Acetic anhydride can be obtained by treating ethyl alcohol with
1.P2O5
2.H2SO4
3.Both a and b
4.PCI5
Posted Date:-2021-09-09 04:18:10
Addition of 2nd electron to a uninegative ion is always
1.Exothermic
2.Endothermic
3.Data is insufficient
4.Unpredictable
Posted Date:-2021-09-09 04:18:10
Allotropic form of phosphorus that is poisonous is
1.White
2.Red
3.Black
4.Violet
Posted Date:-2021-09-09 04:18:10
Amphoteric exides are those which possess ________ properties
1.Acidic
2.Basic
3.Acidic and basic
4.Neutral and acidic
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Compounds of nitrogen and phosphorus are mostly
1.ionic
2.covalent
3.polar
4.all varieties are possible
Posted Date:-2021-09-09 04:18:10
Deuterium reacts with oxygen to form
1.Hard water
2.Heavy water
3.Soft water
4.Water gas
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
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)
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Inner transition elements are called
1.Lanthanides
2.Actinides
3.Rare earth metals
4.All
Posted Date:-2021-09-09 04:18:10
Iodine is solid due to
1.Strong covalent bond
2.Large value of dipole moment
3.High polarizability
4.Strong hydrogen bonding
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Keeping in view the size of atom which order is correct one?
1.Mg > Sr
2.Ba > Mg
3.Lu > Ce
4.C1 > I
Posted Date:-2021-09-09 04:18:10
Less electronegative elements such as Be Ga A? etc form
1.Polymeric halide
2.Covalent halide
3.Ionic halide
4.All
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Melting points of VII-A group elements down the group
1.Increase
2.Decrease
3.Remain constant
4.No regular trend
Posted Date:-2021-09-09 04:18:10
Metallic characters of alkali metals
1.Increase down the group
2.Decrease down the group
3.No regular trend
Posted Date:-2021-09-09 04:18:10
Modern periodic table has been divided in _______ blocks
1.2
2.4
3.7
4.8
Posted Date:-2021-09-09 04:18:10
Non-metals usually form ______________ oxides
1.Acidic
2.Amphoteric
3.Neutral
4.Neutral
Posted Date:-2021-09-09 04:18:10
Oxidation state of an atom represents
1.Number of electrons gained
2.Number of electrons lost
3.Apparent charge in compound
4.Its vacancies
Posted Date:-2021-09-09 04:18:10
Phosphene gas will be produced if phosphorous acid is subjected to
1.Oxidation
2.Reduction
3.Decomposition
4.Both b & c
Posted Date:-2021-09-09 04:18:10
Phosphorous acid upon thermal decomposition yields phosphoric acid and
1.Phosphine
2.Phosphorus
3.Water
4.Phosphorus pentoxide
Posted Date:-2021-09-09 04:18:10
Phosphorus is a Greek word and it means
1.Light bearing
2.Fire
3.Impure
4.Tetrahedral
Posted Date:-2021-09-09 04:18:10
Seventh period contains ______________ normal elements
1.2
2.4
3.6
4.8
Posted Date:-2021-09-09 04:18:10
Shielding effect across the period
1.Increases
2.Decreases
3.Can not be predicted
4.Remains constant
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
The atomic radii decreases by increasing atomic number in
1.Alkali metal
2.Alkaline earth metal
3.Elements from Li to Ne
4.Halogens
Posted Date:-2021-09-09 04:18:10
The atoms of same element having same atomic number but different mass number are called
1.Isobars
2.Isomers
3.Isotopes
4.Isotropes
Posted Date:-2021-09-09 04:18:10
The composition of brown ring in nitrate test is
1.FeSO4.No
2.FeSO4.No2
3.FeSO4.No3
4.FeSO4.N2o
Posted Date:-2021-09-09 04:18:10
The most electronegative element among the following is
1.Sb
2.N
3.As
4.P
Posted Date:-2021-09-09 04:18:10
The property which increases upto group IV-A then decreases onwards
1.Ionization energy
2.Atomic radii
3.Melting & boiling points
4.Atomic volume
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
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.
Posted Date:-2021-09-09 04:18:10
Which of the following cannot exist in solution
1.O-2
2.H+
3.Cl-
4.Na+
Posted Date:-2021-09-09 04:18:10
Which of the following does not contain phosphorus?
1.Yolk of egg
2.Bone
3.Nerves
4.Steel
Posted Date:-2021-09-09 04:18:10
Which of the following ion is stable in aqueous solution?
1.H+
2.H-
3.Cl-
4.All are stable
Posted Date:-2021-09-09 04:18:10
Which of the following is different with respect to physical appearance?
1.Arsenic
2.Phosphorus
3.Antimony
4.Bismuth
Posted Date:-2021-09-09 04:18:10
Which of the following possesses maximum hydration energy?
1.Na+
2.K+
3.Mg+2
4.Ca+2
Posted Date:-2021-09-09 04:18:10
Which of the following will give phosphoric acid one reaction with water
1.PCI5
2.P2O3
3.P2O5
4.All of the above
Posted Date:-2021-09-09 04:18:10
Which one of following is not a property of pure quartz?
1.Coloured solid
2.Brittle
3.Hard
4.All of above
Posted Date:-2021-09-09 04:18:10
Which one of the following compounds usually smells like garlic?
1.
2.P2O5
3.H3PO3
4.All have same smell
Posted Date:-2021-09-09 04:18:10
Which one of the following element has highest exidation state in its compounds?
1.Cr
2.Mn
3.Sn
4.O
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Which one of the following is not the use of graphite?
1.Lead pencils
2.Abrasive
3.Lubricant
4.Electrode of electrolytic cell
Posted Date:-2021-09-09 04:18:10
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
Posted Date:-2021-09-09 04:18:10
Which one of the followings possesses melting point below 0?C?
1.Nitrogen
2.Phosphorus
3.Carbon
4.Bismuth
Posted Date:-2021-09-09 04:18:10
Which order of ionization energy is correct
1.Mg < A1
2.Si > P
3.Mg > A1
4.both b & c
Posted Date:-2021-09-09 04:18:10