Chemistry Practice Question and Answer
8 Q: The chemical name of limestone is?
1725 05f0eda3fb6738d790d13f5d3
5f0eda3fb6738d790d13f5d3- 1Sodium Chloridefalse
- 2Sodium Sulphidefalse
- 3Calcium carbonatetrue
- 4Magnesium Chloridefalse
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Answer : 3. "Calcium carbonate "
Q: Which of the below allotropes of carbon is in the form of geodesic globe?
1695 060828f7fbfeec334bc88fc0b
60828f7fbfeec334bc88fc0b- 1Fullerenetrue
- 2Carbon nanotubefalse
- 3Graphitefalse
- 4Diamondfalse
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Answer : 1. "Fullerene "
Q: Which two atoms form an ionic bond? 1691 05b5cc604e4d2b4197774b4b7
5b5cc604e4d2b4197774b4b7- Show 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 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: What is the systematic name of PbO? 1674 05b5cc5ffe4d2b4197774b412
5b5cc5ffe4d2b4197774b412- 1Plumbic oxidefalse
- 2Lead oxidefalse
- 3Lead(II) oxidetrue
- 4All of the abovefalse
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Answer : 3. "Lead(II) oxide"
Explanation :
Answer: C) Lead(II) oxide Explanation: The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name. PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.
Q: The melting point of tungsten is____.
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5f86a2598a599d39499a8013- 13,083 ° Cfalse
- 23,830 ° Cfalse
- 33,380 ° Ctrue
- 43,308 ° Cfalse
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Answer : 3. "3,380 ° C"
Q: Which gas is mostly present in Venus atmosphere?
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5ed600125ccf7008ed8ceeb9- 1Hydrogenfalse
- 2Carbon Dioxidetrue
- 3Heliumfalse
- 4Nitrogenfalse
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Answer : 2. "Carbon Dioxide"
Q: Which one of the following polymer is used in making bullet - proof vest?
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5f06e6dfb13c2d244adae1f1- 1Teflonfalse
- 2Polyurethanefalse
- 3Bakelitefalse
- 4Polyamidetrue
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