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 181 Discuss
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Which of the following minerals are also used as mild abrasives in toothpaste?

A
Mercury, graphite, diamond
B
Micas, chlorite, talc, and serpentine
C
Calcite, magnesite, dolomite
D
Pyrite, galena, sphalerite

Answer & Explanation

Correct Option: C

Carbonate minerals like calcite, magnesite, and dolomite are commonly added to toothpaste as mild abrasives to help scrub away plaque without heavily damaging tooth enamel.
Question 182 Discuss
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The valency of Ca is 2+. The valency of O is 2−. What is the simplified chemical formula of Calcium oxide?

A
Ca2O2
B
CaO
C
CaO2
D
Ca2O

Answer & Explanation

Correct Option: B

Because the calcium ion has a 2+ charge and the oxygen ion has a 2- charge, they perfectly balance each other in a 1:1 ratio, making the simplified empirical formula CaO.
Question 183 Discuss
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What is the name of the compound with the formula N2O5?

A
Nitrogen dioxide
B
Nitric oxide
C
Nitrous oxide
D
Dinitrogen pentoxide

Answer & Explanation

Correct Option: D

In chemical nomenclature for covalent compounds, the prefix 'di-' indicates two nitrogen atoms, and 'penta-' indicates five oxygen atoms, forming dinitrogen pentoxide.
Question 184 Discuss
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Why cannot we write the chemical formula of a compound formed by chlorine and sodium as ClNa instead of NaCl?

A
isotopes
B
ions
C
nucleons
D
electrons

Answer & Explanation

Correct Option: B

By standard chemical naming conventions for ionic compounds, the positively charged metal ion (cation, Na+) must always be written before the negatively charged non-metal ion (anion, Cl-).
Question 185 Discuss
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What is the chemical reaction that occurs when fats or oils combine with a strong alkali, such as sodium hydroxide, to make soap?

A
Saponification
B
Combustion
C
Fermentation
D
Oxidation

Answer & Explanation

Correct Option: A

Saponification is the specific hydrolysis reaction where triglycerides (fats or oils) react with a strong base to yield glycerol and fatty acid salts, which we commonly call soap.
Question 186 Discuss
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What is the most common factor for the yellowing of the Taj Mahal gradually over the years?

A
Carbon monoxide present in air
B
Marble turns yellow with time
C
Marble reacts with nitrogen in air
D
Acid rain

Answer & Explanation

Correct Option: D

Industrial pollutants like sulfur dioxide react with atmospheric moisture to form acid rain, which chemically attacks and discolors the calcium carbonate marble of the Taj Mahal.
Question 187 Discuss
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Since the attraction between molecules of gas is very low, what benefit do we get from this property of gas?

A
Changing the kinetic energy in the particles of the matter
B
Changing the temperature of the matter
C
It allows gases to be highly compressed into small volumes
D
Changing the colour of the matter

Answer & Explanation

Correct Option: C

Because intermolecular forces in gases are extremely weak and there is vast empty space between molecules, gases can be easily compressed for efficient transport and storage, such as in CNG cylinders.
Question 188 Discuss
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Name a sublimable substance that can be converted into gas without passing through any intermediate liquid phase.

A
Naphthalene
B
Chalk Powder
C
Alum
D
Rust

Answer & Explanation

Correct Option: A

Naphthalene, the main ingredient in traditional mothballs, undergoes sublimation by transitioning directly from a solid state to a gaseous vapor at standard atmospheric temperature.
Question 189 Discuss
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Which white powder, ubiquitous in modern kitchens, combines with acid to produce carbon dioxide?

A
Sodium fluoride
B
Sodium phosphate
C
Sodium bicarbonate
D
Sodium nitrate

Answer & Explanation

Correct Option: C

Sodium bicarbonate, universally known as baking soda, undergoes a chemical reaction when mixed with acidic ingredients (like vinegar or lemon juice) to release carbon dioxide gas, aiding in baking leavening.
Question 190 Discuss
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Calcium hydroxide is the chemical name of which of the following saturated aqueous solutions?

A
Hard water
B
Black Water
C
Limewater
D
Carbonated water

Answer & Explanation

Correct Option: C

Limewater is the common name given to a dilute, aqueous solution of calcium hydroxide, widely used in chemistry classrooms to test for the presence of carbon dioxide gas.
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