Chemistry Test 38

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Chemistry Test 38

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Weekly Quiz Competition

Question 1
4 / -1

The two functional groups present in a typical carbohydrate are:

A
—OH and —COOH

B
—CHO and —COOH

C
>C = O and —OH

D
—OH and —CHO

Solution

Carbohydrates are primarily hydroxyl carbonyl compound hence > C = O and –OH are present.
Hence, option C is correct.
Question 2
4 / -1

Graphite is a soft solid lumbricant extramely difficult to melt. The reason for ths anomalous behaviour is that graphite

A
is a non-rystalline substance

B
in san allotropic form of diamond

C
has molecules of variable moleuclar masses like polymers

D
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

Solution

C-atoms form covalently bonded plates (layers). Layers are bonded weakly together, that’s why one layer can slide over other cause lubricacy. Cannot be melted easily as larege number of atoms being bonded strongly in the layer form big entity.

Hence, option D is correct.
Question 3
4 / -1

The increasing order of the ionic radii of the given isoelectronic species is :

A
Cl^–, Ca²⁺, K⁺, S^2–

B
S^2–, C^l–, Ca²⁺, K⁺

C
Ca²⁺, K⁺, Cl^–, S^2–

D
K⁺, S^2–, Ca²⁺, Cl^–

Solution

For isoelectronic species, as the z/e decreases, ionic radius increases. Higher the positive charge smaller will be the ionic radius. Higher the negative charge, larger will be the ionic radius. Hence, the correct increasing order is Ca²⁺< K⁺ < Cl^–< S^2–.
Hence, option C is correct.
Question 4
4 / -1

Identify the correct statement among the following:

A
Cl₂ reacts with excess of NH₃ to give N₂ and HCl

B
Br₂ reacts with hot and strong NaOH solution to give NaBr, NaBrO₃ and H₂O

C
Ozone reacts with SO₂ without a catalyst to give SO₃

D
Silicon reacts with NaOH(_aq) in the presence of air to give Na₂SiO₃ and H₂O

Solution

Br₂ reacts with hot and strong NaOH to give NaBr, NaBrO₃ and H₂O.
Hence, option B is correct.
Question 5
4 / -1

Which of the following on thermal decomposition yields a basic as well as an acidic oxide ?

A
NaNO₃

B
KClO₃

C
CaCO₃

D
NH₄NO₃

Solution

The thermal decomposition reaction of the compounds given are :
2KClO₃ ---- > 2KCl + 3O₂

2NaNO₃ ------ >2NaNO₂ + O₂

NH₄NO₃ → N₂O + 2H₂O

2NH₄NO₃ → 2N₂ + O₂ + 4H₂O

CaCO₃ ---- > CaO + CO₂
Basic Acidic
Only CaCO₃on thermal decomposition gives acidic and basic oxide. Hence option C is correct.

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Chemistry Test 38

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Question 1

—OH and —COOH

—CHO and —COOH

>C = O and —OH

—OH and —CHO

Solution

Question 2

is a non-rystalline substance

in san allotropic form of diamond

has molecules of variable moleuclar masses like polymers

has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

Solution

Question 3

Cl–, Ca2+, K+, S2–

S2–, Cl–, Ca2+, K+

Ca2+, K+, Cl–, S2–

K+, S2–, Ca2+, Cl–

Solution

Question 4

Cl2 reacts with excess of NH3 to give N2 and HCl

Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO3 and H2O

Ozone reacts with SO2 without a catalyst to give SO3

Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O

Solution

Question 5

NaNO3

KClO3

CaCO3

NH4NO3

Solution

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Cl^–, Ca²⁺, K⁺, S^2–

S^2–, C^l–, Ca²⁺, K⁺

Ca²⁺, K⁺, Cl^–, S^2–

K⁺, S^2–, Ca²⁺, Cl^–

Cl₂ reacts with excess of NH₃ to give N₂ and HCl

Br₂ reacts with hot and strong NaOH solution to give NaBr, NaBrO₃ and H₂O

Ozone reacts with SO₂ without a catalyst to give SO₃

Silicon reacts with NaOH(_aq) in the presence of air to give Na₂SiO₃ and H₂O

NaNO₃

KClO₃

CaCO₃

NH₄NO₃