Chemistry Questions Practice Question and Answer
8 Q: In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n+2 (n = 0,1,2,3 etc.)?
517 0647de965e72c4684a1dcb8b3
647de965e72c4684a1dcb8b3- 1Jacob Berzeliusfalse
- 2Erich Huckeltrue
- 3Antoine Lavoisierfalse
- 4Auguste Laurentfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "Erich Huckel"
Q: German silver used for making utensils is an alloy of
1903 05ed88dbbb516791f26501eea
5ed88dbbb516791f26501eea- 1copper silver nickelfalse
- 2copper zinc nickeltrue
- 3copper zinc aluminumfalse
- 4copper nickel aluminumfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "copper zinc nickel "
Q: Which one of the following polymer is used in making bullet - proof vest?
1417 05f06e6dfb13c2d244adae1f1
5f06e6dfb13c2d244adae1f1- 1Teflonfalse
- 2Polyurethanefalse
- 3Bakelitefalse
- 4Polyamidetrue
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "Polyamide "
Q: Which two atoms form an ionic bond? 1353 05b5cc604e4d2b4197774b4b7
5b5cc604e4d2b4197774b4b7- Show AnswerHide Answer
- Workspace
- SingleChoice
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: Percentage of lead in lead pencil is:
1190 05ed62769436d8a49583c61d8
5ed62769436d8a49583c61d8- 1zerotrue
- 220false
- 380false
- 47false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "zero "
Q: Which is the purest form of iron?
1498 05ed8a86454f88e519fa1af9a
5ed8a86454f88e519fa1af9a- 1Steelfalse
- 2Cast ironfalse
- 3Pig ironfalse
- 4Wrought irontrue
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "Wrought iron "
Q: If the pH value of a substance is lower than 7, it would be considered as–
1001 05ee85e95109b5d6e015e3b7b
5ee85e95109b5d6e015e3b7b- 1Neutralfalse
- 2Basefalse
- 3Acidtrue
- 4Ionfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "Acid"
Q: Table salt gets moist during rainy season because -
2189 05f2cf6ad79b9e641a7606520
5f2cf6ad79b9e641a7606520- 1sodium chloride contains some quantity of sodium iodidefalse
- 2sodium chloride contains hygroscopic impurities like - magnesium chloridetrue
- 3sodium chloride Is hygroscopicfalse
- 4sodium chloride is deliquescentfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice