Amphoteric exides are those which possess ------ properties?
Amphoteric exides are those which possess ------ properties?
Neutral and acidic | |
Acidic | |
Acidic and basic | |
Basic |
پاک اسٹڈی لائبریری اپنی خدمات کو بہتر کرنے کے لئے نئے سوفٹ وئیر انسٹال کررہی ہے ۔ اس لئے آئندہ کچھ دن آپ کو کچھ صفحات تک رسائی میں مشکلات کا سامنا ہوسکتا ہے ۔ جس کے لئے ہم معذرت خواہ ہیں۔
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Chemistry mcqs
Amorphous substances posses---------?
Amorphous substances posses---------?
No definite heat of fusion | |
No sharp melting points | |
No definite geometry | |
All of the above |
Among the halogens the rare element is--------?
Among the halogens the rare element is--------?
Astatine | |
Iodine | |
Fluorine | |
Chlorine |
Among halogens the highest boiling point is of----------?
Among halogens the highest boiling point is of----------?
Bromine | |
Flrorine | |
Chlorine | |
Iodine |
Ammonia may be prepared by heating ammonium chloride with--------?
Ammonia may be prepared by heating ammonium chloride with--------?
NaCl | |
Aqueous sodium hydroxide | |
Water | |
H2SO4 |
Amino acids present in cheese----------?
Amino acids present in cheese----------?
alanine | |
tyrosine | |
proline | |
lysine |
Aluminium oxide is---------?
Aluminium oxide is---------?
Amphoteric oxide | |
Acidic oxide | |
Basic oxide | |
It does not exists |
Alpha particles can be detected by using------?
Alpha particles can be detected by using------?
Barium sulphate | |
Thin Aluminium sheet | |
Zinc sulphide screen | |
Gold foils |
Alpha (α) particles are helium (He) nucleus with a charge of ----- ?
Alpha (α) particles are helium (He) nucleus with a charge of ----- ?
4e | |
e | |
3e | |
2e |
Allotropic form of phosphorus that is poisonous is----------?
Allotropic form of phosphorus that is poisonous is----------?
Red | |
Black | |
Violet | |
White |
All the transition elements show---------?
All the transition elements show---------?
Similar physical properties | |
Similar chemical properties | |
None | |
Both A and b |
All the following variables are used to describle gases except---------?
All the following variables are used to describle gases except---------?
density | |
volume | |
pressure | |
moles |
All the enthalpy changes are--------?
All the enthalpy changes are--------?
none | |
May or may not be A or B | |
Negative | |
Positive |
All the elements in group VIA are ---------- in nature?
All the elements in group VIA are ---------- in nature?
polymeric | |
all of above | |
metals | |
hygroscopic |
All proteins yield ------ upon complete hydrolysis?
All proteins yield ------ upon complete hydrolysis?
Nitrogen | |
Carbon and hydrogen | |
Sulphur | |
Amino acids |
All of the following were theorized by Bohr in his description of the atom except---------?
All of the following were theorized by Bohr in his description of the atom except---------?
Angular momentum of electrons in multiples of h/2? | |
Electrons revolve in discrete circular orbits | |
Electrons radiate energy continuously in a given orbit. | |
Energy of each electron is directly proportional to n2 |
Alkyl halides undergo a type of reaction---------?
Alkyl halides undergo a type of reaction---------?
Nucleophilic addition | |
Elimination | |
Nucleophilic substitution | |
both A & C |
Alkyl halides are considered to be very reactive compounds towards nucleophile because---------?
Alkyl halides are considered to be very reactive compounds towards nucleophile because---------?
they have an electrophilic carbon | |
they have a nucleophilic carbon & a good leaving group | |
they have an electrophilic carbon & a good leaving group | |
they have an electrophilic carbon & a bad leaving group |
Alkenes are produced from dehalogenation of--------?
Alkenes are produced from dehalogenation of--------?
vicinal dihalo alkane | |
dihalo alkane | |
trihalo alkane | |
vicinal trihalo alkane |
Alkanes containing a methyl group on main chain at 2nd carbon are called--------?
Alkanes containing a methyl group on main chain at 2nd carbon are called--------?
branched-alkane | |
iso-alkane | |
normal-alkane | |
neo-alkane |
Alkanes are also known as--------?
Alkanes are also known as--------?
both A & C | |
paraffins | |
saturated hydrocarbon | |
unsaturated hydrocarbon |
Alkali and alkaline earth metals impart colours when heated over burner. It is due to-------?
Alkali and alkaline earth metals impart colours when heated over burner. It is due to-------?
Smaller electronegativity of alkali metals | |
Smaller ionic radius of these metals | |
De-excitation of electrons from higher energy levels to low energy level | |
Excitation of electrons from low energy levels to higher energy levels |
Aldehyde and ketone have same general formula for homologous series---------?
Aldehyde and ketone have same general formula for homologous series---------?
CnH2n | |
n+1 | |
CnH2nO | |
2n |
Air is a/an -----?
Air is a/an -----?
Compound | |
B. Element | |
D. Mixture | |
C. Electrolyte |
AgCl dissolved with conc (2×10-2) Ksp will be---------?
AgCl dissolved with conc (2×10-2) Ksp will be---------?
3.6 x 10-6 | |
4 x 10-4 | |
7.2 x 10-6 | |
3.6 x 10-5 |