Valency to Chemical Formula

Q. The valency of barium in barium chloride is _____.

1. 4

2. 3

3. 2

4. 1

Q.

What is the symbol and valency of silver?

Q. What is the valency of aluminium?

1. 2
2. 8
3. 3
4. 4

Q. Why elements show variable valency?

Q.

Why does carbonate have a valency of two?

Q.

Question 11
Which of the following represents a correct chemical formula? Name it

$\left(a\right)$ $CaCl$
$\left(b\right)$ $BiP{O}_4$
$\left(c\right)$ $NaS{O}_4$
$\left(d\right)$ $NaS$

Q.

Among ${\mathrm{KO}}_2$, ${{\mathrm{AlO}}_2}^{-}$, ${\mathrm{BaO}}_2$ and ${{\mathrm{NO}}_2}^{+}$ unpaired electron are present in:

1. ${\mathrm{KO}}_2$

2. ${\mathrm{BaO}}_2$

3. ${\mathrm{BaO}}_2$ and ${{\mathrm{NO}}_2}^{+}$

4. ${\mathrm{KO}}_2$ and ${{\mathrm{AlO}}_2}^{-}$

Q.

What is the valency of Phosphate ions in ${\mathrm{AlPO}}_4$?

Q.

What causes the polarity in nitric acid?

1. Partial negative nature of oxygen & partial positive nature of hydrogen

2. Partial negative nature of nitrogen & partial positive nature of hydrogen

3. Partial negative nature of hydrogen & partial positive nature of nitrogen

4. Partial negative nature of hydrogen & partial positive nature of oxygen

Q.

What is the formula of Carbon tetrachloride?

Q. The chemical formula of the ionic compound containing copper(II) & sulphate ions is .

1. ${\mathrm{Cu}}_2{\mathrm{SO}}_4$
2. ${\mathrm{CuSO}}_4$
3. ${\mathrm{Cu}}_2{\left(\mathrm{SO}\right)}_2$

Q. the unit cell cube length for LiCl (just like nacl structure ) is 5.14 Angstrong . assuming anion anion contact , the ionic radius for chloride ion is-

Q. What is the charge of magnesium in $\text{Mg}{\text{Cl}}_2$?

1. 2

Q.

The atomic number for sodium is 11 and the atomic number for oxygen is 8. Based on this information find out the chemical formula for Sodium oxide?

1. $Na{O}_2$

2. $N{a}_2{O}_2$

3. $N{a}_{2}O$

4. $NaO$

Q.

What is the chemical formula of calcium phosphate?

1. $CaP{O}_4$

2. $C{a}_3(P{O}_4{)}_2$

3. $C{a}_4(P{O}_4{)}_3$

4. $C{a}_2(P{O}_4{)}_3$

Q.

Is Helium the smallest element?

Q.

The name of the cation is always written before the anion in a chemical formula.

1. True

2. False

Q.

In a chemical formulae, the valency of anion is 4.The valency of cation is 4.

1. Less than 4

2. More than 4

Q.

Choose the heteroatomic molecule of the given options:

1. O₂

2. He

3. HCl

4. P₄

Q. Question 1 (iii)
Write down the formulae of:
(iii) Sodium sulphide

Q.

Valency of tin in $SnC{l}_2$ and $SnC{l}_4$ is _______ and _______ respectively.

1. 3, 4

2. 2, 4

3. 4, 2

4. 2, 3

Q.

What Is The Valency of $\mathrm{Cu}$ In ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$?

Q. Question 57
An organic compound A on heating with concentrated ${\text{H}}_2{\text{SO}}_4$ forms a compound B which on an addition of one mole of hydrogen in presence of $\text{Ni}$ forms a compound C. One mole of compound C on combustion forms two moles of ${\text{CO}}_2$ and 3 moles of ${\text{H}}_2\text{O}$. Identify the compounds A, B and C and write the chemical equations of the reactions involved.

Q.

Find the chemical formula of aluminum chloride. [2 MARKS]

Q.

Strong acids and strong bases, both are harmful and will cause a chemical burn on our skin.

1. True

2. False

Q. Magnesium chloride is an ionic compound formed by magnesium and chloride ions. The overall charge on its molecule will be _____.

1. -1
2. +1
3. + 2
4. 0

Q.

Write the formula and common name of Potassium hydroxide.

Q.

Though $HCl$ and $N{H}_3$ are covalent molecules, their aqueous solutions conduct electricity, and this is due to

1. The presence of free electrons

2. The formation of free ions

3. The formation of hydrated compounds

4. Formation of a dative bond

Q.

If Z = 6, what would be the valency of the element?

1. 8

2. 6

3. 2

4. 4

Q.

Demineralised water is obtained by-

1. Treating with calgon

2. All of these

3. Ion exchange resins

4. Boiling