Which one of the following is not equal to gram molecular mass of hyderogen

1

(a)

2 grams

(b)

6.022 x 10²³ atoms of hydrogen

(c)

6.022 x 10²³ molecules of hydrogen

(d)

1 mole of hydrogen

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

In SO₂, the mass of sulphur in combination with 3.0 oxygen is 

1

(a)

3.0 g

(b)

4.0 g

(c)

32.0 g

(d)

16.0 g

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.

Naturally occurring oxygen is a mixture of atoms of slightly different masses called ............

1

(a)

isotopes

Formula mass and not molecular mass is used for substance whose constituent particles are ..............

1

(a)

ions

Avogadro's number represents ................... particles of a substance.

1

(a)

6.022 x 10²³

The combining power of an element is known as ..............

1

(a)

valency

The abbreviations used for the lengthy names of elements are termed ............

1

(a)

symbols

What are polyatomic ions?Give examples

1

(a)

What is an atom?

2

(a)

Define and explain atomic mass of an element.

2

(a)

The chemical formula of chloride of metal 'M' is MCl.Write the chemical formula of its chloride, bicarbonate and sulphide.

2

(a)

A 0.24g sample of a compound of oxygen and bound by analysis to contain 0.096 g of born and 0.144 g of oxygen:
(i) calculate the percentage compositions of the compound by weight
(ii) Find the number of moles in 0.144 g of oxygen gas

2

(a)

16.26 mg of a sample of an element 'X' contains 1.66 x 10²⁰ atoms.What is the atomic mass of the element X? 

2

(a)

Give an account of existence of various elements and compounds.

5

(a)

The mass of a single atom M is 3.05 x 10^-23 g.What is its atomic weight?What would this element be? Check table for possible answers.

5

(a)

Which has more number of atoms, 100 grams of sodium or 100 grams of iron (Given, atomic mass of Na = 23 u, Fe = 56 u)?

5

(a)

What is molecular formula? Explain with example what information can be derived from a molecular formula?

5

(a)

Verify by calculating that
(i) 5 moles of CO₂ and 5 moles of H₂O do not have the same mass.Atomic mass of carbon, oxygen and hydrogen are 12 u, 16 u, 14 u respectively.
(ii) 240 g of calcium and 240 g magnesium elements have a mole number ratio of 3 : 5.Atomic mass of calcium and magnesium are 40 u and 24 u respectively.

5

(a)