A mole does not signify

1

(a)

atomic mass unit

(b)

6.023 x 10²³ ions

(c)

22.4 litres of a gas at STP

(d)

gram molecular mass

Which one of the following dose not represnt molar mass of a substance?

1

(a)

1 mole of HCl

(b)

6.023 x 10²³ molecules of helium

(c)

16 g of O₂

(d)

44 g of CO₂

Molecules of the following element are made up of one atom of that element

1

(a)

Iron

(b)

Sodium

(c)

Helium

(d)

Chlorine

When 50 g of calcium carbonate is heated, 22g of CO₂ escapes out.What is the amount residue left?

1

(a)

Cannot be found

(b)

More data is required

(c)

56 g

(d)

28 g

Which of the following supports Dalton's atomic theory of matter?

1

(a)

Formation of isotopes

(b)

Formation of isobars

(c)

Law of definite proportions

(d)

Graphite and diamond though made from carbon, show different properties.

Choose the odd molecule

1

(a)

Argon molecule

(b)

Chlorine molecule

(c)

Oxygen molecule

(d)

Fluorine molecule

Choose the correct statement

1

(a)

Two atoms of hydrogen combine with one atom of oxygen to give water molecule.

(b)

One atom of hydrogen combine with one atom of chlorine to from hydrogen chloride 

(c)

One atom of nitrogen combine with 3 atoms of hydrogen to form 1 molecule of ammonia

(d)

One atom of carbon combines with one molecules of oxygen to form one molecule of carbon dioxide.

Which one of the following compound is not made up of charged ions?

1

(a)

HCl

(b)

NaCl

(c)

MgCl₂

(d)

CaO

Which one of the following elements gives polyatomic molecules?

1

(a)

Ne

(b)

P

(c)

Ni

(d)

Si

Arrange the following compounds in the order of increasing number of molecules:
2 g NH₃; 2 g H₂O; 2 g CO; 2 g HCl

1

(a)

CO<HCl<H₂O<NH₃

(b)

HCl<CO<H₂O<NH₃

(c)

NH₃<H₂O<CO<HCl

(d)

NH₃<H₂O<CO<HCl

A group of ....... atoms, molecules or ions is called one mole.

1

(a)

6.022 x 10²³

The unit of atomic mass is .............

1

(a)

u

One mole of S contains ............ atoms.

1

(a)

8 x 6.022 x 10²³

Dalton's atomic theory provides explanation for the various laws of ...................

1

(a)

combinations

A .......... is the smallest particle of an element or compound and is capable of independent existance

1

(a)

molecule

Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

1

(a)

Which postulate of Dalton's atomic theory can explain the law of definite proportions?

1

(a)