Ionic Compounds

Q.

How to find the valency of an element

Q.

Valency of aluminium is:

1. 4

2. 5

3. 3

4. 2

Q. The valency of sodium is _____.

1. one
2. two
3. four
4. three

Q.

Describe how sodium and chlorine atoms are changed into ions when they react with each other to form sodium chloride, NaCl. What is the name given to this type of bonding? (At. No of sodium = 11; At. No, of chlorine = 17)

Q.

What type of compounds are usually formed between metals and non- metals?

1. Ionic compound

2. Metallic compound

3. None of these

4. Covalent compound

Q.

Hydrogen is having one electron. To complete its duplet, it should gain one electron. Then it should become Hydride(H- )ion. But how can it loose one electron to form Hydeogen (H+) ion ? Why does it do so as it is gaining no stability ?

Q.

The atomic numbers fo four elements A, B, C and D are 6, 8, 10 and 12 respectively. The elements which can react to form ionic bonds (or ionic compound) are:
(a) A and D

(b) B and C

(c) A and C

(d) B and D

Q.

Ionic compounds are solids. Give reasons.

Q.

An ionic bond is formed when a metal transfers electrons to a non-metal.

1. True

2. False

Q. Question 1 (iii)

What are the ions present in ${\text{Na}}_2\text{O}$ and $\text{MgO}$ compounds?

Q. Which of the following is not a property of ionic compounds?

1. High melting and boiling points
2. Generally non-volatile
3. Conduct electricity in both molten and solid state
4. Conduct electricity in their aqueous solution

Q. Which type of bond H2S have?

Q. What equal charges would to be placed on earth and moon to neutralise their gravitational attraction (use mass of earth 105 kg and mass of moon is 10

Q.

The valency of nitrogen in $N_2$ molecule is 3.

1. 1

2. 2

Q.

The compound which does not contain ionic bond is

1. NaOH

2. HCl

3. $K_{2}S$

4. LiH

Q. Copy and complete the following table:

	Sodium	Phosphorous
Formula of chloride
Physical state of chloride at room temperature (i.e., solid, liquid or gas)
Nature of bonding in chloride (i.e., ionic or covalent)

Q.

In the formation of a compound $X{Y}_{2-}$ atom X gives one electron to each Y atom. What is the nature of bond in $X{Y}_2$? Give two properties Of $X{Y}_2$.

Q.

Elements Q and S react together to form an ionic compound. Can Q and S both be metals? Justify your answer.

1. Both Q and S can be metals.

2. Both Q and S be non-metals

3. None of the given options is correct

4. From Q and S, one should be metal and other should be non-metal

Q.

Write the electron-dot structure for sodium and chlorine atoms.
How do these form a chemical bond? Name the type of bond so formed.
Why does a compound has high melting point? [3 MARKS]

Q.

Who named Positive and Negative charges?

Q.

Elements of Group 16 have 6 valence electrons. The valency of Group 16 elements is:

1. 4

2. 3

3. 5

4. 2

Q.

An element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound $X{Y}_2$. State the nature of the chemical bond in $X{Y}_2$ and show how the electron configuration of X and Y change in the formation of this compound.

Q. Ionic bonds are formed only between metals and .

1. metals
2. non-metals
3. noble gases

Q. What is the difference between ionic, covalent and metallic bonds?

Q. Which of the following compounds does not have an ionic bond?

1. 
   HCl
2. 
   NaCl
3. 
   KCl
4. 
   $MgC{l}_2$

Q. How chlorine reacts differently with metals and non-metals?

Q.

Elements try to become stable by attaining inert gas configuration. In the ionic compound sodium chloride (NaCl), sodium and chlorine attain stability by losing and gaining an electron, respectively. Identify a correct option assuming the above situation.

1. Sodium forms positive ion
2. Chlorine forms positive ion
3. Chlorine forms negative ion
4. Sodium forms negative ion

Q. In the formation of ionic bonds, the participating atoms are metallic and non-metallic in nature. They exchange their valence electrons only.

1. True
2. False

Q.

Na₂ZnO₂ is which type of bond? Why do two metal react?

Q.

Why is the valency of lead 2 , even though the valence electrons are 4?