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12th Chemistry weekly Test - 2 ( p-Block Elements-II )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 2 ( p-Block Elements-II )-Aug 2020

Time : `1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

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

incombustible
radioactive and detected easily
lighter than hydrogen
both (a) and(c)

Which of the following halides of group 15 is not hydrolysed?

NF₃
PF₃
NI₃
Both (a) and (b)

An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

1s² 2s² 2p⁴
1s² 2s² 2p³
1s² 2s² 2p⁶ 3s² 3p²
1s² 2s² 2p⁶ 3s² 3p³

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

Ammonium sulphate
Superphosphate of lime
Urea
Potassium nitrate

Least volatile hydrogen halide is

HF
HCI
HBr
HI

The high reactivity of fluorine is due to_________

high ionisation energy
low bond dissociation energy
low electron affinity
high electro negativity

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

6N
4N
2N
none of these

Which reaction is not feasible__________

\({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)
\({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)
\(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)
\(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)

hot concentrated H₂SO₄ is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?

\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)

In which of the following , NH₃ is not used?

Nessler’s reagent
Reagent for the analysis of IV group basic radical
Reagent for the analysis of III group basic radical
Tollen’s reagent

Orthophosphorus acid on heating gives________

Hypophosphorus
Orthophosphoric acid
Phosphine gas
both (b) and (c)

Catenation property of group 15 elements, follow the order

N < P < As < Sb < Bi
P >> N > As > Sb > Bi
P < N < As < Sb < Bi
N>> P > As > Sb > Bi

When copper is heated with conc HNO₃ it produces

Cu(NO₃)₂ , NO and NO₂
Cu(NO₃)₂ and N₂O
Cu(NO₃)₂ and NO₂
Cu(NO₃)₂ and NO

Pick the wrong one among the following

F₂ - Yellow
Br₂ - Red
Cl₂ - Colourless
I₂- Violet

Maximum covalent character is shown by__________

PCl₃
NCl₃
AsCl₃
SbCl₃

Oxidation states of P in H₄P₂O₅' H₄P₂O₆, H₄P₂O₇ are respectively _________

+3, +4, +5
+3, +5, +4
+5,+3,+4
+5,+4,+3

XeF₆ on complete hydrolysis produces

XeOF₄
XeO₂F₂
XeO₃
XeO₂

Oxalic acid on heating with cone H₂SO₄ gives

CO only
CO₂ only
CO₂+ H₂0
CO + CO₂ + H₂O

In the brown ring test, brown colour of the ring is due to

a mixture of No and NO₂
Nitroso ferrous sulphate
Ferrous nitrate
Ferric nitra

Strong reducing behaviour of H₃PO₂ is due to______

High oxidation state of phosphorus
High electro gain enthalpy of phosphorus
Presence of two-OH groups and one P-H bond
Presence of one-OH groups and two P-H bonds

Part - B

Generic 5 - Answer All Question

Complete the following reactions.
1. NaCl + MnO₂ + H₂SO₄ ⟶
2. NaNO₂ + HCl ⟶
3. IO₃-+ I^- + H⁺ ⟶
4. I₂ + S₂O₃^2- ⟶
5. P₄ + NaOH + H₂O ⟶
6. AgNO₃ + PH₃ ⟶
7. Mg + HNO₃ ⟶
8. KCIO₃ \(\overset { a }{ \longrightarrow } \)
9. \(\quad Cu+\overset { Hotconc }{ { H }_{ 2 }SO_{ 4 } } \) ⟶
10. Sb + Cl₂ ⟶
11. HBr + H₂SO₄ ⟶
12. XeF₆ + H₂O ⟶
13. XeO₆^4- + Mn²⁺ + H⁺ ⟶
14. XeOF₄ + SiO₂ ⟶
15. \(Xe+{ F }_{ 2 }\overset { Ni/200atm }{ \underset { 400^{ 0 }C }{ \longrightarrow } } \).

Account for the following:
(i) Reducing character decreases from SO₂ to TeO₂.
(ii) Xenon forms compounds with fluorine and oxygen only.

Mention the uses of helium

Howdoes sulphuric acid react with metals at various conditions

An element 'A' occupies group number 15 and period number 3. It reacts with chlorine: to giveBwhich further reacts with chlorine to giveCat 273K. Both Band Care chlorinating agents for organic compounds. C is a better chlorinating agent because it chlorinates metals also.Breacts with SO3and reduces it to SO₂' B has a pyramidal shape. C has trigonal bipyramidal shape by sp³d hybridisation. Identify the element A and the compounds B ' and C. Write the reactions.

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

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