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

The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.

(a)

6N

(b)

4N

(c)

2N

(d)

none of these

The correct order of the thermal stability of hydrogen halide is_______.

(a)

HI > HBr > HCl > HF

(b)

HF > HCl > HBr > HI

(c)

HCl > HF > HBr > HI

(d)

HI > HCl > HF > HBr

Which one of the following compounds is not formed?

(a)

XeOF₄

(b)

XeO₃

(c)

XeF₂

(d)

NeF₂

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

Among the following the correct order of acidity is ________.

(a)

HClO₂ < HClO < HClO₃ < HClO₄

(b)

HClO₄ < HClO₂ < HClO < HClO₃

(c)

HClO₃ < HClO₄ < HClO₂ < HClO

(d)

HClO < HClO₂ < HClO₃ < HClO₄

Which is dibasic?

(a)

Orthophosphoric acid

(b)

Pyrophosphoric acid

(c)

Orthophosphorus acid

(d)

Hypophosphorous acid

The hybridisation and shape of SF₆ is respectively?

(a)

sp³d², square planar

(b)

sp³d², octahedral

(c)

sp³d see-saw

(d)

sp³d, trigonal bipyramidal

Allotrope of sulphur which shows paramagnetic behaviour _______.

(a)

S₈- Rhombic

(b)

S₈- Monoclinic

(c)

S₂- In vapour phase

(d)

Not possible

Least volatile hydrogen halide is ______.

(a)

HF

(b)

HCI

(c)

HBr

(d)

HI

Oxalic acid on heating with cone H₂SO₄ gives ______.

(a)

CO only

(b)

CO₂ only

(c)

CO₂ + H₂O

(d)

CO + CO₂ + H₂O

Which one of the following orders is not in accordance with the property stated against it?

(a)

F₂ > CI₂ > Br₂ > I₂: Bond dissociation energy

(b)

HI > HBr > HCI > HF: Acidic property in water

(c)

F₂ > Cl₂ > Br₂ > l₂: Oxidising power

(d)

F₂ > Cl₂ > Br₂ > l₂: Electronegativity

The incorrect statement regarding structure of ozone is______.

(a)

Bond angle is less than 120°

(b)

It is linear

(c)

The two oxygen-oxygen bond length in ozone are identical

(d)

Both (b) and (c).

Maximum covalent character is shown by________.

(a)

PCl₃

(b)

NCl₃

(c)

AsCl₃

(d)

SbCl₃

The high reactivity of fluorine is due to________.

(a)

high ionisation energy

(b)

low bond dissociation energy

(c)

low electron affinity

(d)

high electro negativity

Explain why fluorine always exhibit an oxidation state of -1?

What are interhalogen compounds? Give examples.

Give the uses of helium.

What is the hybridisation of iodine in IF₇? Give its structure.

Give two uses of nitrogen.

Give two uses of nitric acid.

What is phosphorescence?

Discuss the oxidising power of fluorine.

(i) Give correct order of boiling point of hydride of group 17.
(ii) Fluorine exhibits only -1 oxidation state whereas other halogens show +1, +3, +5 and +7 oxidation state also Explain.

Arrange the following as indicated below:
(i) F₂, Cl₂, Br₂, I₂ - increasing bond dissociation enthalpy.
(ii) HF, HCI, HBr, HI - increasing acidic strength.

How will you prepare chlorine in the laboratory?

Give a reason to support that sulphuric acid is a dehydrating agent.

Write the molecular formula and structural formula for the following molecules.
a) Nitric acid
b) Dinitrogen pentoxide
c) phosphoric acid (PTA)
d) phosphine

Give the uses of argon.

What is Haber's process?

Name a reaction for the estimation of Ozone.

Why do noble gases form compounds with fluorine and oxygen only?

Out of H₂O and H₂S which one has higher bond angle and why?

Why CIF₃ exists but FCl₃ does not exist - Give reason.

Complete the following reactions
(l) Cl₂+ H₂O\(\longrightarrow \)?
(ii) XeF₆ + 2H₂O \(\longrightarrow \) ?
(Iii) XeF₆ + 2H₂O\(\longrightarrow \)?

Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

What type of hybridisation occur in
a) BrF₅
b) BrF₃

Mention the uses of helium.

Why is dioxygen a gas but sulphur a solid?

An amorphous solid (A) burns in air to form a gas (B) which turns lime water milky. The gas is also produced as a byproduct during roasting of sulphide ore. This gas decolourises acidified aqueous KMnO₄ solution and reduces Fe³⁺ to Fe²⁺. Identify the solid 'A' and the gas 'B' and write the reactions involved.

An element A occupies group number 15 and period number 3, exhibits allotropy and it is tetra atomic. A reacts with caustic soda to give B which is having rotten fish odour. A reacts with chlorine to give C which has a pungent odour Identify A, B and C. Write the reactions.

An element A occupies group number 15 and period number 3, reacts with chlorine to give compound B. The compound B on hydrolysis gives a dibasic acid C. The compound C on heating undergoes auto oxidation and reduction to give a tribasic acid D. Identify the elements A compounds B, C and D. Write the reactions.