Question

B Answer the questions in one word.
1 What is the smallest partide of an element that can take pan in a chemical reacam2
2. Name an element which dists in the free state in natsite
3. If the formula of an element is X, its atomicity is
4. If two compounds that do not react chemically are múzed, what do we get?
5. Dues a symbol represent an atom or a molecule? What are the symbols for each of the following
2. cavale
b. copper
chlorine
d. caston
6. Write the formulae for
a sulphuric acid b. calcium hydroxide c. sugar
d. common salt
7. MgO + HC - MgC1, + H2O is a balanced equation. True or false?
Pls tell

Answer 1

Answer:

Let the valency of X in XH3 is x.

Valency of H = 1 (Given)

As, NH3 is a neutral molecule, so,

(Valency of X)+(3× Valency of H) = 0⇒(x) +(3×1)=0⇒x=−3

So, the valency of X is −3.

Let's assume the valency of Y in YX2 = y

Valency of X = −3

As, YX2 is a neutral molecule, so,

(Valency of Y)+(2×valency of X)=0⇒(y)+(2×(−3))=0⇒y=6

So, the valency of Y in YX2 is 6.

Hence, the valency of X is −3 and valency of Y is 6.