + 2HCl ---> MgCl2 + H2
Q 6)(i) Neon
(ii)Calcium
(iii)Aluminium
Q 7)(i)E.C.= 2.8.2
Valency=2
(ii)Group=2
Period=3
(iii)Metal
(iv)MCl2
(v)Basic oxide
*Please do mark me as the brainliest*