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 161 Discuss
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Which metalloid in the carbon group is chemically similar to its group neighbours tin and silicon?

A
lead
B
nickel
C
manganese
D
Germanium

Answer & Explanation

Correct Option: D

Germanium is a Group 14 metalloid that chemically resembles both silicon (directly above it) and tin (directly below it). Historically, Dmitri Mendeleev perfectly predicted its exact properties in 1869, calling it 'eka-silicon' fifteen years before its actual laboratory discovery.
Question 162 Discuss
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What is the name of the process of gases being outpoured from the interior of the solid earth?

A
Subduction
B
Erosion
C
Outgassing
D
Weathering

Answer & Explanation

Correct Option: C

Outgassing is the geological process where trapped volatiles and gases are forcefully released from the Earth's interior into the atmosphere, often via volcanic eruptions. Historically, this massive geological mechanism is responsible for creating the Earth's early atmosphere and oceans.
Question 163 Discuss
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Which artificial element has been provisionally named seaborgium by American researchers in honour of Nobel Laureate Glenn T Seaborg?

A
Element 103
B
Element 106
C
Element 90
D
Element 97

Answer & Explanation

Correct Option: B

Seaborgium (Sg) is a highly radioactive synthetic element assigned the atomic number 106. In a controversial historical move, it was named after American chemist Glenn T. Seaborg while he was still alive, breaking a long-standing tradition in chemical nomenclature.
Question 164 Discuss
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Which of the following statements best describes Le Chatelier's Principle?

A
It states that energy cannot be created or destroyed.
B
It relates the pressure and volume of a gas.
C
If a dynamic equilibrium is disturbed by changing conditions, the position of equilibrium moves to counteract the change.
D
It defines the rate of chemical kinetics.

Answer & Explanation

Correct Option: C

Formulated by Henri Le Chatelier in 1884, this foundational chemical principle asserts that when a system at equilibrium is subjected to an external stress, it will shift its equilibrium to counteract and minimize that stress. It remains crucial for maximizing yields in modern industrial chemical processes.
Question 165 Discuss
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Who was recognised for his services in the discovery of inert gaseous elements in air and in the determination of their place in the periodic system?

A
Lord Rayleigh
B
Henry Cavendish
C
Henry Miers
D
Sir William Ramsay

Answer & Explanation

Correct Option: D

Sir William Ramsay was a famous Scottish chemist who historically discovered the noble gases—including argon, neon, krypton, and xenon—and established them as a completely new group on the periodic table. For this monumental contribution, he was awarded the Nobel Prize in Chemistry in 1904.
Question 166 Discuss
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Which is the weakest intermolecular force, considered as the Van der Waals force, often found in halogens, noble gases and other non-polar molecules?

A
Hydrogen bonding
B
Dipole-dipole
C
Ion-dipole
D
London dispersion forces

Answer & Explanation

Correct Option: D

First explained mathematically by Fritz London in 1930, London dispersion forces are definitively the weakest type of intermolecular attraction. They arise from temporary, rapidly fluctuating dipole moments in electron clouds and are the only attractive forces present between non-polar molecules and noble gases.
Question 167 Discuss
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Technetium, the first artificially produced element used in many medical diagnostic imaging scans, is found in which group of the periodic table?

A
Group 7
B
Group 19
C
Group 12
D
Group 14

Answer & Explanation

Correct Option: A

Technetium (Tc) belongs to Group 7 of the transition metals and was the very first predominantly artificial element to be synthesized, achieved by Carlo Perrier and Emilio Segrè in 1937. Because all of its isotopes are radioactive, it is invaluable today in modern nuclear medicine.
Question 168 Discuss
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Identify the odd option from among the following.

A
Nitrogen
B
Oxygen
C
Fluorine
D
Sodium

Answer & Explanation

Correct Option: D

Nitrogen, oxygen, and fluorine are all highly electronegative, covalently bonding non-metal elements found tightly grouped on the upper right of the periodic table. Sodium firmly stands out as the odd option because it is a highly reactive, electropositive alkali metal from Group 1.
Question 169 Discuss
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The correct chemical formula of the compound Magnesium Hydroxide is:

A
MgOH
B
Mg(OH)3
C
Mg2OH
D
Mg(OH)2

Answer & Explanation

Correct Option: D

Magnesium is an alkaline earth metal that natively forms a +2 cation (Mg2+). To properly create a neutral ionic compound, it requires exactly two -1 hydroxide anions (OH-), resulting in the chemical formula Mg(OH)2, famously known as 'milk of magnesia.'
Question 170 Discuss
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What is the name of the solution that is employed to identify the existence of starch in food?

A
Ammonium chloride
B
Chlorine solution
C
Iodine solution
D
Copper sulphate solution

Answer & Explanation

Correct Option: C

Iodine solution (I2 dissolved in aqueous potassium iodide) historically serves as a classic, reliable chemical test for the presence of starch. When it encounters the amylose helix structure within starch, it slips inside to form a striking blue-black inclusion complex.
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