Chemistry-
General
Easy
Question
In blue Solution of copper sulphate excess of KCN is added then Solution becomes colourless due to the formation of
- Cu2+ get reduced to form
- CuCN
The correct answer is: Cu2+ get reduced to form
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The fibre which is less elastic is .............
The fibre which is less elastic is .............
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The soil which is suitable for growing cotton is...
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Oxygen differs from the otehr elements of the group. Compounds of oxygen with metals are more ionic in nature and hydrogen bonding is more important for oxygen compounds. Oxygen is never more than divalent because when it has formed two covalent bonds, there are no low energy orbitals which can be used to form further bonds. However, the elements S, Se, Te and Po have empty d-orbitals which may be used for bonding and they can form four or six bonds by unpairing eletctrons. However, the higher oxidation states becomes less stable on descending the group. p - dpThe bond between S and O or Se and O, are much shorter than might be expected for a single bond owing to p interaction between the p-orbital of oxygen and d-orbital of S or Se.
Which of the following statement is incorrect?
Oxygen differs from the otehr elements of the group. Compounds of oxygen with metals are more ionic in nature and hydrogen bonding is more important for oxygen compounds. Oxygen is never more than divalent because when it has formed two covalent bonds, there are no low energy orbitals which can be used to form further bonds. However, the elements S, Se, Te and Po have empty d-orbitals which may be used for bonding and they can form four or six bonds by unpairing eletctrons. However, the higher oxidation states becomes less stable on descending the group. p - dpThe bond between S and O or Se and O, are much shorter than might be expected for a single bond owing to p interaction between the p-orbital of oxygen and d-orbital of S or Se.
Which of the following statement is incorrect?
chemistry-General
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Statement - 1 : Reddish brown gas, NO2 when passed through alkalies gives nitrite only.
Statement – 2 : NO2 is acidic in nature and is a mixed anhydride of nitric and nitrous acids.
Statement - 1 : Reddish brown gas, NO2 when passed through alkalies gives nitrite only.
Statement – 2 : NO2 is acidic in nature and is a mixed anhydride of nitric and nitrous acids.
chemistry-General
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Which of the following can be reduced by HF?
Which of the following can be reduced by HF?
chemistry-General
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Which one of the following statements regarding helium is incorrect ?
Which one of the following statements regarding helium is incorrect ?
chemistry-General
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The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:
The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:
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A red liquid (A) when treated with sodium carbonate gives a mixture of two salts (B) and (C) in the Solution The mixture then on acidification with sulphuric acid and distillation produces the red liquid (A) again Which of the following statement is correct?
A red liquid (A) when treated with sodium carbonate gives a mixture of two salts (B) and (C) in the Solution The mixture then on acidification with sulphuric acid and distillation produces the red liquid (A) again Which of the following statement is correct?
chemistry-General
chemistry-
Ozone is an unstable, dark blue diamagnetic gasIt absorbs strongly the UV radiation, thus protecting the people on the earth from the harmful UV radiation from the sun The use of chlorofluorocarbon (CFC) in aero Sols and refrigerators, and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over the Antarctic, and Arctic Ozone acts as a strong oxidising agent in acidic and alkaline medium For this property ozone is used as a germicide and disinfectant for sterilising water and improving the atmosphere of crowded places
Identify the incorrect statement with respect to ozone
Ozone is an unstable, dark blue diamagnetic gasIt absorbs strongly the UV radiation, thus protecting the people on the earth from the harmful UV radiation from the sun The use of chlorofluorocarbon (CFC) in aero Sols and refrigerators, and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over the Antarctic, and Arctic Ozone acts as a strong oxidising agent in acidic and alkaline medium For this property ozone is used as a germicide and disinfectant for sterilising water and improving the atmosphere of crowded places
Identify the incorrect statement with respect to ozone
chemistry-General
chemistry-
The property of hydrides of p–block elements mostly depends on :
i) electronegativity difference between central atom and hydrogen
ii) size of central atom
iii) number of valence electrons in central atom Some undergo hydrolysis in which central atom is less electronegative, react with OH– to give hydrogen While acidic property of hydride in a period depends on electronegativity of central atoms, iemore electronegative is the n a group, acidic property is proportional to size of central atom Some electronIatom, more acidic is hydride deficient hydride behaves as Lewis acid while only one hydride of an element in p–block behaves as Lewis base with lone pair of electrons Hydrides in which central atom’s electronegativity is close to hydrogen has no reaction with water
Which one is the weakest acid among the following ? I</span
The property of hydrides of p–block elements mostly depends on :
i) electronegativity difference between central atom and hydrogen
ii) size of central atom
iii) number of valence electrons in central atom Some undergo hydrolysis in which central atom is less electronegative, react with OH– to give hydrogen While acidic property of hydride in a period depends on electronegativity of central atoms, iemore electronegative is the n a group, acidic property is proportional to size of central atom Some electronIatom, more acidic is hydride deficient hydride behaves as Lewis acid while only one hydride of an element in p–block behaves as Lewis base with lone pair of electrons Hydrides in which central atom’s electronegativity is close to hydrogen has no reaction with water
Which one is the weakest acid among the following ? I</span
chemistry-General
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The small size and high charge of Al3+ ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in Solution, and (c) high lattice energy of its compounds in the Sol. id state Thus aluminium can forms both covalent and ionic bond Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium Actually aluminium atoms complete their octets by forming dimers Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-Sol. vents like benzene while the corresponding boron halides exists as monomer In boron trihalides the extent of back bonding decreases with increase in size of halogens and thus lewis acid character increases All BX3 are hydroly sed by water but BF3 shows a different behavior.
Which one of the following statements is correct ?
The small size and high charge of Al3+ ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in Solution, and (c) high lattice energy of its compounds in the Sol. id state Thus aluminium can forms both covalent and ionic bond Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium Actually aluminium atoms complete their octets by forming dimers Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-Sol. vents like benzene while the corresponding boron halides exists as monomer In boron trihalides the extent of back bonding decreases with increase in size of halogens and thus lewis acid character increases All BX3 are hydroly sed by water but BF3 shows a different behavior.
Which one of the following statements is correct ?
chemistry-General
physics-
The diagram shows three infinitely long uniform line charges placed on the X, Y and Z axis. The work done in moving a unit positive charge from (1, 1, 1) to (0, 1, 1) is equal to
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physics-General
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A particle of mass 1 kg & charge 
is projected towards a non conducting fixed spherical shell having the same charge uniformly distributed on its surface. Find the minimum initial velocity of projection required if the particle just grazes the shell.
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physics-General
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A unit positive point charge of mass m is projected with a velocity V inside the tunnel as shown. The tunnel has been made inside a uniformly charged non conducting sphere. The minimum velocity with which the point charge should be projected such it can it reach the opposite end of the tunnel, is equal to
A unit positive point charge of mass m is projected with a velocity V inside the tunnel as shown. The tunnel has been made inside a uniformly charged non conducting sphere. The minimum velocity with which the point charge should be projected such it can it reach the opposite end of the tunnel, is equal to
physics-General
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Electric field given by the vector 
is present in the XY plane. A small ring carrying charge +Q, which can freely slide on a smooth non conducting rod, is projected along the rod from the point (0, L) such that it can reach the other end of the rod. What minimum velocity should be given to the ring? (Assume zero gravity)
Electric field given by the vector is present in the XY plane. A small ring carrying charge +Q, which can freely slide on a smooth non conducting rod, is projected along the rod from the point (0, L) such that it can reach the other end of the rod. What minimum velocity should be given to the ring? (Assume zero gravity)
physics-General
