Hydrogen Test

Result

Hydrogen Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a function of water in our body?

A
Cell life

B
Body temperature regulation

C
Elimination of waste

D
All of above

Solution

The following are the functions of water in our body
(A) Cell life
(B) Body temperature regulation
(C) Elimination of waste
Water is a carrier, distributing essential nutrients (such as minerals, vitamins and glucose) to cells. Water has a large heat capacity which helps limit changes in body temperature in a warm or a cold environment. Water is an effective lubricant around joints. It also acts as a shock absorber for eyes, brain, spinal cord and even for the foetus through amniotic fluid. It eliminates waste in the form of urine.
Question 2
1 / -0

When water gets converted into ice, its volume:

A
increases

B
decreases

C
no change

D
cannot say

Solution

When water gets converted into ice, its volume increases.
Question 3
1 / -0

The density of water in $$kgm^{-3}$$ is :

A
$$1000$$

B
$$100$$

C
$$10,000$$

D
$$4000$$

Solution

The density of water is 1,000 $$kgm^{−3 }$$
Density $$= \dfrac{Mass}{Volume} = \dfrac{1000 kg}{1m^3}$$
Question 4
1 / -0

Hydrogen is similar to alkali metals in terms of:

A
electronic configuration

B
reducing agent

C
valency

D
all of the above

Solution

Hydrogen has same electronic configuration as it has only one electrons in its outermost shell. The valency of hydrogen is one and it is a good reducing agent. All these properties are similar to alkali metals.
Question 5
1 / -0

Hydrogen shows similar properties with halogens. Which of the following properties does not match with the halogens?

A
Electronic configuration

B
Valency

C
Atomicity

D
None of the above

Solution

The atomicity of hydrogen is two. It has one electron in its outermost shell and hence, the valency of hydrogen is also one. Electronic configuration does not match as the s orbital is half filled in hydrogen, which leads to s-s bonding, while p-p bonding exists in halogens, due to vacancy in p orbital.
Question 6
1 / -0

The density of water is maximum at:

A
$$40^oC$$

B
$$4^oC$$

C
$$14^oC$$

D
$$24^oC$$

Solution

The density of water is maximum at $$4^oC$$.
Question 7
1 / -0

____________ element has one electron in its outermost shell and attains duplet configuration after one more electron and attains stability.

A
Hydrogen

B
Fluorine

C
Helium

D
Berrylium

Solution

Hydrogen has one electron in its outermost shell and attains duplet configuration after one more electron and attains stability.
Question 8
1 / -0

Which of the following types of water is not in its free state?

A
River water

B
Well water

C
Distilled water

D
Rain water

Solution

Distilled water is purified water free of all dissolved salts. River, well and rain water is water in free state as collected in nature.
Question 9
1 / -0

Potassium on reacting with cold water catches fire and burns in a flame. Guess the colour of the flame.

A
Golden yellow

B
Lilac

C
Brick red

D
Blue

Solution

Potassium on reacting with cold water catches fire and gives a lilac colour flame.
Question 10
1 / -0

Water turns blue cobalt chloride paper:

A
no change

B
red

C
pink

D
orange

Solution

Cobalt chloride, $$CoCl_2$$, is a fascinating compound that changes color in response to humidity. As humidity increases, cobalt chloride changes color from sky blue to purple to pink. Such striking changes in color make cobalt chloride useful as a humidity indicator in weather instruments.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 33

Result

Hydrogen Test - 33

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Rank

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SHARING IS CARING

Question 1

Cell life

Body temperature regulation

Elimination of waste

All of above

Solution

Question 2

increases

decreases

no change

cannot say

Solution

Question 3

$$1000$$

$$100$$

$$10,000$$

$$4000$$

Solution

Question 4

electronic configuration

reducing agent

valency

all of the above

Solution

Question 5

Electronic configuration

Valency

Atomicity

None of the above

Solution

Question 6

$$40^oC$$

$$4^oC$$

$$14^oC$$

$$24^oC$$

Solution

Question 7

Hydrogen

Fluorine

Helium

Berrylium

Solution

Question 8

River water

Well water

Distilled water

Rain water

Solution

Question 9

Golden yellow

Lilac

Brick red

Blue

Solution

Question 10

no change

red

pink

orange

Solution

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My Perfomance

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