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14 followers study24x7 10 Sep 2021 02:35 PM study24x7 study24x7

Smoke is an example of #NTA #NEET #NEETquestion #mcq #2021 #chemistry

A

Gas dispersed in liquid

B

Gas dispersed in solid

C

Solid dispersed in gas

D

Solid dispersed in solid

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  • Ankit Rathi
  • Smoke is an example of solid aerosol in which dispersed phase is solid and dispersion medium is gas.
    14 followers study24x7 10 Sep 2021 02:34 PM study24x7 study24x7

    The stability of lyophilic colloids is due to #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Charge on their particles

    B

    A layer of dispersion medium on their particles

    C

    The smaller size of their particles

    D

    The large size of their particles

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  • Ankit Rathi
  • The stability of lyophilic as well as lyophobic colloids is due to presence of charge on the particles.
    14 followers study24x7 10 Sep 2021 02:34 PM study24x7 study24x7

    Purification of colloids is done by the process of #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Electrophoresis

    B

    Electrodispersion

    C

    Peptization

    D

    Ultra-filteration

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  • Ankit Rathi
  • In purification separation of colloids from crystalloids is done by the process of ultra-filtration.
    14 followers study24x7 10 Sep 2021 02:33 PM study24x7 study24x7

    Sky looks blue due to #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Dispersion effect

    B

    Reflection

    C

    Transmission

    D

    Scattering

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  • Ankit Rathi
  • When the light passes through the atmosphere then it is subjected to the different types of molecules of the air and gases in the atmosphere. As we all know that the air is a colloidal mixture of the solid sol and the colloidal solution will make the light scatter when the light passes through it.
    14 followers study24x7 10 Sep 2021 02:33 PM study24x7 study24x7

    Starch dispersed in hot water is an example of #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Emulsion

    B

    Hydrophobic sol

    C

    Lyophilic sol

    D

    Associated colloid

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  • Ankit Rathi
  • Starch forms lyophilic sol when water is used as the dispersion medium. The formation of sol is accelerated by heating.
    14 followers study24x7 10 Sep 2021 02:33 PM study24x7 study24x7

    Gold number is associated with #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Only lyophobic colloids

    B

    Only lyophilic colloids

    C

    Both lyophobic and lyophilic colloids

    D

    None of these

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  • Ankit Rathi
  • Gold number is assoicated with only lyophilic colloids due to protective nature.
    14 followers study24x7 10 Sep 2021 02:32 PM study24x7 study24x7

    Shape-selective catalysis is a reaction catalysed by #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    zeolites

    B

    enzymes

    C

    platinum

    D

    Ziegler-Natta catalyst.

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  • Ankit Rathi
  • Zeolite is a most widely studied shape-selective catalyst. Shape selectivity of zeolite depends upon between 260 pm to 740 pm.
    14 followers study24x7 10 Sep 2021 02:32 PM study24x7 study24x7

    Enzymes with two sites are called #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Apoenzyme

    B

    Holoenzyme

    C

    Allosteric enzyme

    D

    Conjugate enzyme

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  • Ankit Rathi
  • Enzymes with two active sites are called allosteric enzymes. One of these sites is the catalytic site for the concerned reaction. Other site may be the site for inhibition of catalysis by enzymes.
    14 followers study24x7 10 Sep 2021 02:32 PM study24x7 study24x7

    Noble gases are adsorbed by #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Anhydrous calcium chloride

    B

    Ferric hydroxide

    C

    Conc. H2SO4

    D

    Activated coconut charcol

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  • Ankit Rathi
  • Noble gases are adsorbed by coconut charcoal. The adsorption of different noble gases occurs at different temperatures. Hence, charcoal is used to separate these gases.
    14 followers study24x7 10 Sep 2021 02:31 PM study24x7 study24x7

    Adsorption is multilayer in the case of #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Physical adsorption

    B

    Chemisorption

    C

    Both

    D

    None of both

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  • Ankit Rathi
  • Physical adsorption involves multilayer adsorption
    14 followers study24x7 10 Sep 2021 02:31 PM study24x7 study24x7

