Tag: look, learn and experience

Quizzes (3) Questions (109)

Questions Related to look, learn and experience

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.

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

Most of the work on Transuranic element was done by 

  1. Bohr

  2. Seaborg

  3. Mc Millan

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

Glenn T. Seaborg led the team that discovered and researched most of the transuranic elements (elements with atomic numbers greater than 92), including plutonium, americium, curium, and others.

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

How many elements is expected in period number 10 of the periodic table?

  1. 68

  2. 72

  3. 50

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

The number of elements in a period is determined by the number of orbitals being filled. For period n, the number of elements is given by 2 * (n+1)^2 / 4 or similar patterns; for period 10, the calculation leads to 72 elements based on the filling of 8s, 5g, 6f, 7d, and 8p orbitals.