Hydrogen Test

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Hydrogen Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

The element having no neutron in the nucleus of its atom is:

A
hydrogen

B
nitrogen

C
helium

D
boron

Solution

Hydrogen has atomic number 1. It has monatomic form is the most abundant chemical substance and it has single proton and zero neutrons. It exists in diatomic form.
Question 2
1 / -0

Ionic hydrides are formed by:

A
transition metals

B
elements of very high electropositivity

C
elements of very low electropositivity

D
metalloids

Solution

Ionic hydrides are formed by metals that are electropositive with respect to hydrogen i.e., alkali and alkaline earth $$($$except $$Be$$ and $$Mg)$$. They involve an electron transfer from metal to $$H$$ forming hydride ion $$H^-$$.
Question 3
1 / -0

Heavy water is:

A
water with mercury compounds

B
water with chlorides and sulphates of Ca and Mg

C
water with bicarbonates of Ca and Mg

D
deuterium oxide

Solution

Heavy water is deuterium oxide $$(D_2O)$$. Ordinary water contains a fraction (1 in 6000 parts) of heavy water. On large scale, it is produced by repeated electrolysis of ordinary water containing alkali.It is also produced by repeated distillation and condensation.
Question 4
1 / -0

Hydrogen behaves as a metal:

A
at low temperature

B
at low pressure

C
at high temperature

D
at high pressure

Solution

Metallic hydrogen is a phase of hydrogen when it behaves as electrical conductor. At the high pressure of gigapascals hydrogen might exist as a liquid metal. Liquid metallic hydrogen is thought to be present in large amount in gravitationally compressed interiors of Jupiter and Saturn.
Question 5
1 / -0

The oxidation number of hydrogen varies from:

A
-1 to +1

B
0 to +1

C
-1 to 0

D
0 to +2

Solution

The electronic configuration of the hydrogen atom is $$1s^{1}$$. So, it can act as an electron acceptor to complete its' outer orbital as well as it can act as an electron donor to donate its' outermost electron to gain stability like metals.

In hydrides like$$NaH$$, $$H$$ occurs in $$-1$$ state.
In acids as well as oxides, $$H$$ occurs in $$+1$$ state.

Therefore its' oxidation state varies from $$-1$$ to $$+1$$.
Question 6
1 / -0

Hydrogen loses its electron to form $$H^+$$, in this respect, it resembles:

A
halogens

B
alkali metals

C
transition element

D
alkaline earth metals

Solution

Alkali metals are electro positive in nature it readily lose its valence shell electron, and hydrogen resembles like alkali metals.
Question 7
1 / -0

The characteristics of hydrogen resemble the elements of_____as well as_____groups.

A
IIA and VA

B
IIIA and VIA

C
IIA and VIA

D
IA and VIIA

Solution

Because hydrogen has $${ 1e }^{ - }$$ in its outermost shell which is ready to be donated like that a group $$1A$$ (alkali metals). Also hydrogen can accept an $${ e }^{ - }$$ to from $${ H }^{ - }$$ having $${ 2e }^{ - }$$ in outer shell which is stable this resembles to $$VIIA$$ group (Halogen family), as they also require only one $${ e }^{ - }$$ to fulfill their incomplete octet.
Question 8
1 / -0

Pure water is:

A
colourless and opaque

B
colourless and transparent

C
coloured and transparent

D
colourless, odourless and transparent

Solution

Pure water, also known as purified water, is water from a source that has removed all impurities. Distilled water is the most common form of pure water. The water can be purified by carbon filtration, microporous filtration and ultraviolet oxidation. Some places use a combination of purification processes. Pure water is colorless, odorless and transparent.
Question 9
1 / -0

______ give lather even with hard water due to the formation of________

A
Soaps, soluble salts

B
Detergents, soluble salts

C
Detergents, insoluble salts

D
Soaps, insoluble precipitates

Solution

Detergents give lather even with hard water their $$Ca$$ and $$Mg$$ salts are ionic in nature and therefore soluble in water. These salts of soap are covalent and form an insoluble precipitate in hard water.

Hence, the correct option is $$\text{C}$$
Question 10
1 / -0

Pure water is a ________ conductor of electricity.

A
good

B
bad

C
either could be possible

D
none of the above

Solution

Pure water is bad conductor of electricity due to lack of impurities (salts and minerals).

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Hydrogen Test - 29

Result

Hydrogen Test - 29

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SHARING IS CARING

Question 1

hydrogen

nitrogen

helium

boron

Solution

Question 2

transition metals

elements of very high electropositivity

elements of very low electropositivity

metalloids

Solution

Question 3

water with mercury compounds

water with chlorides and sulphates of Ca and Mg

water with bicarbonates of Ca and Mg

deuterium oxide

Solution

Question 4

at low temperature

at low pressure

at high temperature

at high pressure

Solution

Question 5

-1 to +1

0 to +1

-1 to 0

0 to +2

Solution

Question 6

halogens

alkali metals

transition element

alkaline earth metals

Solution

Question 7

IIA and VA

IIIA and VIA

IIA and VIA

IA and VIIA

Solution

Question 8

colourless and opaque

colourless and transparent

coloured and transparent

colourless, odourless and transparent

Solution

Question 9

Soaps, soluble salts

Detergents, soluble salts

Detergents, insoluble salts

Soaps, insoluble precipitates

Solution

Question 10

good

bad

either could be possible

none of the above

Solution

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