Valency

Q.

The valency of sulphate ion is_____

Q.

Valency of oxygen is generally two whereas sulfur shows valency of two four and six. Explain.

Q.

What is the valency of phosphide?

Q.

Question 21
Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
(a) helium
(b) neon
(c) argon
(d) krypton

Q.

List the elements having variable valency $1\mathrm{and}3$?

Q.

Why is carbon tetrachloride, which is a liquid a non-electrolyte?

Q.

Give three examples of elements having variable valency.

Q.

Write the Lewis symbol of Neon.

Q. Answer the following in respect of element ${}_{16}{\text{S}}^{32}.$
(iii) What is its valency?

Q.

Which of the following statements is true about element R present in ${13}^{th}$ group of the periodic table?

1. It is gas at room temperature.

2. It has oxidation state of + 4.

3. It forms $R_2{O}_3$.

4. It forms $R{X}_2$.

Q.

How many valence electrons does Chlorine have?

Q. Which of the following statements is incorrect regarding the valency of an element?
(a) Valency of alkali metals is 2
(b) Valency of group 18 elements is zero
(c) Valency of elements first increases till group 14 and then decreases across a period in the Modern periodic table.

1. Only (a)
2. Only (c)
3. Only (b)
4. Both (a) and (c)

Q.

Elements In The Same Group Have Equal Valency Comment On It

Q.

Write the valency of the following radical.

Zincate

Q.

Explain the term ‘variable valency’. Copper having electronic configuration 2, 8, 18, 1 exhibits variable valency. Give reason for the same and name the compound CuCl and CuCl₂.

Q.

The valency of cupric ion is_____

Q. Give examples- (a) a covalent compound containing hydrogen.
(b) An ionic compound containing hydrogen.

Q. Identify the atoms which has octet configuration in their outermost shell.

1. Helium
2. Neon
3. Xenon
4. Iron
5. Krypton
6. Argon
7. Chlorine
8. Radon
9. Hydrogen

Q.

Only metals exhibit variable valency.

1. True
2. False

Q. Identify the gas that is chemically inert.

1. Helium
2. Hydrogen
3. Oxygen
4. Fluorine

Q. According to octet rule, atoms tends to acheive _____ electrons in the outermost shell.

1. six
2. four
3. eight
4. one

Q. If an element has valency 2 then the group of Modern Periodic Table to which this element belongs is

1. 13
2. 1
3. 14
4. 2

Q. Match the given elements with their valencies and choose the correct option.

	Column-I		Column-II
a.	Oxygen	(i)	Zero
b.	Carbon	(ii)	One
c.	Fluorine	(iii)	Two
d.	Argon	(iv)	Four

1. a(iii), b(iv), c(i), d(ii)
2. a(iv), b(i), c(ii), d(iii)
3. a(iii), b(iv), c(ii), d(i)
4. a(iv), b(iii), c(ii), d(i)

Q. Which of the following inert gases have 2 electrons in the outermost shell?

1. Ne
2. He
3. Ar
4. Kr

Q.

Which of the following elements has only one valency?

1. Phosphorous

2. Iron

3. Oxygen

4. Nitrogen

Q.

In group $17$ how many valence electrons does Iodine have?

Q. All the elements in the same group of the modern periodic table have the same number of valence electrons.

1. True
2. False

Q. The number of valence electron 'V' and valency 'M' of an element having atomic number 14 is

1. V = 6
   M = 6
2. V = 4
   M = 4
3. V = 8
   M = 2
4. V = 4
   M = 2

Q.

What will be the valency of the element whose atom has three protons and four neutrons?

Q.

According to the octet rule an atom can have maximum ________ valence electrons in its outermost shell.

1. 6
2. 8
3. 2
4. 4