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12th Chemistry Monthly Test - 3 ( p-Block Elements-II)

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 3 ( p-Block Elements-II)-Aug 2020

Time : 2.30 Hours

Part - A

Generic 2 - Answer All Question

Although \(\triangle\)H of fluorine is less negative than that of chlorine, but fluorine is a stronger oxidising agent than chlorine, why?

Arrange the following as indicated below:
(i) F_2' Cl₂, Br₂, I₂ - increasing bond dissociation enthalpy.
(ii) HF, HCI, HBr, HI - increasing acidic strength.

What is the reaction of Phosphorous with alkali?

How is nitrogen prepared from liquid air?

What are interhalogen compounds? Give examples.

How would you account for the following? The electron gain enthalpy with negative sign is less for oxygen than that of sulphur.

Account for the following:
(i) O-O bond lengths in ozone molecule are identical.
(ii) Most of the reactions in fluorine are exothermic.

Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

Give the reason for bleaching action of Cl₂.

There is a huge difference between the melting and boiling points of oxygen and sulphur. Why?

What is inert pair effect?

Explain Why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not - Give reason.

Acidic character increases from HF to HI. I State whether the above statement is True or false and give reason for your answer.

(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.
What is phosphoresencer?

How is ammonia prepared in the lab?
Explain why fluorine always exhibit an oxidation state of -1?

Part - B

Generic 3 - Answer All Question

Complete the following reactions
(l) Cl₂+ H₂0\(\longrightarrow \)?
(ii) XeF₆ + 2H₂0 \(\longrightarrow \) ?
(Iii) XeF₆ + 2H₂0\(\longrightarrow \)?

Explain the commercial method of preparation of nitric acid. (or) How nitric acid is prepared by Ostwald's process

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

Explain why the stability of oxaacids of chlorine increases in the order given below?
HCIO < HCIO_z < HCIO₃ < HCIO₄

Discuss the anomalous nature of fluorine.

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

Write the molecular formula and structural formula for the following molecules.
a) Nitric acid
b) dinitrogen pentoxide
c) phosphoric acid
d) phosphine
Write the reason for the anamolous behaviour of Nitrogen.

Why CIF ₃ exists but FCl₃ does not exist - Give reason.

Give the balanced equation for the reaction between chlorine with cold NaOh and hot NaOH.

Name a reaction for the estimation of Ozone.

Part - C

Generic 5 - Answer All Question

What happens when PCl₅ is heated?

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

How is chlorine manufactured by the electrolysis of brine.

Explain the bleaching action of Chlorine.
Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

How is sulphuric acid manufacture by contact process?

Give a reaction between nitric acid and a basic oxide.

Complete the following reactions
(i) KCIO₃\(\longrightarrow \)?
(ii) ZnS + O₂\(\longrightarrow \) ?
(iii) Al₂O₃ + NaOH + H₂O\(\longrightarrow \) ?
(iv) NaOH + SO₂\(\longrightarrow \) ?
(v) KCI+ H₂SO₄ \(\longrightarrow \) ?

(i) \({ PCXl }_{ 5 }+Ag\longrightarrow \)
(ii) \({ PCXL }_{ 5 }+Ag\longrightarrow \)
(iii) \({ PCXl }_{ 5 }+Ag\longrightarrow \)
(iv) \({ PCXL }_{ 5 }+Ag\longrightarrow \)
(v) \({ NaH }_{ 2 }{ PO }_{ 2 }+HCl\longrightarrow \)

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