General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

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jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 131 Discuss
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Which of the following formulas represents the strongly basic chemical compound Barium Hydroxide?

A
Ba(OH)3
B
Ba(OH)2
C
Ba2OH
D
BaOH

Answer & Explanation

Correct Option: B

Barium is an alkaline earth metal situated in Group 2, natively possessing a +2 oxidation state. To properly balance the -1 charge of the hydroxide anion (OH-), two full hydroxide ions are required, yielding the correct formula Ba(OH)2.
Question 132 Discuss
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Which of the following statement is correct regarding rate of diffusion of liquids? I. Rate of diffusion of liquids is higher than that of solids. II. This is due to the fact that in the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state.

A
Neither I nor II
B
Both I and II
C
Only I
D
Only II

Answer & Explanation

Correct Option: B

Liquids naturally exhibit a much higher rate of diffusion than solids because their constituent particles are not locked into a rigid, structured lattice. The intermolecular forces in liquids are weaker, allowing molecules greater translational freedom to slide past one another and mix.
Question 133 Discuss
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Liquids flow and change shape, they are NOT rigid and thus they are also called as ..........

A
liquefied
B
Mixtures
C
fluid
D
Solution

Answer & Explanation

Correct Option: C

In physics and chemistry, any substance that continuously deforms (flows) under an applied shear stress is scientifically classified as a fluid. This broad physical definition inherently encompasses both liquids, which conform to the shape of their container, and gases.
Question 134 Discuss
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How many horizontal rows are present in the modern periodic table?

A
7
B
11
C
5
D
9

Answer & Explanation

Correct Option: A

The modern periodic table, structured around the quantum atomic model, is meticulously organized into exactly 7 horizontal rows known as 'periods'. Each period corresponds to the sequential filling of a principal quantum electron shell within the atoms.
Question 135 Discuss
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How many vertical columns are present in the modern periodic table?

A
16
B
14
C
20
D
18

Answer & Explanation

Correct Option: D

The standard, IUPAC-approved modern periodic table is organized into exactly 18 vertical columns, formally referred to as 'groups' or 'families'. Elements clustered within the same group share identical valence electron configurations, granting them extremely similar chemical properties.
Question 136 Discuss
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What is the other name for solid carbon dioxide?

A
White ice
B
Ice at room temperature
C
Dry ice
D
Freezed ice

Answer & Explanation

Correct Option: C

Solid carbon dioxide is universally referred to in commerce and science as 'dry ice' because it completely bypasses the liquid phase under normal atmospheric pressure. Instead, it undergoes rapid sublimation, transitioning directly from a frosty solid into a dense gas.
Question 137 Discuss
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Mendeleev's Periodic Law was modified, and was adopted as the basis of the Modern Periodic Table.

A
Atomic mass
B
Molar mass
C
Atomic number
D
Similar properties

Answer & Explanation

Correct Option: C

Dmitri Mendeleev originally organized elements by their atomic mass, which occasionally resulted in glaring inconsistencies. Following Henry Moseley's 1913 experiments with X-ray spectroscopy, the law was historically modified to base the table strictly on the atomic number (number of protons).
Question 138 Discuss
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Elements in the Modern Periodic Table are arranged in vertical columns called groups and horizontal rows called periods.

A
18,7
B
16,7
C
18,9
D
16,9

Answer & Explanation

Correct Option: A

The IUPAC-approved modern periodic table features exactly 18 vertical groups that categorize elements displaying similar chemical behaviors. It also prominently features 7 horizontal periods, which directly correspond to the principal energy levels occupied by the elements' electrons.
Question 139 Discuss
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How many elements are present in the first period of the periodic table?

A
Five
B
Three
C
Four
D
Two

Answer & Explanation

Correct Option: D

The very first period of the periodic table only fills the small 1s electron orbital, which has a rigid quantum maximum capacity of two electrons. Therefore, it logically contains only two elements: hydrogen (H) and helium (He).
Question 140 Discuss
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In the periodic table, which group consists of elements known as the noble gases?

A
Group 17
B
Group 1
C
Group 18
D
Group 7

Answer & Explanation

Correct Option: C

Group 18 definitively contains the noble gases, such as helium, neon, and argon, which historically were considered to be completely inert. Their extreme lack of chemical reactivity is due to their completely filled valence electron shells, providing maximum thermodynamic stability.
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