Which is true regarding nitrogen?

(a)

least electronegative element

(b)

has low ionisation enthalpy than oxygen

(c)

d- orbitals available

(d)

ability to form pπ-pπ bonds with itself

Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.

(a)

P₄(red) & PH₃

(b)

P₄(white) & PH₃

(c)

S₈ & H₂S

(d)

P₄(white) & H₂S

On hydrolysis, PCl₃ gives________.

(a)

H₃PO₃

(b)

PH₃

(c)

H₃PO₄

(d)

POCl₃

The basicity of pyrophosphorous acid ( H₄P₂O₅) is _______.

(a)

4

(b)

2

(c)

3

(d)

5

Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

(a)

Both assertion and reason are true and reason is the correct explanation of assertion.

(b)

Both assertion and reason are true but reason is not the correct explanation of assertion

(c)

Assertion is true but reason is false

(d)

Both assertion and reason are false

Most easily liquefiable gas is _______.

(a)

Ar

(b)

Ne

(c)

He

(d)

Kr

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

(a)

Br₂ > I₂ > F₂ > Cl₂

(b)

F₂ > Cl₂ > Br₂ > l₂

(c)

I₂ > Br₂ > Cl₂ > F₂

(d)

Cl₂ > Br₂ > F₂ > I₂

When copper is heated with conc HNO₃ it produces ________.

(a)

Cu(NO₃)₂, NO and NO₂

(b)

Cu(NO₃)₂ and N₂O

(c)

Cu(NO₃)₂ and NO₂

(d)

Cu(NO₃)₂ and NO

Catenation property of group 15 elements, follow the order _______.

(a)

N < P < As < Sb < Bi

(b)

P >> N > As > Sb > Bi

(c)

P < N < As < Sb < Bi

(d)

N>> P > As > Sb > Bi

Which is dibasic?

(a)

Orthophosphoric acid

(b)

Pyrophosphoric acid

(c)

Orthophosphorus acid

(d)

Hypophosphorus acid

Allotrope of sulphur which shows paramagnetic behaviour _______.

(a)

S₈- Rhombic

(b)

S₈- Monoclinic

(c)

S₂- In vapour phase

(d)

Not possible

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

When Copper is heated with cone HNO₃ it produces

(a)

Cu (NO₃)₂ and N₂O

(b)

Cu (NO₃)₂ and NO₂

(c)

Cu (NO₃)₂ and NO

(d)

Cu (NO₃)₂ NO and N₂O

Oxalic acid on heating with cone H₂SO₄ gives ______.

(a)

CO only

(b)

CO₂ only

(c)

CO₂ + H₂O

(d)

CO + CO₂ + H₂O

Which among the following ion is not formed?

(a)

F₃^-

(b)

C1₃^-

(c)

Br₃^-

(d)

I₃^-

The incorrect statement among the following is _________.

(a)

Reducing character of hydrides of group 15 increases down the group

(b)

Basicity of hydrides of group 15 increases down the group

(c)

NCl₅ does not exist

(d)

Phosphorus and arsenic can form P\(\pi \)-d\(\pi \) bond but not nitrogen

Maximum covalent character is shown by________.

(a)

PCl₃

(b)

NCl₃

(c)

AsCl₃

(d)

SbCl₃

Repeated use of which one of the following fertilizers would increase the activity of the soil_______.

(a)

Ammonium sulphate

(b)

Superphosphate of lime

(c)

Urea

(d)

Potassium nitrate

Oxidation states of P in H₄P₂O₅, H₄P₂O₆, H₄P₂O₇ are respectively _______.

(a)

+3, +4, +5

(b)

+3, +5, +4

(c)

+5, +3, +4

(d)

+5, +4, +3

Helium is used in balloons in the place of hydrogen because it is________.

(a)

incombustible

(b)

radioactive and detected easily

(c)

lighter than hydrogen

(d)

both (a) and (c)