Ionic Compounds: Chemical Formula

Q.

The valency of an element A is 3 and that of element B is 2. Write the formula of the compound formed by the combination of A and B.

Q.

Which of the following has the highest value of pH?

1. $\mathrm{HCl}$

2. $\mathrm{NaOH}$

3. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4. ${\mathrm{CH}}_3\mathrm{COOH}$

Q.

Work out the formula for sulphur dioxide. (Valencies: S = 4; O = 2)

Q.

An atom X has three electrons more than the noble gas configuration. What type of ion will it form ? Write the formula of its (i) sulphate (ii) nitrate (iii) phosphate (iv) carbonate (v) hydroxide.

Q.

The total number of electrons in one molecule of carbon dioxide is:

Q.

What is blue and green vitriol.Write it's chemical name and somw uses

Q. The chemical formula of calcium hydroxide is _________.

1. $Ca(OH{)}_2$
2. $CaO{H}_2$
3. $Ca{O}_2$
4. $C{a}_2(OH{)}_3$

Q.

What is the significance of the symbol of an element? explain with the help of an example?

Q.

Write the chemical formula of the compound aluminium hydroxide in a step-by-step manner.

Q.

What is the formula for the Calcium ion?

Q.

Which of the following has the highest $pH$?

1. Distilled water

2. $1MN{H}_3$

3. $1MNaOH$

4. Water saturated with chlorine

Q.

What is the symbol and valency of tin?

Q. Why is hydrogen peroxide written as H₂O₂ and not HO?

Q.

Question 17
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them.

(a) Ammonia

(b) Carbon monoxide

(c) Hydrogen chloride

(d) Aluminium fluoride

(e) Magnesium sulphide

Q.

Write the chemical formula of the compound copper [I] sulphide in a step-by-step manner.

Q.

Which chemical formula correctly represents the compound having two hydrogen atoms, one carbon atom, and three oxygen atoms?

1. HCO₃

2. H₂CO₃

3. H₃CO₂

4. H₃C₂O₃

Q.

Write the chemical formula of the following:

Copper sulfate

Q. Question 4 (a)
Write the chemical formulae of the following:
(a) Magnesium chloride

Q.

Which one of the following has highest pH?

1. Distilled water

2. 1 M ${\mathrm{NH}}_3$

3. 1 M $\mathrm{NaOH}$

4. Water saturated with chlorine

Q.

What are the rules for writing a formula of a compound?

Q.

The formula for hydrogen chloride is ______________ ( HCI / KCI ).

Q.

Write the formula of the compound ferrous sulphide.

Q.

An element Z has a valency of 3. What is the formula of oxide of Z?

Q.

What is the full form of ${\mathrm{O}}_2$?

Q. Balancing of a chemical equation is based on which of the following laws?

1. Law of Conservation of Mass
2. Boyle's Law
3. Law of Constant Proportions
4. Avagadro's Law

Q.

Write down the names of compounds represented by the following formulae: [ 5 MARKS ]

1. Al₂ (SO₄)₃

2. CaCl₂

3. K₂SO₄

4. KNO₃

5. CaCO₃

Q.

Write the formula by criss-cross method of Magnesium chloride.

Q.

Read the given statements below and choose the correct option.

Statement 1: Isomers have same chemical and physical properties.

Statement 2: Isomers have different chemical formula.

1. Statement 1 is correct; Statement 2 is wrong.

2. Statement 1 is wrong; Statement 2 is correct.

3. Both statement are correct.

4. Both statements are incorrect.

Q.

The formula of Calcium oxide is ${\mathrm{Ca}}_2{\mathrm{O}}_2$.

1. True
2. False

Q.

Sugar is a compound which contains carbon, hydrogen, nitrogen and oxygen.

1. False

2. True