Assertion : Fluorine has an oxidation state of - 1 in all its compounds.
Reason : Fluorine is the most electronegative element of the periodic table.

(a)

Both assertion and reason are correct and the reason is the correct explanation for the assertion.

(b)

Both assertion and reason are correct but reason is not the correct explanation for the assertion

(c)

Assertion is true but reason are false.

(d)

Both assertion and reason are false.

In Rutherford's gold foil experiment, a thin gold foil was bombarded with a stream of fast moving ___________

(a)

B particles

(b)

\(\alpha\)-particles

(c)

\(\gamma\) particles

(d)

\(\delta\) particles

The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these atomic numbers.
(2) The ionisation enthalpy of the elements generally increase with increase in atomic number
(3) For transition elements the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals.
(4) Fifth period contain 18 elements.

(a)

1 and 2

(b)

2 and 3

(c)

4 only

(d)

3 only

___________ torches is/are used in cutting and welding of a steel.

(a)

Oxy acetylene

(b)

Oxy hydrogen

(c)

both a and b

(d)

neither a nor b

Half life of francium is _______

(a)

12.3 years

(b)

12.3 mins

(c)

21 years

(d)

21 mins

Value of gas constant R is ____________

(a)

0.082dm³atm

(b)

0.987 cal mol^-1 K^-1

(c)

8.3 J mol^-1 K^-1

(d)

8 er mol^-1 K^-1

Which among the following is an intensive property?

(a)

free energy

(b)

heat capacity

(c)

volume

(d)

molar volume

Le-Chatelier's principle is not applicable to _____________

(a)

\({ F }e_{ \left( g \right) }+{ S }_{ \left( s \right) }\rightleftharpoons { FeS }_{ \left( s \right) }\) 

(b)

\({ H }_{ 2\left( g \right) }+{ I }_{ 2\left( g \right) }\rightleftharpoons { 2HI }_{ \left( g \right) }\)

(c)

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

(d)

\({ N }_{ 2\left( g \right) }+3H_{ 2\left( g \right) }\rightleftharpoons { 2NN }_{ 3\left( g \right) }\)

For associative solutes ____________

(a)

i < 1 and a < 1

(b)

i > 1 and a >. 1

(c)

i < 1 and a < 1

(d)

i > 1 and a < 1

The sharing of valence electrons between the atoms will lead to the formation of_____

(a)

Ionic bond

(b)

Covalent bond

(c)

Co-ordinate bond

(d)

Hydrogen bond