MCQ 11 Mark
Identify the element if it's observed and expected electronic configuration remains same as $[ Ar ] 3 d ^1 4 s ^2$.
- ✓sc
- Bti
- Cv
- Dco
Answer
View full question & answer→Correct option: A.
sc
Questions
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85 questions · 82 auto-graded MCQ + 3 self-marked written.
MCQ 21 Mark
Identify the strongest base from following
- A$\operatorname{Pr}( OH )_3$
- B$Lu ( OH )_3$
- ✓$La ( OH )_3$
- D$Sm ( OH )_3$
Answer
View full question & answer→Correct option: C.
$La ( OH )_3$
MCQ 31 Mark
Identify the element with smallest ionic radius in +3 oxidation state from following.
- AYb
- BEr
- CEu
- ✓Lu
Answer
View full question & answer→Correct option: D.
Lu
D
MCQ 41 Mark
Which among the following properties of lanthanoids is NOT true?
- AGood conductors of heat and electricity.
- ✓All are non radioactive elements.
- CHave greater coordination number than six.
- DStrongly paramagnetic.
Answer
View full question & answer→Correct option: B.
All are non radioactive elements.
B
MCQ 51 Mark
Identify the correct decreasing order of atomic radii from following.
- A$Pm > Yb > Ce > Tm$
- ✓$ Ce > Pm > Tm > Yb$
- C$Tm > Pm > Yb$
- D$Pm > Tm > Ce > Yb$
Answer
View full question & answer→Correct option: B.
$ Ce > Pm > Tm > Yb$
MCQ 61 Mark
What is the quantity of dehydrated water when $34.2 g$ cane sugar is treated with conc. $H _2 SO _4$ under normal conditions of temperature and pressure?
- A34.2g
- B11.0g
- ✓19.8g
- D39.6g
Answer
View full question & answer→Correct option: C.
19.8g
C
MCQ 71 Mark
Which from following alloys is used to construct marine condenser tubes of ships?
- ATitanium alloys
- BBronze
- ✓Cupra$-$nickel
- DNichrome
Answer
View full question & answer→Correct option: C.
Cupra$-$nickel
MCQ 81 Mark
Which among the following elements do not have any electron in f$-$sub shell either in expected or in observed state electronic configuration?
- A$Eu ( Z =63)$
- B$Lu ( Z =71)$
- C$Nd ( Z =60)$
- ✓$La ( Z =57)$
Answer
View full question & answer→Correct option: D.
$La ( Z =57)$
MCQ 91 Mark
Which among the following elements in their respective oxidation states develops lowest spin only magnetic moment ? $($Atomic number $Cu =29, Fe =26, Ni =28, Co =27 )$
- ✓$Cu ^{2+}$
- B$Fe ^{2+}$
- C$Ni ^{2+}$
- D$Co ^{2+}$
Answer
View full question & answer→Correct option: A.
$Cu ^{2+}$
MCQ 101 Mark
What is total number of unpaired electrons present in observed electronic configuration of $\operatorname{Cr}(Z=24) ?$
- A$4$
- B$3$
- ✓$6$
- D$5$
Answer
View full question & answer→Correct option: C.
$6$
MCQ 111 Mark
Which from following alloys is used for ultra high speed flight?
- ANichrome
- ✓Titanium alloy
- CBronze
- DCupra-nickel
Answer
View full question & answer→Correct option: B.
Titanium alloy
MCQ 121 Mark
Which among the following lanthanoids forms most stable $+2$ oxidation state?
- A$Ce ( Z =58)$
- ✓$\operatorname{Eu}(Z=63)$
- C$Gd ( Z =64)$
- D$\operatorname{Pm}( Z =61)$
Answer
View full question & answer→Correct option: B.
$\operatorname{Eu}(Z=63)$
MCQ 131 Mark
What is the quantity of sugar charcoal remaining behind after charring $17.1 g$ sugar using conc. $H _2 SO _4$ under ideal conditions?
