The p-Block Elements Test

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The p-Block Elements Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has seven valence electrons?

A
$$Na^{+}$$

B
$$Al$$

C
$$F$$

D
$$Ti$$

E
$$B$$

Solution

We know that halogens have 7 electrons in their valence shell.
$$F, Cl, Br, I$$ are halogens.
Hence, option $$C$$ is correct.
Question 2
1 / -0

Which of the following pairs is obtained on heating ammonium dichromate?

A
$$\displaystyle { N }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$

B
$$\displaystyle { N }_{ 2 }O$$ and $$\displaystyle { H }_{ 2 }O$$

C
$$\displaystyle { NO }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$

D
$$\displaystyle NO$$ and $$\displaystyle { NO }_{ 2 }$$

Solution

Ammonium dichromate on heating gives nitrogen, chromic oxide and water.
$$\displaystyle { \left( { NH }_{ 4 } \right) }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }\underrightarrow { \Delta } { N }_{ 2 }+{ Cr }_{ 2 }{ O }_{ 3 }+4{ H }_{ 2 }O$$
Question 3
1 / -0

In the preparation of ammonia gas from ammonium chloride and calcium hydroxide, the reactants are ground thoroughly________

A
to provide maximum surface area

B
to provide maximum surface area

C
to increase the number of particle

D
None of these

Solution

In the preparation of ammonia gas from ammonium chloride and calcium hydroxide, the reactants are ground thoroughly to provide a maximum surface area of the reactants which helps in speeding up the reaction.

Option A is correct.
Question 4
1 / -0

Ammonia can be collected by displacement of

A
Water

B
$$Conc.{ H }_{ 2 }S{ O }_{ 4 }$$

C
Brine

D
Mercury

Solution

Ammonia is an extremely soluble gas and cannot be collected by displacement of water or acid. It can only be collected over a liquid in which it does not dissolve.
One such liquid is mercury because it does not react with ammonia and it can be easily collected by displacement of the metal as it is liquid at room temperature.
Question 5
1 / -0

What is the bond order of N-N bond in $$N_2O$$?

A
1

B
1.5

C
2

D
2.5

Solution

Bond order will be $$ \frac{Total no. of bonds} {Total No. of canonical structures} = \frac{5}{2}=2.5$$
The third structure is not possible as nitrogen cannot have two negative charges so we will consider only two structures.
In 1st structure there are three bonds between both nitrogen and in second structure there are two bonds so total bonds is 5.
Question 6
1 / -0

What is found in silver deposits?

A
Phosphorous

B
Bismuth

C
Copper

D
Antimony

Solution

Silver is found in a native form very rarely as nuggets, but more usually combined with sulfur, arsenic, antimony, or chlorine and in various ores such as argentite Ag₂S, chlorargyrite ("horn silver," AgCl), and galena (a lead ore often containing significant amounts of silver).
Question 7
1 / -0

Noble gases do not react because they have __________ electrons in their valence shell.

A
3

B
6

C
1

D
8

Solution

Noble gases do not react because they have a complete octet of eight electrons in their valence shell.
Question 8
1 / -0

All noble gases are:

A
colourlful

B
colourless and odourless

C
colourless and but have odour

D
none of these

Solution

All the noble gases are colourless and odourless gases, in addition to being chemically inert and stable.
Question 9
1 / -0

$$N,P,As,Sb,Bi$$ elements belong to:

A
VA Group

B
IV A Group

C
VII A Group

D
VIII A Group

Solution

The VA group of the periodic group consists of nonmetals such as nitrogen, phosphorous, antimony, bismuth, arsenic.
The electronic configuration of elements given in question are:
N- $$1s^22s^22p^3$$
P-$$1s^22s^22p^63s^22p^3$$
As- $$3d^{10}4s^24p^3$$
Sb- $$4d^{10}5s^25p^3$$
Bi- $$4f^{14}5d^{10}6s^26p^3$$
In all the configurations, the valence shell of the element has 5 electrons and as the group number is decided by number of valence shell electrons. That's why elements have group number VA.
Question 10
1 / -0

Urea is prepared by the chemical reaction of:

A
acetamide and ethyl alcochol

B
ammonium sulphate and calcium chloride

C
ammonia and Carbon dioxide

D
chlorine and water

Solution

The chemical formula of urea is $$H_2N-CO-NH_2$$
Urea is now prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 24

Result

The p-Block Elements Test - 24

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SHARING IS CARING

Question 1

$$Na^{+}$$

$$Al$$

$$F$$

$$Ti$$

$$B$$

Solution

Question 2

$$\displaystyle { N }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$

$$\displaystyle { N }_{ 2 }O$$ and $$\displaystyle { H }_{ 2 }O$$

$$\displaystyle { NO }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$

$$\displaystyle NO$$ and $$\displaystyle { NO }_{ 2 }$$

Solution

Question 3

to provide maximum surface area

to provide maximum surface area

to increase the number of particle

None of these

Solution

Question 4

Water

$$Conc.{ H }_{ 2 }S{ O }_{ 4 }$$

Brine

Mercury

Solution

Question 5

1

1.5

2

2.5

Solution

Question 6

Phosphorous

Bismuth

Copper

Antimony

Solution

Question 7

3

6

1

8

Solution

Question 8

colourlful

colourless and odourless

colourless and but have odour

none of these

Solution

Question 9

VA Group

IV A Group

VII A Group

VIII A Group

Solution

Question 10

acetamide and ethyl alcochol

ammonium sulphate and calcium chloride

ammonia and Carbon dioxide

chlorine and water

Solution

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