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 61 Discuss
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Which substance is commonly added to tap water to make it safe for drinking by killing harmful microorganisms?

A
Fluoride
B
Calcium
C
Iron
D
Chlorine

Answer & Explanation

Correct Option: D

Chlorination is a standard water treatment method used globally to disinfect water and prevent waterborne diseases.
Question 62 Discuss
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What is the primary acid found in citrus fruits like oranges and lemons?

A
Citric acid
B
Tartaric acid
C
Acetic acid
D
Lactic acid

Answer & Explanation

Correct Option: A

Citric acid is a weak organic acid that provides citrus fruits with their characteristic sour taste and acts as a natural preservative.
Question 63 Discuss
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Which of the following is the common name for the reaction of an acid with a base?

A
Precipitation
B
Neutralisation
C
Maillard reaction
D
Caramelisation

Answer & Explanation

Correct Option: B

Neutralization is a chemical reaction where an acid and a base react to form salt and water, resulting in a pH closer to neutral.
Question 64 Discuss
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Quicklime (CaO) is often added to soils that are ____ to increase fertility.

A
neutral soils
B
strongly acidic soils
C
alkaline soils
D
slightly acidic soils

Answer & Explanation

Correct Option: B

Adding calcium oxide (quicklime) neutralizes excess acidity in the soil, which helps improve nutrient availability for plants.
Question 65 Discuss
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Which of the following statements about nutrients are correct? Statement A: C, H, O, N, P and K are macro nutrients. Statement B: Fe, Mn, Ni, Co and Mo are micronutrients. Statement C: Micronutrients are not essential for our body.

A
All statements A, B and C
B
Only statements A and C
C
Only statements B and C
D
Only statements A and B

Answer & Explanation

Correct Option: D

Macro and micronutrients are both essential for life, though micronutrients are needed in much smaller quantities.
Question 66 Discuss
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The property of rock or soil that indicates the ability of allowing fluids to flow through it is called:

A
Plasticity
B
Density
C
Permeability
D
Stability

Answer & Explanation

Correct Option: C

Permeability measures the ease with which water or other fluids can move through the interconnected pores of a substance.
Question 67 Discuss
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Which of the following halogen elements are liquid and gas respectively at room temperature?

A
Iodine and Fluorine
B
Bromine and Chlorine
C
Astatine and Iodine
D
Bromine and Fluorine

Answer & Explanation

Correct Option: B

Bromine is the only non-metallic element that is a liquid at room temperature, while chlorine exists as a greenish-yellow gas.
Question 68 Discuss
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What is the chemical formula for potassium permanganate?

A
K2MnO4
B
KMnO2
C
K2MnO2
D
KMnO4

Answer & Explanation

Correct Option: D

Potassium permanganate (KMnO4) is a strong oxidizing agent used in chemical synthesis and as a disinfectant.
Question 69 Discuss
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What is denatured alcohol?

A
Ethanol mixed with little methanol
B
Pure Ethanol
C
Propanol
D
Pure Methanol

Answer & Explanation

Correct Option: A

Denatured alcohol is ethanol treated with additives like methanol to make it toxic and undrinkable for industrial use.
Question 70 Discuss
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The elements in Group 17 of the periodic table are known as:

A
noble gases
B
alkali metals
C
transition metals
D
halogens

Answer & Explanation

Correct Option: D

The word 'halogen' means 'salt-former', referring to the ability of these elements to react with metals to form various salts.
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