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 191 Discuss
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If an atom has atomic number = 6 and number of neutrons = 10, then what is the atomic mass of the atom?

A
4
B
16
C
10
D
6

Answer & Explanation

Correct Option: B

The atomic mass of an isotope is effectively the sum of its protons and neutrons; therefore, 6 protons (from the atomic number) plus 10 neutrons equals a mass number of 16.
Question 192 Discuss
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The process by which molecules from a region of higher concentration move to a region of lower concentration is known as:

A
Osmosis
B
Active transport
C
Diffusion
D
Sublimation

Answer & Explanation

Correct Option: C

Diffusion describes the natural, passive movement of particles down their concentration gradient until they are evenly distributed within a given space.
Question 193 Discuss
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Before starting a 5 day and 5 night excursion, Mr. Patel provided all his students with battery powered flash lights. What chemical process inside the batteries helps them produce electricity?

A
Conversion of chemical energy to electrical energy
B
Conversion of mechanical energy to electrical energy
C
Nuclear fission
D
Thermal expansion

Answer & Explanation

Correct Option: A

Batteries operate as galvanic cells, generating an electrical current by converting internally stored chemical energy into electrical energy through spontaneous redox reactions.
Question 194 Discuss
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Which chemical compound is responsible for the spicy taste in chilli peppers?

A
Capsaicin
B
Caffeine
C
Ethanol
D
Tannin

Answer & Explanation

Correct Option: A

Capsaicin is the active chemical irritant in chili peppers that specifically binds to the heat-sensing receptors in human tissue, producing a strong burning sensation.
Question 195 Discuss
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Which of the following is the chemical formula of baking soda?

A
Na2CO3 ⋅ 10H2O
B
NaOH
C
CaOCl2
D
NaHCO3

Answer & Explanation

Correct Option: D

The correct chemical formula for baking soda, formally known as sodium bicarbonate, is NaHCO3.
Question 196 Discuss
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What is the impact of ocean acidification on coral reefs and shell-forming organisms?

A
Ocean acidification has no impact on coral reefs.
B
Ocean acidification enhances coral growth.
C
Ocean acidification weakens coral skeletons and affects shell formation.
D
Ocean acidification increases coral biodiversity.

Answer & Explanation

Correct Option: C

Increased carbon dioxide lowers ocean pH, depleting the concentration of vital carbonate ions that corals and mollusks rely on to build their calcium carbonate shells and skeletons.
Question 197 Discuss
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After realising the deadly effects of depleting the ozone layer, under which programme was the decision taken to ban the usage of CFC?

A
Kyoto Protocol
B
Montreal Protocol
C
Paris Agreement
D
Agenda 21

Answer & Explanation

Correct Option: B

Drafted in 1987, the Montreal Protocol is a landmark international treaty exclusively designed to protect the ozone layer by phasing out the production of chlorofluorocarbons (CFCs).
Question 198 Discuss
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Brine water is saturated or strongly impregnated with which of the following ionic compounds?

A
Sodium bromide
B
Sodium chloride
C
Sodium iodide
D
Sodium hydroxide

Answer & Explanation

Correct Option: B

Brine is defined as a high-concentration liquid solution of common salt, which is chemically known as sodium chloride (NaCl), heavily dissolved in water.
Question 199 Discuss
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Which is the correct formula to calculate the formula unit mass of a compound?

A
Multiplication of all the atomic masses of all the atoms within the formula
B
Summation of all the atomic weights of all the atoms within the formula
C
Summation of all the atomic masses of all the atoms within the formula
D
Multiplication of all the atomic weights of all the atoms within the formula

Answer & Explanation

Correct Option: C

The formula unit mass is calculated by mathematically adding together (summing) the atomic masses of every individual atom present in the compound's empirical formula.
Question 200 Discuss
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Which chemical reaction occurs when you mix vinegar (acetic acid) and baking soda (sodium bicarbonate)?

A
Oxidation
B
Precipitation
C
Neutralisation
D
Combustion

Answer & Explanation

Correct Option: C

Mixing an acid (vinegar) and a base (baking soda) results in an acid-base neutralization reaction, ultimately yielding water, a dissolved salt, and bubbling carbon dioxide gas.
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