Symbols of Elements and Their Valencies

Q.

Write the chemical symbols of any two elements named in honour of a scientist.

Q. The arrow pointing downwards along with a product represents a gaseous product, whereas the arrow pointing upwards represents the precipitate in a reaction.

1. True
2. False

Q.

What is the valency of Oxygen in general?

1. -1

2. +1

3. -2

4. +2

Q.

What is the Latin name for the ‘silver’ element and its modern symbol?

Q.

Which of the following statements are true regarding the oxygen atom?

1. Valence electrons of oxygen are 6 and each oxygen atom will share 2 valence electrons to make a double bond with other oxygen atom.

2. Valence electrons of oxygen are 4 and each oxygen atom will share only 2 valence electrons to make a single bond with another oxygen atom.

3. Valence electrons of oxygen are 4 and each oxygen atom will share only 1 valence electron to make a bond with another oxygen atom.

4. Valence electrons of oxygen are 6 and each oxygen atom will share 2 valence electrons to make a single bond.

Q.

If the valency of A is 4 and that of B is 2. What will be the chemical formulae of a compound formed by the combination of A and B?

1. $A{B}_4$

2. $A{B}_2$

3. $AB$

4. $A_{2}B$

Q.

If calcium salt of anion has formula ${\mathrm{Ca}}_3{\mathrm{X}}_2$, what is the valency of $\mathrm{X}$ ? Write the formula of (I) sodium salt of X and (ii) aluminium salt of X.

Q.

What should be the charge on $C{O}_3$ in $FeC{O}_3$ if the valency of iron is 2?

1. 5
2. 6
3. 4
4. None of the above

Q.

Why is symbol considered short form of an element?

Q.

Write ‘T’ for True or ‘F’ for False for the given statements.

Rose $\notin$ the set of all vegetables.

1. True
2. False

Q.

The symbol is a short form to represent an element

1. True
2. False

Q.

The valency of calcium in calcium hydroxide is ___ .

Q.

The valencies of aluminium and chlorine in the compound $AlC{l}_3$ respectively are ______ and _____.

1. 1, 3

2. 3, 3

3. 1, 1

4. 3, 1

Q. Fill in the blanks.

Q. What is difference between valency and covalency ??

Q. The charge on cation $M$ is $+2$ and anion $A$ is $-3$. The compound has the formula :

1. $M_2{A}_3$
2. $M{A}_2$
3. $M_3{A}_2$
4. $M_{2}A$

Q.

State true or false:
To form chemical bond between any two or more than two entities valency is the significant thing to be kept in mind.

1. The number of atoms in a molecule
2. The number of molecule

Q.

Write ‘T’ for True or ‘F’ for False for the given statements.

$Gold\in \left\{Silver,Platinum,Gold\right\}$

1. True
2. False

Q.

Which of the following are correct with respect to stability of an atom?

1. Fully filled outer orbit

2. Octet configuration

3. Fully filled outer orbit and octet configuration

4. None of these

Q. Match the chemical formulae with the corresponding compounds.

1. Hydrogen bromide
2. Lithium oxide
3. Aluminium oxide
4. Sodium chloride