Tag: general introduction: importance and scope of chemistry

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Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is a compound?

  1. Baking soda

  2. Octane

  3. Hydrogen peroxide

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen peroxide is formed when two atoms of hydrogen form a bond with two atoms of oxygen that have bonded to each other. Octane is a hydrocarbon consisting of hydrogen and carbon. Sodium bicarbonate (baking soda) can be produced from the reaction of carbon dioxide with an aqueous solution of sodium hydroxide, which creates sodium carbonate; it is then combined with carbon dioxide molecules to produce sodium bicarbonate. All the compounds are made up of different elements and have properties different from their constituent element.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is not a mixture but a compound?

  1. Soda water

  2. Sea water

  3. Soil

  4. None of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the above examples are mixtures and not compounds. Mixtures are impure substance made up of two or more pure substances. They are not chemically mixed and can be separated by physical means.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Antimony and Arsenic belong to the category of:

  1. metals

  2. metalloids

  3. non-metals

  4. minerals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Antimony and Arsenic belong to the category of metalloids. A $metalloid$ is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Suppose an orbital may accommodate three electrons then the number of elements in 4th period will be?

  1. 12

  2. 27

  3. 18

  4. 32
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the fourth period of periodic table there is filling of 4s,3d,4p orbitals. So the total number of orbitals to be filled $=1(4s)+5(3d)+3(4P)=9$

If each orbital can hold maximum 3 electrons the number of elements$=3\times9=27$
Hence option B is correct answer.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which one of the following element forms interstitial compounds?

  1. $Fe$
  2. $Co$
  3. $Ni$
  4. $Sc$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Interstitial compounds are formed when small atoms like H, C, or N are trapped inside the crystal lattice of transition metals. While many transition metals form these, Nickel is a classic example of a metal that forms such compounds.