Chemistry Practice Question and Answer
8 Q: The atomic mass of an element has the maximum number of electrons in its second orbit—
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5f86a83ddcf12a01a1418fb3- 12false
- 28true
- 310false
- 416false
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Answer : 2. "8"
Q: Crystallization is an example of
2158 05f742bd338027c5313ed6bc9
5f742bd338027c5313ed6bc9- 1Physical changetrue
- 2Chemical Transformationfalse
- 3Chemical reactionfalse
- 4Galvanizationfalse
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Answer : 1. "Physical change"
Q: The chemical name of limestone is?
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5f0eda3fb6738d790d13f5d3- 1Sodium Chloridefalse
- 2Sodium Sulphidefalse
- 3Calcium carbonatetrue
- 4Magnesium Chloridefalse
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Answer : 3. "Calcium carbonate "
Q: What is liberated when the base is dissolved in water?
2107 05f699109397b1a52908c9799
5f699109397b1a52908c9799- 1(OH) - iontrue
- 2H + ionfalse
- 3Both ionsfalse
- 4No ionfalse
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Answer : 1. "(OH) - ion"
Q: Which metal can be cut with a knife among sodium, lithium, calcium and nickel?
2104 061275c2293f02206607ea973
61275c2293f02206607ea973- 1Sodiumtrue
- 2Lithiumfalse
- 3calciumfalse
- 4allfalse
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Answer : 1. "Sodium"
Explanation :
Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.
Q: Which is the purest form of iron?
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5ed8a86454f88e519fa1af9a- 1Steelfalse
- 2Cast ironfalse
- 3Pig ironfalse
- 4Wrought irontrue
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Answer : 4. "Wrought iron "
Q: Which two atoms form an ionic bond? 2045 05b5cc604e4d2b4197774b4b7
5b5cc604e4d2b4197774b4b7- Show AnswerHide Answer
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Answer :
Explanation :
Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another.. This bond generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion. Example :: One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.
Q: Which acid is found in vinegar?
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5feb0482f6205c4d625d17c4- 1lactic acidfalse
- 2citric acidfalse
- 3Methanoic acidfalse
- 4Acetic acidtrue
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