- A$ 14.4 g $
- ✓$10.5 g $
- C$ 7 \cdot 2 g $
- D$11.4 g $
Answer
View full question & answer→Correct option: B.
$10.5 g $
MCQ 141 Mark
Which element from following has half filled $f$ orbital in +3 oxidation state
- A$U ( Z =92)$
- ✓$Cm ( Z =96)$
- C$\operatorname{Lr}(Z=103)$
- DTh $(Z=90)$
Answer
View full question & answer→Correct option: B.
$Cm ( Z =96)$
B
MCQ 151 Mark
Identify non radioactive element from following
- ACf
- BNp
- CU
- ✓Nd
Answer
View full question & answer→Correct option: D.
Nd
D
MCQ 161 Mark
What is the number of moles of water removed from one mole of cane sugar when charred completely using conc. $H _2 SO _4$ ?
- A2
- B1
- ✓11
- D4
Answer
View full question & answer→Correct option: C.
11
C
MCQ 171 Mark
Identify the correct decreasing order of atomic size from following.
- ✓$Pr > Gd > Er > Yb$
- B$Gd > Er > Pr > Yb$
- C$Pr > Yb > Er > Gd$
- D$Yb > Er > Gd > Pr$
Answer
View full question & answer→Correct option: A.
$Pr > Gd > Er > Yb$
MCQ 181 Mark
What is the number of unpaired electrons present in $f$-orbital at +3 oxidation state of $Lu ( Z =71)$ ?
- ✓0
- B2
- C4
- D7
Answer
View full question & answer→Correct option: A.
0
A
MCQ 191 Mark
Which element from following exhibits common oxidation state +2 only?
- A$Co$
- ✓$Zn$
- C$Cu$
- D$Sc$
Answer
View full question & answer→Correct option: B.
$Zn$
B
MCQ 201 Mark
What is the position of copper in modern periodic table?
- APeriod-5, Group-9
- BPeriod-4, Group-10
- CPeriod-3, Group-9
- ✓Period-4, Group-11
Answer
View full question & answer→Correct option: D.
Period-4, Group-11
D
MCQ 211 Mark
Identify the outer electronic configuration of first element of first transition series.
- A$[ Ar ] 3 d ^1 4 s ^1$
- ✓$[ Ar ] 3 d ^1 4 s ^2$
- C$[ Kr ] 4 d ^1 5 s ^2$
- D$[ Kr ] 4 d^{\circ} 5 s^2$
Answer
View full question & answer→Correct option: B.
$[ Ar ] 3 d ^1 4 s ^2$
MCQ 221 Mark
The flux added during extraction of Iron from hematite are its?
- ASilica
- ✓Calcium carbonate
- CSodium carbonate
- DAlumina
Answer
View full question & answer→Correct option: B.
Calcium carbonate
MCQ 231 Mark
Which actinoid, other than uranium, occur in a significant amount naturally?
- ✓Thorium
- BActinium
- CProtactinium
- DPlutonium
Answer
View full question & answer→Correct option: A.
Thorium
MCQ 241 Mark
Which of the following sets of ions contain only paramagnetic ions
- A$Sm ^{3 \oplus}, Ho ^{3 \oplus}, Lu ^{3 \oplus}$
- B$La ^{3 \oplus}, Ce ^{3 \oplus}, Sm ^{3 \oplus}$
- C$La ^{3 \oplus}, Eu ^{3 \oplus}, Gd ^{3 \oplus}$
- ✓$Ce ^{3 \oplus}, Eu ^{3 \oplus}, Yb ^{3 \oplus}$
Answer
View full question & answer→Correct option: D.
$Ce ^{3 \oplus}, Eu ^{3 \oplus}, Yb ^{3 \oplus}$
MCQ 251 Mark
In which of the following series all the elements are radioactive in nature
- ALanthanoids
- ✓Actinoids
- Cd-block elements
- Ds-block elements
Answer
View full question & answer→Correct option: B.
Actinoids
MCQ 261 Mark
Magnetic moment of a metal complex is 5.9 B.M. Number of unpaired electrons in the complex is
- A2
- B3
- C4
- ✓5
Answer
View full question & answer→Correct option: D.
5
5
MCQ 271 Mark
Which of the following have $d ^0 s ^0$ configuration?
- A$Sc ^{3 \oplus}$
- B$Ti ^{4 \oplus}$
- C$V ^{5 \oplus}$
- ✓all of the above
Answer
View full question & answer→Correct option: D.
all of the above
MCQ 281 Mark
Electronic configuration of $Cu$ and $Cu ^{+1}$
- A$3 d^{10}, 4 s^0 ; 3 d^9, 4 s^0$
- B$3 d^9, 4 s^1 ; 3 d^9 4 s^0$
- ✓$3 d^{10}, 4 s^1 ; 3 d^{10}, 4 s^0$
- D$3 d^8, 4 s^1 ; 3 d^{10}, 4 s^0$
Answer
View full question & answer→Correct option: C.
$3 d^{10}, 4 s^1 ; 3 d^{10}, 4 s^0$
MCQ 291 Mark
Stable oxidation states for chromium are
- A+2, +3
- B+3, +4
- C+4, +5
- ✓+3, +6
Answer
View full question & answer→Correct option: D.
+3, +6
+3, +6
MCQ 301 Mark
Most stable oxidation state of Ruthenium is
- A2
- ✓4
- C8
- D6
Answer
View full question & answer→Correct option: B.
4
4
MCQ 311 Mark
Components of Nichrome alloy are
- ANi, Cr, Fe
- BNi, Cr, Fe, C
- ✓Ni, Cr
- DCu, Fe
Answer
View full question & answer→Correct option: C.
Ni, Cr
Ni, Cr
MCQ 321 Mark
The most stable oxidation state of Titanium is
- A2
- B3
- ✓4
- D5
Answer
View full question & answer→Correct option: C.
4
4
MCQ 331 Mark
Which one of the following is diamagnetic
- A$Cr ^{3 \oplus}$
- B$Fe ^{3 \oplus}$
- C$Cu ^{2 \oplus}$
- ✓$Sc ^{3 \oplus}$
Answer
View full question & answer→Correct option: D.
$Sc ^{3 \oplus}$
MCQ 341 Mark
What is the stock notation of Manganese dioxide?
- A
- B
- C
- ✓
MCQ 351 Mark
Which from following statements regarding transition elements is not correct?
- AThese exhibit properties between ' $s$ ' and ' $p$ ' block elements.
- BThese form cations with incomplete $d$-subshell.
- ✓$5 d$ series consists of all elements from lanthanum to mercury of periodic table.
- D
Answer
View full question & answer→Correct option: C.
$5 d$ series consists of all elements from lanthanum to mercury of periodic table.
(c) : $5 d$ series consists of all elements from lanthanum (La) to mercury $( Hg )$ except the elements of lanthanide series (Ce to Lu).
MCQ 361 Mark
Find the value of spin only magnetic moment for chromium cation in +2 state.
- A$3.87 BM$
- B$4.90 BM$
- C$2.84 BM$
- D$1.73 BM$
MCQ 371 Mark
What are different possible oxidation states exhibited by scandium?
- A
- B
- C$+4,+5$
- ✓$+2,+3$
Answer
View full question & answer→Correct option: D.
$+2,+3$
(d) : Scandium has electronic configuration of $3 d^1 4 s^2$, thus the possible oxidation states are +2 and +3 .
MCQ 381 Mark
Identify the element having highest ionization enthalpy.
- A$Ti$
- B$Sc$
- ✓$Zn$
- D$Ni$
Answer
View full question & answer→Correct option: C.
$Zn$
(c): Zinc has completely filled orbitals ( $[ Ar ] 3 d^{10} 4 s^2$ ). Hence, among the given elements, $Zn$ has highest ionization enthalpy.
MCQ 391 Mark
Which among the following cations produces colourless aqueous solution in their respective oxidation state?
- A
- B
- ✓
- D
Answer
View full question & answer→Correct option: C.
MCQ 401 Mark
What is the number of unpaired electrons present in $f$-orbital at +3 oxidation state of $\mathrm{Lu}(Z=71)$ ?
- A7
- B2
- C4
- ✓
Answer
View full question & answer→Correct option: D.
(d) : ${ }_{71} Lu :[ Xe ] 4 f^{14} 5 d^1 6 s^2 ; Lu ^{3+}:[ Xe ] 4 f^{44}$
Hence, number of unpaired electrons in $f$-orbital of $Lu ^{3+}$ is zero.
Hence, number of unpaired electrons in $f$-orbital of $Lu ^{3+}$ is zero.
MCQ 411 Mark
Which among the following lanthanoids forms most stable $+ 2$ oxidation state?
- A
- B
- C
- D
MCQ 421 Mark
Lanthande contraction is due to increase in
- ✓
- B
- C
- D
Answer
View full question & answer→Correct option: A.
(a): As we move through the lanthanide series, $4f$ electrons are progressively filled. The mutual shielding effect of electrons is very little, being even smaller than that of $d$-electrons. The nuclear charge however increases by one at each step increasing the inward pull experienced by the $4 f$ electrons and this tends to decrease in size.
MCQ 431 Mark
Which one of the following statements concerning lanthanides is false?
- AMost characteristic oxidation state of lanthanides is +3 .
- ✓The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.
- CAll lanthanides are dense metals.
- DLanthanides are separated from one another by ion exchange methods.
Answer
View full question & answer→Correct option: B.
The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.
(b) : The statement (b) is wrong as the ionic radii of trivalent ions of lanthanides decrease gradually as atomic number increases. This is also known as lanthanide contraction.
MCQ 441 Mark
The ion changes of manganate and permanganate ion are respectively
- A$-2,-2$
- B$-1,-2$
- ✓$-2,-1$
- D$-1,-1$
Answer
View full question & answer→Correct option: C.
$-2,-1$
(c) :
MCQ 451 Mark
When a mixture of manganese dioxide, potassium hydroxide and potassium chlorate is fused, the product obtained are
- A
- B
- C
- D$KMnO _4$
Answer
View full question & answer→
MCQ 461 Mark
The most basic hydroxide from the following is
- A
- B
- C
- ✓
Answer
View full question & answer→Correct option: D.
(d): The basic nature of hydroxides decreases from La to L.u along the lanthanide series due to lanthanide contraction. Thus, $La ( OH )_3$ is the most basic hydroxide.
MCQ 471 Mark
Identify the oxidation states of titanium $(Z=22)$ and copper $(Z=29)$ in their colourless compounds.
- A
- B$Ti ^{2+}, Cu ^{2+}$
- ✓
- D
Answer
View full question & answer→Correct option: C.
(c) : $Ti (22):[ Ar ] 3 d^2 4 s^2 \Rightarrow Ti ^{4+}:[ Ar ] 3 d^0 4 s^0$
$
Cu (29):[ Ar ] 3 d^9 4 s^2 \Rightarrow Cu ^{+}:[ Ar ] 3 d^{10} 4 s^0
$
$
Cu (29):[ Ar ] 3 d^9 4 s^2 \Rightarrow Cu ^{+}:[ Ar ] 3 d^{10} 4 s^0
$
MCQ 481 Mark
Identify the element that forms amphoteric oxide.
- ACarbon
- ✓Zinc
- CCalcium
- DSulphur
Answer
View full question & answer→Correct option: B.
Zinc
Zinc oxide is amphoteric in nature, it reacts with both acid and base.
$\ce{ZnO +2HCl \rightarrow ZnCl_2 + H_2O}$
$\ce{ZnO +2NaOH \rightarrow Na_2 ZnO_2 + H_2O}$
$\ce{ZnO +2HCl \rightarrow ZnCl_2 + H_2O}$
$\ce{ZnO +2NaOH \rightarrow Na_2 ZnO_2 + H_2O}$
MCQ 491 Mark
The colour and magnetic nature of manganate ion $(MnO _4{ }^2-)$ is
- ✓
- Bpurple,diamagnetic
- C
- D
Answer
View full question & answer→Correct option: A.
(a) : Manganate ion, $MnO _4^{2-}$ is green in colour and is paramagnetic in nature.
MCQ 501 Mark
Which of the following is Baeyer's reagent?
- ✓
- Bacidic $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
- Calkaline $\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$
- D$\mathrm{MnO}_2$
Answer
View full question & answer→Correct option: A.
(a): Baeyer's reagent is alkaline solution of cold potassium permanganate $\left( KMnO _4\right)$.
MCQ 511 Mark
Which of the following statements is incorrect for pair of elements $Zr - Hf$ ?
- A
- B
- C
- ✓
Answer
View full question & answer→Correct option: D.
(d) : $Zr$ and $Hf$ belong to same group. Both have identical atomic and ionic radii due to lanthanoid contraction. $Zr$ is present in 5 th period whereas $Hf$ is present in 6 th period.
MCQ 521 Mark
Idenify the metal that forms colurless compounds.
- A
- BChromium $\{Z=24\}$
- CVanadium $(Z=13)$
- ✓Scandiam $(Z=21)$
Answer
View full question & answer→Correct option: D.
Scandiam $(Z=21)$
(d) : Scandium compounds are colourless,
$Sc ^{3+}$ has zero $d$-electrons.
$Sc (21):[ Ar ] 3 d^1 4 s^2$
$Sc ^{3+}:[ Ar ] 3 d^0 4 s^{\circ}$
$Sc ^{3+}$ has zero $d$-electrons.
$Sc (21):[ Ar ] 3 d^1 4 s^2$
$Sc ^{3+}:[ Ar ] 3 d^0 4 s^{\circ}$
MCQ 531 Mark
What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?
- A
- B$\mathrm{LnS}_3$
- C
- ✓$\operatorname{Ln}_2 \mathrm{~S}_3$
Answer
View full question & answer→Correct option: D.
$\operatorname{Ln}_2 \mathrm{~S}_3$
(d) : $Ln \xrightarrow{\text { heated with } S } Ln _2 S _3$
MCQ 541 Mark
Identify a 'Chemical Twin' among the following:
- A
- B
- C
- ✓
Answer
View full question & answer→Correct option: D.
(d): $Nb$ belonging to second transition series and $Ta$ belonging to third transition series have almost similar chemical properties due to lanthanoid contraction. Hence they are called chemical twins.
MCQ 551 Mark
The only radiactive element among the lanthanoids is
- Agadolinium
- Bholmium
- ✓
- D
MCQ 561 Mark
Potassium dichromate is a good oxidizing agent, in acidic medium the oxidation state of chromium changes by
- A2
- ✓3
- C4
- D5
Answer
View full question & answer→Correct option: B.
3
MCQ 571 Mark
Select the coloured compound amongst the following :
(Atomic no. $\mathrm{Ti}=22, \mathrm{Cr}=24, \mathrm{Cu}=29, \mathrm{Zn}=30$ )
- A
- ✓$\mathrm{CrCl}_3$
- C$\mathrm{ZnCl}_2$
- D$\mathrm{CuCl}$
Answer
View full question & answer→Correct option: B.
$\mathrm{CrCl}_3$
(b):
| Compound | Central metal ion | Electronic Configuration | No.of unpaired electron |
| $\mathrm{TiCl}_4$ | ${ }_{22} \mathrm{Ti}^{4+}$ | $[\mathrm{Ar}] 3 d^0$ | 0 |
| $\mathrm{CrCl}_3$ | ${ }_{24} \mathrm{Cr}^{3+}$ | $[\mathrm{Ar}] 3 d^3$ | 3(Coloured compound) |
| $\mathrm{ZnCl}_2$ | ${ }_{30} \mathrm{Zn}^{2+}$ | $[\mathrm{Ar}] 3 d^{10}$ | 0 |
| $\mathrm{CuCl}$ | ${ }_{29} \mathrm{Cu}^{+}$ | $[\mathrm{Ar}] 3 d^{10}$ | 0 |
MCQ 581 Mark
The transuranic elements are prepared by
- Aaddition reaction
- Bsubstitution reactions
- Cdecomposition reaction
- ✓nuclear reactions
Answer
View full question & answer→Correct option: D.
nuclear reactions
nuclear reactions
MCQ 591 Mark
In the periodic table, Gadolinium belongs to
- A4th Group 6th period
- B4th group 4th period
- C3rd group 5th period
- ✓3rd group 7th period.
Answer
View full question & answer→Correct option: D.
3rd group 7th period.
3rd group 7th period.
MCQ 601 Mark
Actinoids form coloured salts due to the transition of electrons in
- A$d-d$
- ✓$f-f$
- C$f-d$
- D$s-f$
Answer
View full question & answer→Correct option: B.
$f-f$
$f-f$
MCQ 611 Mark
f-block elements are called ………………….
- Atransition elements
- Brepresentative elements
- ✓inner transition elements
- Dalkalin earth metals
Answer
View full question & answer→Correct option: C.
inner transition elements
inner transition elements
MCQ 621 Mark
The general electronic configuration of Lanthanoids is
- ✓$[ Xe ] 4 f^{1-14} 5 d^{0-1} 6 s^2$
- B$[ Xe ] 4 f^2-145 d^{0-1} 6 s^2$
- C$[ Xe ] 4 f^{1-13} 5 d^{0-1} 6 s^2$
- D$[ Xe ] 4 f^{0-14} 5 d^{0-1} 6 s^1$
Answer
View full question & answer→Correct option: A.
$[ Xe ] 4 f^{1-14} 5 d^{0-1} 6 s^2$
$[ Xe ] 4 f^{1-14} 5 d^{0-1} 6 s^2$
MCQ 631 Mark
The total number of elements in each of f-series is
- A10
- B12
- ✓14
- D15
Answer
View full question & answer→Correct option: C.
14
14
MCQ 641 Mark
Which one of the following elements belong to the actinoid series?
- ACerium
- BLutetium
- ✓Thorium
- DLanthanum
Answer
View full question & answer→Correct option: C.
Thorium
Thorium
MCQ 651 Mark
The most common oxidation state of lanthanoids is
- A$+4$
- ✓$+3$
- C$+6$
- D$+2$
Answer
View full question & answer→Correct option: B.
$+3$
$+3$
MCQ 661 Mark
Highest magnetic moment is shown by the ion
- A$V^{3+}$
- B$Co ^{3+}$
- ✓$Fe ^{3+}$
- D$Cr ^{3+}$
Answer
View full question & answer→Correct option: C.
$Fe ^{3+}$
$Fe ^{3+}$
MCQ 671 Mark
Transition elements are good catalysts since
- ✓they show variable oxidation states
- Bthey have partially filled d-orbitals
- Cthey have low I.P
- Dthey have small atomic radii
Answer
View full question & answer→Correct option: A.
they show variable oxidation states
they show variable oxidation states
MCQ 681 Mark
The highest oxidation state is shown by
- AFe
- BMn
- ✓Os
- DCr
Answer
View full question & answer→Correct option: C.
Os
Os
MCQ 691 Mark
A pair of coloured ion is
- A$Cu ^{2+}, Zn ^{2+}$
- B$Cr ^{3+}, Cu ^{+}$
- C$Cd ^{2+}, Mn ^{5+}$
- ✓$Fe ^{2+}, Fe ^{3+}$
Answer
View full question & answer→Correct option: D.
