Polyatomic Molecules

Q.

What is the Valency and valence electrons of the first $20$ elements?

Q.

The atomicity of the element argon is ______.

1. one

2. two

3. three

4. four

Q.

Write the formula of calcium hydroxide?

1. 

2. 

3. 

4. CaOH

Q.

$10\mathrm{mL}$of $0.1N$$\mathrm{HCl}$ is added to $990mL$ solution of $NaCl$. The $\mathrm{pH}$ of the resulting solution is

1. zero

2. $3$

3. $7$

4. $10$

Q. Which of the following are polyatomic ions?

1. ${N{H}_4}^{+}$
2. ${S{O}_4}^{2-}$
3. ${Mn{O}_4}^{-}$
4. $C{l}^{-}$

Q.

By giving examples, define the term triatomic molecules.

Q. The molecular formulae of all the possible compounds formed from given ions are:
$(N{a}^{+},M{g}^{2+},C{l}^{-},S{O}_4^{2-})$

1. $NaCl,NaS{O}_4,MgC{l}_2,MgS{O}_4$
2. $NaCl,MgS{O}_4$
3. $NaCl,N{a}_{2}S{O}_4,MgC{l}_2,MgS{O}_4$
4. $N{a}_{2}S{O}_4,MgCl$

Q.

The ionic compound formed by the ions ${\text{Fe}}^{3+}$ and $({\text{SO}}_4{)}^{2-}$ has the chemical formula ________.

1. ${Fe}_2(S{O}_4{)}_3$

2. ${Fe}_{3}S{O}_4$

3. ${Fe}_{2}S{O}_4$

4. ${Fe}_3(S{O}_4{)}_2$

Q.

The formula of the metal oxide of metal A is ${\text{A}}_{\text{2}}{\text{O}}_{\text{3}}$. Determine the formula of its phosphate.

1. ${\text{A}}_{\text{3}}{\text{PO}}_{\text{4}}$

2. ${\text{APO}}_{\text{4}}$

3. ${\text{A}}_{\text{2}}{\text{(PO}}_{\text{4}}{\text{)}}_{\text{2}}$

4. ${\text{A(PO)}}_{\text{2}}$

Q.

Give the formula of

(a) Phosphate ion

(b) Aluminium ion

(c) Hydroxide ion

Q. Carbonate ion is a __________ ion.

1. monovalent
2. divalent
3. trivalent
4. pentavalent

Q. What is the chemical formula of ammonium chloride?

1. ${\text{NH}}_3\text{Cl}$
2. ${\text{NH}}_4\text{Cl}$
3. $\text{NH}\text{Cl}$
4. ${\text{NHCl}}_4$

Q.

What do you understand by acid radical?

Q. What is the chemical formula of ammonium chloride?

1. ${\text{NH}}_3\text{Cl}$
2. ${\text{NH}}_4\text{Cl}$
3. $\text{NH}\text{Cl}$
4. ${\text{NHCl}}_4$

Q. Which of the following are polyatomic ions?

1. Ammonium
2. Hydride
3. Oxide
4. Hydroxide

Q. Select the polyatomic ions.

1. ${{\mathrm{NO}}_3}^{-}$
2. ${\mathrm{Cl}}^{-}$
3. $H_3{O}^{+}$
4. ${\mathrm{Na}}^{+}$
5. ${\mathrm{OH}}^{-}$
6. ${{\mathrm{SO}}_4}^{2-}$
7. ${{\mathrm{NH}}_4}^{+}$
8. ${\mathrm{Cu}}^{2+}$

Q. Charged chemical species composed of two or more bonded atoms are called _________.

1. monoatomic ions
2. compounds
3. anions
4. polyatomic ions

Q. Which amongst the following gases forms a triatomic molecule?

1. Carbon dioxide
2. Carbon monoxide
3. Helium
4. Chlorine

Q.

Which amongst the following does not represent a polyatomic ion?

1. Carbonate

2. Chloride

3. Sulphate

4. Phosphate

Q.

Identify the monoatomic molecule from the following:

1. Ozone

2. Helium

3. Hydrogen

4. Nitrogen

Q. An ion that consists of more than one atoms is known as a polyatomic ion.

1. True
2. False