Chemistry-
General
Easy
Question
black coloured compound (A) on reaction with dilH2SO4 gives a gas (B) which on passing in a Solution of an acid (C) gives a white turbidity (D)Gas (B) when passed in an acidified Solution of a compound (E) gives a black precipitate (F) which is Soluble in hot concentrated (C)After boiling this Solution when excess of ammonia Solution is added, a blue coloured compound (G) is formed To the Solution of (E), on addition of acetic acid and aqpotassium ferrocyanide, a chocolate brown precipitate (H) is formed On addition of an aqueous Solution of BaCl2 to an aqueous Solution of (E) white precipitate in Soluble in HNO3 is obtained
When a piece of iron or zinc is added to the Solution of a compound (F) in hot concentrated (C) acid:
- a reddish brown precipitate is formed
- a white precipitate is formed
- a black precipitate is formed
- none of these
The correct answer is: a reddish brown precipitate is formed
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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?
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Which of the following statement is incorrect?
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The property of hydrides of p–block elements mostly depends on :
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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
