Tag: look, learn and experience

Questions Related to look, learn and experience

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

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

  1. Soda water

  2. Sea water

  3. Soil

  4. None of above

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Correct Option: D
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.

Antimony and Arsenic belong to the category of:

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

  1. metals

  2. metalloids

  3. non-metals

  4. minerals

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Correct Option: B
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.

Consider the following classification.
Lotus, Rose, Tiger, Cactus
Which of the following is not suitable in given classification. 

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

  1. Lotus

  2. Rose

  3. Tiger

  4. Cactus

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Correct Option: C
Explanation:

In the given classification, the Tiger is not suitable as it is animal and all the others are plants.

Which of the following is compounds contain only two chemical elements?

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

  1. Hydrogen peroxide

  2. Ammonia

  3. Water

  4. Sugar

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Correct Option: A,B,C
Explanation:

Hydrogen peroxide $= H _2O _2$

Ammonia $=  NH _3$
Water $ = H _2O$

Which of the following classification is not correct.
1. Pen - Non-living thing
2. Lion- Animal
3. Rose - Mammal

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

  1. 1

  2. 2

  3. 3

  4. nonw of these

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Correct Option: C
Explanation:

Rose is not correctly classified as it is a plant, not mammal. Mammals are the types of animal.

Baking soda is a compound.

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

  1. True

  2. False

  3. Either

  4. Neither

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Correct Option: A
Explanation:

Baking soda (sodium hydrogen carbonate $ \displaystyle (NaHCO _3)$ or sodium bicarbonate ) is a compound. It is formed by chemical combination of elements $Na, \ H, \ C, \ O $.

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

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

  1. 12

  2. 27

  3. 18

  4. 32

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Correct Option: B
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.

Which one of the following element forms interstitial compounds?

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

  1. $Fe$

  2. $Co$

  3. $Ni$

  4. $Sc$

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Correct Option: C

Most of the work on Transuranic element was done by 

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

  1. Bohr

  2. Seaborg

  3. Mc Millan

  4. Slater

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Correct Option: A

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

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

  1. 68

  2. 72

  3. 50

  4. 32

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Correct Option: B