Chemistry
Grade-7
Easy
Question
Soaps are ______ based soapy detergents.
- Water
- Kerosene
- Petrol
- Oil
Hint:
Soaps have a substance that soften in hot/warm water.
The correct answer is: Oil
Soaps are Oil based soapy detergents.
Ordinary soap is made by mixing oils and fats with alkalis. Fats and oils of animal, vegetable, and mineral origin are broken down into free fatty acids and combined with alkalis to form raw soap. This is because fats and oils dissolve or soften in hot water and easily attach to the hydrophobic ends of soap molecules. This makes rinsing easier.
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Detergent is
- Sodium stearate
- Sodium alkyl sulfonate
- Gasoline
- Potassium pentanoate
Detergent is
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- Sodium stearate
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The non-metallic element that is purple black color is
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The non-metallic element that is purple black color is
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Which of the following solvents does iodine dissolve?
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- Carbon chloride
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Which is the 5th rare gas present in the atmosphere?
- He
- Ar
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Which is the 5th rare gas present in the atmosphere?
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- Ne
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_______ is the first and lightest noble gas.
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Among the following, the element possessing a low melting point is
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Which of the following is a property of a non-metal?
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Which of the following is a property of a non-metal?
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This group of elements has properties that are opposite those of metals. ______________________
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Which of the following electronic configuration represents chlorine?
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____ number of elements are present in the noble family.
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____ number of elements are present in the noble family.
ChemistryGrade-7
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Which noble gas has 18 protons?
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