    The rate at which a substance reacts depends on its #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Atomic weight

    B

    Equivalent weight

    C

    Molecular weight

    D

    Active mass

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  • Ankit Rathi
  • The rate at which a substance reacts depends upon its active mass as the rate of reaction is directly proportional to concentration of each reactant and product.
    14 followers study24x7 10 Sep 2021 02:31 PM study24x7 study24x7

    what is the si unit of electric current #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Ohm

    B

    Volt

    C

    Ampere

    D

    Coulomb

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  • Ankit Rathi
  • si unit of electric current is Ampere
    14 followers study24x7 10 Sep 2021 02:30 PM study24x7 study24x7

    The unit of electrochemical equivalent is #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Gram

    B

    Gram/ampere

    C

    Gram/coulomb

    D

    Coulomb/gram

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  • Ankit Rathi
  • Electrochemical equivalent is the mass of substance of deposited or liberated on an electrode per SI unit that is per Coulomb of charge.
    14 followers study24x7 10 Sep 2021 02:30 PM study24x7 study24x7

    the equivalent weight of a certain trivalent element is 20. #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    152

    B

    56

    C

    168

    D

    68

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  • Ankit Rathi
  • Atomic mass of element= Equivalent mass of element × Valency=20×3=60g/mol \ The oxide can be represented as E2 O3 where E represents element. The molecular weight of oxide is 2(60)+3(16)=168g/mol
    14 followers study24x7 10 Sep 2021 02:30 PM study24x7 study24x7

    Which of the following does not conduct electricity? #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Fused NaCl

    B

    Solid NaCl

    C

    Brine solution

    D

    Copper

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  • Ankit Rathi
  • Solid NaCl does not conduct electricity due to absence of free ions.
    14 followers study24x7 10 Sep 2021 01:42 PM study24x7 study24x7

    In the electrolytic cell flow of electrons is from #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Cathode to anode in solution

    B

    Cathode to anode through external supply

    C

    Cathode to anode through internal supply

    D

    Anode to cathode through internal supply

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  • Ankit Rathi
  • In the electrolytic cell, the electrons flow from cathode to anode through internal supply.
    14 followers study24x7 10 Sep 2021 01:41 PM study24x7 study24x7

    electrolysis involves oxidation and reduction respectively at #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Anode and cathode

    B

    Cathode and anode

    C

    At both the electrodes

    D

    None of the above

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  • Ankit Rathi
  • In electrolysis process oxidation occurs at anode and reduction occurs at cathode.
    14 followers study24x7 10 Sep 2021 01:40 PM study24x7 study24x7

    Which of the following is not a non electrolyte #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Acetic acid

    B

    Glucose

    C

    Ethanol

    D

    Urea

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  • Ankit Rathi
  • Correct answer is Acetic Acid Electrolytic substances are classified as strong or weak according to how readily they dissociate into conducting ions.
  • Tejeshwar Ahirwar
  • Yeh question glt hai
    14 followers study24x7 10 Sep 2021 01:40 PM study24x7 study24x7

    which one of the following is a good conductor of electricity #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Diamond

    B

    Graphite

    C

    Both A and B

    D

    None of  the above

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  • Ankit Rathi
  • Diamond and graphite are allotropes of carbon. Graphite has carbon molecules held together by weak van der Waal's forces of attraction and they have loosely bound electrons which are responsible for conducting electricity.
    14 followers study24x7 10 Sep 2021 01:39 PM study24x7 study24x7

    When a molten ionic hydride is electrolysed #NTA #NEET #NEETquestion #mcq #2021 #chemistry

    A

    Hydrogen is liberated at the cathode

    B

    Hydrogen is liberated at the anode

    C

    There is no reaction

    D

    − H ions produced migrate to the cathode

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  • Ankit Rathi
  • hydrogen is liberate at the anode On electrolysis molten ionic hydride liberate H2 gas at the anode.
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