General Science - Chemistry MCQs

21. A baby diaper, if tested with various solutions, will absorb maximum amount of which among the following:
[A] Distill Water
[B] Drinking water
[C] Hard water
[D] Urine

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22. Now a days, a little pack of Silica Gel (granular beads of Silica made from Sodium Silicate) comes with many products to control humidity and avoid spoilage or degradation of some goods. Which among the following property of Silica gel makes it useful for that purpose?
[A] Silica gel molecules are hydrophilic with large surface area and so its molecules trap the moisture
[B] Silica gel is a Hygroscopic substance with large surface area so its molecules absorb the moisture.
[C] Silica gel molecules are with a portion that is charge-polarized and capable of hydrogen bonding, thus bonds with the water molecules
[D] The semi permeable pouch in which silica gel is placed absorbs the moisture which later reacts with water.

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23. Which among the following is the correct almost equivalent to 1 MMBTU Natural Gas ?
[A] 1.054615 gigajoule
[B] 0.1054615 gigajoul
[C] 10.54615 gigajoule
[D] 105.4615 gigajoule

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24. Consider the following statements: 
1. The space between the valence and conduction bands is zero in Graphene
2. This property of Graphene makes it an excellent transistor of commercial viability
Which among the above statements is/ are correct?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

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25. Pyrolusite, Braunite, Psilomelane and Rhodochrosite are the ores of which among the following: 
1. Manganese 
2. Aluminium 
3. Copper 
Choose the correct option:
[A] Only 1
[B] Only 1 & 2
[C] Only 3
[D] Only 1 & 3

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26. Consider the following statements: 
1. Copernicium is at present highest-numbered element recognized by IUPAC
2. Copernicum has been synthesized in the lab by a nuclear reaction of Zinc and Lead Isotopes 
Which among the above statements is / are correct?
[A] Only 1 is correct
[B] Only 2 is correct
[C] Both 1 & 2 are correct
[D] Neither 1 nor 2 are correct

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27. The first metal to be used by man was:

[A] Aluminum
[B] copper
[C] Iron
[D] Silver

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28. For respiration in deep sea, divers use mixture of:
[A] Oxygen and helium
[B] Oxygen and hydrogen
[C] Oxygen and carbon dioxide
[D] Oxygen, Helium & nitrogen

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29. The minimum temperature at which a combustible substance catches fire is called:
[A] fireless temperature
[B] ignition temperature
[C] static temperature
[D] optimum temperature

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30. Consider the following statements regarding Graphene and Fullerene:

  1. Graphene is 2 dimensional , Fullerene is generally 3 dimensional
  2. Graphene is SP2 allotrope of Carbon, while Fullerene is SP3 allotrope of Carbon
  3. Graphene does not dissolve in petrol but fullerenes dissolve

Which among the above statements is / are correct?

[A] Only 1 is correct
[B] Only 2 is correct
[C] Only 3 is correct
[D] 1 & 3 are correct

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