JEE-Main - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9838
Match the species given in Column I with
the shape given in Column II and mark the correct option.
read moreJEE-Main - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9839Match the items in Column I and Column II
and mark the correct option.
Column I... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9843On addition of small amount of KMnO4
to concentrated H2SO4, a green oily compound is
obtained which is highly explosive in nature. Identify the compound from the
following.
(a)
(b) ... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9844The magnetic nature of elements depends
on the presence of unpaired electrons. Identify the configuration of
transition element, which shows highest magnetic moment.
Hint: This problem is based on
calculation of magnetic moment can be ... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9845Which of the following oxidation state is
common for all lanthanoids?
(a) +2
(b) +3
(c) +4
(d) +5 Answer: (b) Lanthanoids show common state of +3.
Some of which also show +2 and +4 stable oxidation state alongwith +3
oxidation st... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9846When KMnO4 solution is needed
to oxalic acid solution, the decolourisation is slow the beginning but
becomes instantaneous after some time because
(a) CO2 is formed as the
product
(b) Reaction is exothermic
(c) read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9848Which of the following is amphoteric
oxide?
(a) ,
(b)
(c) read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9850The magnetic moment is associated with
its spin angular momentum an orbital angular momentum. Spin only magnetic
moment value of Cr3+ ion is
(a) 2.87 BM
(b) 3.87 BM
(c) 3.47 BM
(d) 3.57 BM Answer: (b) The magnetic moment is associat... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9851When acidified solution is
added to salt then changes to
(a) Sn
(b) Sn3+
(c) Sn4+
(d) Sn+ Answer: read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9852Although zirconium belongs to 4d
transition series and hafnium to 5d transition series even then they
show similar physical and chemical properties because……………. .
(a) both belong to d-block
(b) both have some num... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9853Which of the following actinoids show
oxidation states upto +7?
(a) Am
(b) Pu
(c) U
(d) Np Answer: (b, d)
The oxidation states of the following
actinoids are
(a) Americium (Z = 95); Electronic
configuration =
Oxidation... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9854General electronic configuration of
actinoids is
(a) U (Atomic number. 92)
(b) Np (Atomic number. 93)
(c) Pu (Atomic number. 94)
(d) Am (Atomic number. 95) Answer: (a, b)
General electronic configuration of
actinoids is U and
... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9855Which of the following lanthanoids show
+2 oxidation state besides the characteristics oxidation state +3 of
lanthanoids?
(a) Ce
(b) Eu
(c) Yb
(d) Ho Answer: (b, c)
(a) Cerium (Z = 57) Electronic
configuration =
Oxidatio... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9857Why E- values for Mn, Ni and
Zn are more negative than expected? Answer: Negative values of Mn2+ and Zn2+
are related to stabilities of half-filled and completely filled configuration
respectively. But for Ni2+, E̊ value is related to
... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9859Out of and , which is more
stable and why? Answer: Among and, is more stable.
Stability of complex can be explained on the basis of stabilit... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9860When a brown compound of manganese (A) is
treated with HCI it gives a gas (B). The gas taken in excess, reacts with NH3
to give an explosive compound (C). Identify compounds A, B and C. Answer: MnO2 is the brown compound of
Mn which reacts w... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9862Explain why does colour of KMnO4
disappear when oxalic acid is added to its solution in acidic medium? Answer: When oxalic acid is added to acidic
solution of KMnO4, its colour disappear due to reduction of ion to Mn2+.
Chemical reaction oc... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9863When orange solution containing ion is treated
with an alkali, a yellow solution is formed and when H+ ions are
added to yellow solution, an orange solution is obtained. Explain why does
this happen? Answer: When orange solution containing i... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9864 of Cu is +0.34V
while that of Zn is -0.76 V. Explain. Answer: value of Cu is
positive because of the fact that sum of sublimation enthalpy ... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9866Match the catalysts given in Column I
with the process given in Column II.
Column I
... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9869Match the property given in Column I with
the element given in Column II.
Column I
... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9870Identify A to E and also explain the
reaction involved.
Answer: The substances from A to E
A = Cu; B = ; C = ; D = ; E =
Reactions:
(i) read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9871When an oxide of manganese (A) is fused
with KOH in the presence of an oxidizing agent and dissolved in water, it
gives a dark green solution of compound (B). Compound (B) disproportionates
in neutral or acidic solution to give purple compou... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9872(a) Answer the following questions
(i) Which element of the first transition
series has highest second ionization enthalpy?
(ii) Which element of the first
transition series has highest third ionization enthalpy?
(iii) Which element of... read moreJEE-Main - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9873Gadolinium belongs to 4f series.
Its atomic number is 64. Which of the following is the correct electronic
configuration of gadolinium?
(a)
(b) read more
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