The p-Block Elements Test

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The p-Block Elements Test - 64

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Weekly Quiz Competition

Question 1
1 / -0

Statement 1: Oxidation state for fluorine is -1 in all compounds.
Statement 2: Fluorine is the most electronegative element.

A
Statement 1 is correct but statement 2 is not correct.

B
Statement 1 is not correct but statement 2 is correct.

C
Both the statements 1 and 2 are not correct.

D
Both the statements 1 and 2 are correct and statement 2 is not correct explanation of statement 1.

E
Both the statements 1 and 2 are correct and statement 2 is correct explanation of statement 1.
Question 2
1 / -0

In the laboratory chlorine gas can be prepared from:

A
manganese dioxide and sodium chlorine

B
red lead

C
hypo

D
bleaching powder

Solution

In the laboratory, chlorine gas can be prepared from manganese dioxide and sodium chlorine.
$$\displaystyle 2NaCl + MnO_2 + 3H_2SO_4 \rightarrow 2NaHSO_4 + MnSO_4 + Cl_2 + 2H_2O$$
Question 3
1 / -0

$$\beta $$ Sulphur is stable between:

A
114 $$^{ \circ }{ C }$$ to 160 $$^{ \circ }{ C }$$

B
95.6 $$^{ \circ }{ C }$$ to 119 $$^{ \circ }{ C }$$

C
160 $$^{ \circ }{ C }$$ to 230 $$^{ \circ }{ C }$$

D
112.8 $$^{ \circ }{ C }$$ to 140 $$^{ \circ }{ C }$$

Solution

$$\displaystyle \beta$$ sulphur is stable above $$\displaystyle 95.6^oC$$ below which it is converted into $$\displaystyle \alpha$$ form.
The meltiong point of $$\displaystyle \beta$$ sulphur is $$\displaystyle 119.2 ^oC$$ .
So option (B) $$\displaystyle 95.6^oC$$ to $$\displaystyle 119^oC$$ is the answer.
Question 4
1 / -0

Chlorine was discovered by:

A
Priestley

B
Davy

C
Shceele

D
Cavendish

Solution

Chlorine was discovered by Shceele in 1774. He prepared it by heating $$\displaystyle MnO_2$$ with $$\displaystyle HCl$$ and named it oxymuriatic gas.
Question 5
1 / -0

Which of the following does not contain chlorine?

A
Rock salt

B
Sylvine

C
Cryolite

D
Carnallite

Solution

$$Cl$$ occurs commonly both in the earth's crust and seawater.
the most common compound of chlorine in seawater is $$NaCl$$ and minimum amount of $$KCl$$ is also occur in seawater.
the most mineral of $$Cl$$ are (Rocksalt)$$NaCl$$,(Sylvine)$$KCl$$ and(carnallite) $$KClMgCl_2$$.$$\left( { Na }_{ 3 }Al{ F }_{ 6 } \right) $$ Cryolite does not contain chlorine.
Question 6
1 / -0

Which catalyst is used in Haber process for manufacturing of $$NH_3$$?

A
$$Pt$$

B
$$Fe+Mo$$

C
$$CuO$$

D
$$Al_2O_3$$

Solution

Ammonia($$NH_3$$) is prepared from $$N_2,H_2$$ in 1:3 ratio using $$Fe$$ catalyst and $$Mo$$ promoter.
Hence option B is correct.
Question 7
1 / -0

Nitrogen does not show pentacovalency because of:

A
absence of s-orbitals

B
absence of d-orbitals

C
its small size

D
none of these

Solution

The electronic configuration of nitrogen is $$1s^22s^22p^3$$. Nitrogen don't have d-orbitals and thus don't show pentacovalency.
Question 8
1 / -0

Ammonia gas can be collected by the displacement of:

A
Conc. $$H_2SO_4$$

B
Brine

C
Water

D
Mercury

Solution

Ammonia is less dense than air hence can be collected by upward displacement of air and mercury.
Question 9
1 / -0

Which of the following halide of nitrogen is stable in nature?

A
$$NF_ 3$$

B
$$NCl _3$$

C
$$NBr_ 3$$

D
$$NI _3$$

Solution

Nitrogen has very small size as compared to the halogens, which have much larger sizes. Due to this, they can not remain bonded to the nitrogen atom and hence are highly unstable. $$NF_3 $$ is stable because fluorine and nitrogen have comparable sizes and electronegativity.
Question 10
1 / -0

Which of the the following properties of oxygen differs from the rest of members of its family?

A
High value of ionization energy

B
Oxidation state (2,4,6)

C
Polymorphism

D
Formation of hydride

Solution

Oygen shows a veriety of oxidation states like $$-2,-1,-\cfrac{1}{2}$$ and $$2,4,6$$. Where as the other elements in the group do not show this many oxidation states. This makes the oxygen different from other elements of the group.
Hence option B is correct.

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The p-Block Elements Test - 64

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The p-Block Elements Test - 64

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Question 1

Statement 1 is correct but statement 2 is not correct.

Statement 1 is not correct but statement 2 is correct.

Both the statements 1 and 2 are not correct.

Both the statements 1 and 2 are correct and statement 2 is not correct explanation of statement 1.

Both the statements 1 and 2 are correct and statement 2 is correct explanation of statement 1.

Question 2

manganese dioxide and sodium chlorine

red lead

hypo

bleaching powder

Solution

Question 3

114 $$^{ \circ }{ C }$$ to 160 $$^{ \circ }{ C }$$

95.6 $$^{ \circ }{ C }$$ to 119 $$^{ \circ }{ C }$$

160 $$^{ \circ }{ C }$$ to 230 $$^{ \circ }{ C }$$

112.8 $$^{ \circ }{ C }$$ to 140 $$^{ \circ }{ C }$$

Solution

Question 4

Priestley

Davy

Shceele

Cavendish

Solution

Question 5

Rock salt

Sylvine

Cryolite

Carnallite

Solution

Question 6

$$Pt$$

$$Fe+Mo$$

$$CuO$$

$$Al_2O_3$$

Solution

Question 7

absence of s-orbitals

absence of d-orbitals

its small size

none of these

Solution

Question 8

Conc. $$H_2SO_4$$

Brine

Water

Mercury

Solution

Question 9

$$NF_ 3$$

$$NCl _3$$

$$NBr_ 3$$

$$NI _3$$

Solution

Question 10

High value of ionization energy

Oxidation state (2,4,6)

Polymorphism

Formation of hydride

Solution

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