Question

plz try to answer all the questions but if u know only one than also post the answer
plz try to solve as soon as possible we need it urgently ​

Answer 1

Answer:

7.a as agco is silver salt so if it is in direct exposure of sunlight it will melt. So Agcl is kept in dark coloured bottles.

b. as their might be impurities in it which will result in an explosion.

c.it must be balanced so that while doing the practical process we can determine the no of atoms of each elements required to perform the reaction.

d.valency and valence electrons are different bcoz if the no of valence electrons are less than or equal to 3 then it gives away the electrons and in that case the valency and and the number of valence electrons are same,but if it is not then the no of electrons gained is the valency.

e.A catalyst is a substance that increases the rate of a chemical reaction without itself being changed at the end of the chemical reaction. ... On the other hand, promoter is a material that enhances the action of a catalyst without any change in itself

Answer 2

Answer:

7 a)When silver nitrate is exposed to light it will decompose into its elements. When direct light falls on it, its color will change to brown or black. Dark color (Brown color) bottles prevent the passage of light and therefore it prevents the decomposition process. ... This is why silver nitrate is stored in brown bottles.

b)tap water is not used to prepare a solution of silver nitrate in the laboratory. The tap water contains chloride dissolved in water is chloride ions which precipitate AgNO3 solution to precipitate of AgCl.

c)A chemical equation must be balanced because the Law of Conservation of matter must be hold good during a chemical equation. Balancing of equation is necessary because atoms are neither created nor destroyed during a chemical equation

d)Valence electron is simply the total number of electrons present in outermost shell of an atom. Valency is the number of electrons an atom looses,gains or shares with other atoms in order to get a stable configuration.

e)A catalyst is a substance that increases the rate of a chemical reaction without itself being changed at the end of the chemical reaction. ... On the other hand, promoter is a material that enhances the action of a catalyst without actually having any catalytic value itself

8 a)2ZnS+3O2=2zno+2so2

b)S+4HNO3=SO2+4NO2+2H20

c)cl2+SO2+2H2O=H2SO4+2HCl

9a) basic radical= calcium

acidic radical=bromine

b)basic =Na+

acidic=zno2-

c) acidic= N3-

basic 3H+

d basic = Mg2+

acidic=PO3 3-

Explanation: