An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The Weighted average atomic mass of the element X is closet to _________.

(a)

201 u

(b)

202 u

(c)

199 u

(d)

200 u

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to ______.

(a)

2 moles of HCI (g)

(b)

0.5 moles of HCI (g)

(c)

1.5 moles of HCI (g)

(d)

1 moles of HCI (g)

Fe2 + \(\longrightarrow\) Fe³⁺ + e^- is a ________ reaction.

(a)

redox

(b)

reduction

(c)

oxidation

(d)

decomposition

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

(a)

zinc > silver > copper

(b)

zinc > copper > silver

(c)

silver > copper > zinc

(d)

copper > silver > zinc

Match the list-I with list-II and select the correct answer using the code given below the lists.

List-I		List-II
A	Cr2O72-	1	+5
B	MnO4-	2	+6
C	VO3-	3	+3
D	FeF63+	4	+7

(a)

A	B	C	D
3	1	4	2

(b)

A	B	C	D
4	3	2	1

(c)

A	B	C	D
2	4	1	3

(d)

A	B	C	D
3	2	1	4

If Avogadro number were changed from 6.022 x 10²³ to 6.022 x 10²⁰, this would change ______.

(a)

the ratio of chemical species to each other in a balanced equation

(b)

the ratio of elements to each other in a compound

(c)

the definition of mass in units of grams

(d)

the mass of one mole of carbon

What is the mass of precipitate formed when 50 ml of 8.5 % solution of AgNO₃ is mixed with 100 ml of 1.865 % potassium chloride solution ?

(a)

3.59 g

(b)

7g

(c)

14 g

(d)

28 g

Which of the following is/are true with respect to carbon -12 ?

(a)

relative atomic mass is 12 u

(b)

the oxidation number of carbon is +4 in all its compounds.

(c)

1 mole of carbon-12 contain 6.022 x 10²² carbon atoms.

(d)

All of these

The change in the oxidation number of S in H₂S and SO₂,in the following industrial reaction:
2H₂S_(g) + SO_2(g) \(\longrightarrow\) 3S_(s) + H2O_(g)

(a)

-2 to 0, +4 to 0

(b)

-2 to 0, +4 to -1

(c)

-2 to -1, +4 to 0

(d)

-2 to -1, +4 to -2

Match the list I with List II and select the correct answer using. the code given below the lists.

List I		List II
A	Diamond	1	Heterogeneous mixture
B	Aerated drinks	2	Element
C	Distilled water	3	Homogeneous mixture
D	Sand	4	Compound

(a)

A	B	C	D
2	3	4	1

(b)

A	B	C	D
4	3	1	2

(c)

A	B	C	D
3	1	4	2

(d)

A	B	C	D
2	1	4	3

Identify the incorrect statement about a compound.

(a)

A molecule cannot be separated into its constituent elements by physical methods of separation

(b)

A molecule of a compound has atoms of different elements

(c)

A compound retains the physical properties of its constituent element

(d)

The ratio of atoms of different elements in a compound is fixed

Which among the following statement(s) describe an element?
i) It is a pure substance which could be split into two or more simpler substance.
ii) It is a pure substance which cannot be split into simpler substance
iii) It's composition is not uniform
iv) All the above

(a)

only (iv)

(b)

only (ii)

(c)

(ii) and (iii)

(d)

(i) and (iii)

1 amu =  _____________.

(a)

1.6605\(\times\)10^-25 kg

(b)

1.6605\(\times\)10^-26 kg

(c)

1.6605\(\times\)10^-27 kg

(d)

1.6605\(\times\)10^-28 kg

Statement I: an Equivalent mass of Mg is  determined by Oxide Method
Statement II: Molecular mass is calculated using vapour density

(a)

Both the statements are individually true

(b)

Both the statements are individually true and statement II is the correct explanation of statement I.

(c)

Statement I is true but statement IIis false.

(d)

Statement Iis false but statement IIis true

One mole of Sulphuric acid contains _______oxygen atoms

(a)

4 x 10²³

(b)

4 x 6.023 x 10^-23

(c)

4 x 6.023 x 10²³

(d)

4 x 6.023 x 10³²

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

(a)

23 gram molecule

(b)

23%

(c)

32%

(d)

32 gram molecule

Give an example of molecule in which the ratio of the molecular formula is six times the empirical formula.

(a)

C₆H₁₂O₆

(b)

CH₂O

(c)

CH₄

(d)

NA₂CO₃

The formula weight of ethanol (C₆H₅OH) is ____________.

(a)

56.5 amu

(b)

16 amu

(c)

60 amu

(d)

46 amu

The mass of an atom of nitrogen is _______________.

(a)

\(\frac { 14 }{ 6.023\times { 10 }^{ 23 } } \)

(b)

\(\frac { 28 }{ 6.023\times { 10 }^{ 23 } } \)

(c)

\(\frac { 1 }{ 6.023\times { 10 }^{ 23 } } \)

(d)

14 amu

The oxidation number of carbon in CH3 - CH₂OH is _______________.

(a)

+2

(b)

-2

(c)

0

(d)

+4