d and f Block Elements Important Questions:
Ques. Which of the following is ferromagnetic?
(a) Cr
(b) Mn
(c) W
(d) Co
Ques. Zn and Hg belong to the same group, they differ in many of their properties. The property that is shared by both is
(a) They form oxide readily
(b) They react with steam readily
(c) They react with hot concentrated sulphuric acid
(d) They react with hot sodium hydroxide
Ques. The most stable oxidation state of Mn is
(a) +2
(b) +4
(c) +5
(d) +7
Ques. Most powerful oxidizing property of manganese is shown by which of the following oxidation state
(a) Mn(+7)
(b) Mn(+2)
(c) Mn(+4)
(d) Mn(+5)
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Ques. The number of unpaired electrons in Mn+3 is
(a) 4
(b) 3
(c) 2
(d) Zero
Ques. Which one of the following is highest melting halide?
(a) AgCl
(b) AgBr
(c) AgF
(d) Agl
Ques. One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium
(a) 1
(b) 3
(c) 5
(d) 6
Ques. Silver nitrate is mainly used
(a) In photography
(b) In model formation
(c) As reducing agent
(d) As dehydrating agent
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Ques. The atomic radii from Cr to Cu is almost identical because of
(a) Increasing nuclear charge from Cr to Cu
(b) Repulsion among increased electrons
(c) Increased screening effect to nullify increased nuclear charge
(d) All of these
Ques. The equivalent weight of potassium permanganate for acid solution is
(a) 158
(b) 31.6
(c) 52.16
(d) 79
Ques. Which of the following pair of transitional elements exhibit highest and lowest density?
(a) Os and Sc
(b) Os and Pt
(c) Hg and Sc
(d) Os and Ir
Ques. In acidic medium one mole of MnO4– accepts how many moles of electrons in a redox process ?
(a) 1
(b) 3
(c) 5
(d) 6
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Ques. The highest oxidation state of Cr will be
(a) 2
(b) 3
(c) 4
(d) 6
Ques. Effective magnetic droment of Sc+3 ion is
(a) 1.73
(b) 0
(c) 5.92
(d) 2.83
Ques. Variable valency is shown by
(a) Na
(b) Cu
(c) Mg
(d) Al
Ques. What is the name of element with atomic number 105?
(a) Kurchatovium
(b) Dubnium
(c) Nobelium
(d) Holmium
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Ques. Which of the following transition metal is present in misch metal?
(a) La
(b) Sc
(c) Ni
(d) Cr
Ques. While writing the formula of ferrous oxide it is written as (FeO), because it is
(a) Non-stoichiometric
(b) Non-existant
(c) Paramagnetic
(d) Ferromagnetic
Ques. Variable valency is shown by
(a) Typical elements
(b) Normal elements
(c) Transition elements
(d) None of these
Ques. Which of the following statements is correct about equivalent weight of KMnO4?
(a) It is one third of its molecular weight in alkaline medium
(b) It is one fifth of its molecular weight in alkaline medium
(c) It is equal to its molecular weight in acidic medium
(d) It is one third of its molecular weight in acidic medium
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Ques. Transition metals are related to which block
(a) s-block
(b) p-block
(c) d-block
(d) None of these
Ques. The term platforming is
(a) Platinum painting
(b) Flat sheet of platinum
(c) Platinum manufacturing
(d) Platinum used as a catalyst
Ques. Paramagnetism is exhibited by molecules
(a) Not attracted in a magnetic field
(b) Containing only paired electrons
(c) Carrying a positive charge
(d) Carrying unpaired electrons
Ques. Permanent magnet is made from
(a) Cast iron
(b) Steel
(c) Wrought Iron
(d) All of these
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Ques. Which is most reactive metal?
(a) Fe
(b) Pt
(c) Ni
(d) Co
Ques. To obtain steel entirely free from sulphur and phosphorus, the process used is
(a) Electrothermal process
(b) Bessemer process
(c) Open-hearth process
(d) Duplex process
Ques. The metal which is the best conductor of electricity is
(a) Iron
(b) Copper
(c) Silver
(d) Aluminium
Ques. Zinc when reacted with excess of NaOH gives
(a) Zinc hydroxide
(b) Zinc oxide
(c) Di sodium zincate
(d) Sodium zincate
Ques. Which of the following metals will not react with a solution of CuSO4?
(a) Fe
(b) Zn
(c) Mg
(d) Hg
Ques. While extracting an element from its ore, the ore is ground and leached with dilute KCN solution to form the soluble product potassium argentocyanide. The element is
(a) Lead
(b) Chromium
(c) Manganese
(d) Silver
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