Acetic anhydride can be obtained by treating ethyl alcohol with
1.P2O5
2.H2SO4
3.Both a and b
4.PCI5
Addition of 2nd electron to a uninegative ion is always
1.Exothermic
2.Endothermic
3.Data is insufficient
4.Unpredictable
Allotropic form of phosphorus that is poisonous is
1.White
2.Red
3.Black
4.Violet
Amphoteric exides are those which possess ________ properties
1.Acidic
2.Basic
3.Acidic and basic
4.Neutral and acidic
An element has electronic conviguration 1s2 2s2 2p2. It belongs to
1.Group II-A
2.Group IV-A
3.Group VII-A
4.Group VI-A
Best position of hydrogen in the periodic table is above I.A Group which is mainly due to
1.Both are electropositive
2.Similar outer most shell electronic configuration
3.Both form ionic compounds
4.All
Compounds of nitrogen and phosphorus are mostly
1.ionic
2.covalent
3.polar
4.all varieties are possible
Deuterium reacts with oxygen to form
1.Hard water
2.Heavy water
3.Soft water
4.Water gas
Halides in which halogen atoms act as a bridge between two atoms of the other element are called
1.Covalent halides
2.Electronegative halides
3.Polymeric halides
4.Polymeric hydrides
Higher value of electron affinity means
1.Atom will lose electron easily
2.Atom will gain electron easily
3.Atom may form di-positive ion
4.The reason is unknown
Hydrogen resembles with carbon because of having
1.Same number of electrons in the valence shell
2.Similar physical state
3.Remarkable reducing properties
4.Homovalent (show same valency)
In which of the following pairs are elements belonging to the same group?
1.Boron & Beryllium
2.Nitrogen & Phosphorous
3.Magnesium & Aluminium
4.Gallium & Helium
Inner transition elements are called
1.Lanthanides
2.Actinides
3.Rare earth metals
4.All
Iodine is solid due to
1.Strong covalent bond
2.Large value of dipole moment
3.High polarizability
4.Strong hydrogen bonding
Ionization energy depends upon
1.Nuclear charge
2.Atomic size
3.Shielding effect
4.I.E depends upon all of the above and nature of orbital
Keeping in view the size of atom which order is correct one?
1.Mg > Sr
2.Ba > Mg
3.Lu > Ce
4.C1 > I
Less electronegative elements such as Be Ga A? etc form
1.Polymeric halide
2.Covalent halide
3.Ionic halide
4.All
Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way?
1.The nature of its oxides
2.The charge on its ions
3.The formula of its oxide
4.Its number of isotopes
Melting points of VII-A group elements down the group
1.Increase
2.Decrease
3.Remain constant
4.No regular trend
Metallic characters of alkali metals
1.Increase down the group
2.Decrease down the group
3.No regular trend
Modern periodic table has been divided in _______ blocks
1.2
2.4
3.7
4.8
Non-metals usually form ______________ oxides
1.Acidic
2.Amphoteric
3.Neutral
4.Neutral
Oxidation state of an atom represents
1.Number of electrons gained
2.Number of electrons lost
3.Apparent charge in compound
4.Its vacancies
Phosphene gas will be produced if phosphorous acid is subjected to
1.Oxidation
2.Reduction
3.Decomposition
4.Both b & c
Phosphorous acid upon thermal decomposition yields phosphoric acid and
1.Phosphine
2.Phosphorus
3.Water
4.Phosphorus pentoxide
Phosphorus is a Greek word and it means
1.Light bearing
2.Fire
3.Impure
4.Tetrahedral
Seventh period contains ______________ normal elements
1.2
2.4
3.6
4.8
Shielding effect across the period
1.Increases
2.Decreases
3.Can not be predicted
4.Remains constant
SO3 is not absorbed in water directly because
1.Reaction is exothermic
2.It is insoluble in water
3.Dilute acid is produced
4.All of above
The atomic radii decreases by increasing atomic number in
1.Alkali metal
2.Alkaline earth metal
3.Elements from Li to Ne
4.Halogens
The atoms of same element having same atomic number but different mass number are called
1.Isobars
2.Isomers
3.Isotopes
4.Isotropes
The composition of brown ring in nitrate test is
1.FeSO4.No
2.FeSO4.No2
3.FeSO4.No3
4.FeSO4.N2o
The most electronegative element among the following is
1.Sb
2.N
3.As
4.P
The property which increases upto group IV-A then decreases onwards
1.Ionization energy
2.Atomic radii
3.Melting & boiling points
4.Atomic volume
True increasing order of acidity of the oxides of Mn is
1.MnO < MnO2 < Mn2O7
2.Mn2O7 > MnO2 > MnO
3.MnO2 > MnO > Mn2O7
4.MnO2 > Mn2O7 > MnO
Which discovery caused a revision in the periodic law as stated by Mendeleev?
1.Location of nucleus by Rutherford
2.Atomic number by Moseley
3.X-rays by Roentgen
4.Natural radioactivity by Henry Bacquerel.
Which of the following cannot exist in solution
1.O-2
2.H+
3.Cl-
4.Na+
Which of the following does not contain phosphorus?
1.Yolk of egg
2.Bone
3.Nerves
4.Steel
Which of the following ion is stable in aqueous solution?
1.H+
2.H-
3.Cl-
4.All are stable
Which of the following is different with respect to physical appearance?
1.Arsenic
2.Phosphorus
3.Antimony
4.Bismuth
Which of the following possesses maximum hydration energy?
1.Na+
2.K+
3.Mg+2
4.Ca+2
Which of the following will give phosphoric acid one reaction with water
1.PCI5
2.P2O3
3.P2O5
4.All of the above
Which one of following is not a property of pure quartz?
1.Coloured solid
2.Brittle
3.Hard
4.All of above
Which one of the following compounds usually smells like garlic?
1.
2.P2O5
3.H3PO3
4.All have same smell
Which one of the following element has highest exidation state in its compounds?
1.Cr
2.Mn
3.Sn
4.O
Which one of the following is not a periodic property?
1.Melting point of elements
2.Boiling point of elements
3.Ionization energy of elements
4.Coordination number of ions
Which one of the following is not the use of graphite?
1.Lead pencils
2.Abrasive
3.Lubricant
4.Electrode of electrolytic cell
Which one of the following sets consists of all coinage metals?
1.Cu Hg Au
2.Cu Ag Au
3.Ag Au Hg
4.Cu Fe Au
Which one of the followings possesses melting point below 0?C?
1.Nitrogen
2.Phosphorus
3.Carbon
4.Bismuth
Which order of ionization energy is correct
1.Mg < A1
2.Si > P
3.Mg > A1
4.both b & c