$Fe ^{2+}, Fe ^{3+}$
$Fe ^{2+}, Fe ^{3+}$
MCQ 701 Mark
The metal ion which is NOT coloured, is
- A$Fe ^{3+}$
- B$V ^{2+}$
- ✓$Zn ^{2+}$
- D$Ti ^{3+}$
Answer
View full question & answer→Correct option: C.
$Zn ^{2+}$
$Zn ^{2+}$
MCQ 711 Mark
Which one of the following compounds is expected to be coloured?
- A$AgNO _3$
- ✓$CuSO _4$
- C$ZnCl _2$
- D$CuCl$
Answer
View full question & answer→Correct option: B.
$CuSO _4$
$CuSO _4$
MCQ 721 Mark
The colour of transition metal ions is due to
- A$s \rightarrow s$ transition
- ✓$d \rightarrow d$ transition
- C$p \rightarrow p$ transition
- D$f \rightarrow f$ transition
Answer
View full question & answer→Correct option: B.
$d \rightarrow d$ transition
$d \rightarrow d$ transition
MCQ 731 Mark
Which one of the following transition elements shows the highest oxidation state?
- ASc
- B$Ti$
- ✓$Mn$
- D$Zn$
Answer
View full question & answer→Correct option: C.
$Mn$
$Mn$
MCQ 741 Mark
In $KMnO _4$, oxidation number of $Mn$ is
- A$2+$
- B$4+$
- C$6+$
- ✓$7+$
Answer
View full question & answer→Correct option: D.
$7+$
$7+$
MCQ 751 Mark
Which one of the following elements does not exhibit variable oxidation states?
- AIron
- BCopper
- ✓Zinc
- DManganese
Answer
View full question & answer→Correct option: C.
Zinc
Zinc
MCQ 761 Mark
Fe belongs to the
- ✓3d-transition series elements
- B4d-transition series elements
- C5d-transition series elements
- D$6 d$-transition series elements
Answer
View full question & answer→Correct option: A.
3d-transition series elements
3d-transition series elements
MCQ 771 Mark
The observed electronic configuration of copper is
- A$[ Ar ]^{18} 3 d^9 4 s^2$
- B$[ Kr ] 3 d ^{10} 45^1$
- C$[ Kr ] 3 d ^9 4 s ^2$
- ✓$[ Ar ] 3 d ^{10} 45^1$
Answer
View full question & answer→Correct option: D.
$[ Ar ] 3 d ^{10} 45^1$
$[ Ar ] 3 d ^{10} 45^1$
MCQ 781 Mark
The electronic configuration of Sc is
- A$[ Ar ] 3 d ^2 4 s ^2$
- ✓$[ Ar ] 3 d^1 4 s^2$
- C$[K r] 3 d^1 4 s^2$
- D$[K r] 3 d^2 4 s^1$
Answer
View full question & answer→Correct option: B.
$[ Ar ] 3 d^1 4 s^2$
$[ Ar ] 3 d^1 4 s^2$
MCQ 791 Mark
The incomplete d-series is
- A3d
- B4d
- C5d
- ✓6d
Answer
View full question & answer→Correct option: D.
6d
6d
MCQ 801 Mark
Which one of the following elements does NOT belong to first transition series?
- AFe
- BV
- ✓Ag
- DCu
Answer
View full question & answer→Correct option: C.
Ag
Ag
MCQ 811 Mark
The last electron of transition element is called
- As-electron
- Bp-electron
- ✓d-electron
- Df-electron
Answer
View full question & answer→Correct option: C.
d-electron
d-electron
MCQ 821 Mark
The group which belongs to transition series is
- A2
- ✓7
- C13
- D15
Answer
View full question & answer→Correct option: B.
7
7
MCQ 831 Mark
Manganese achieves the highest oxidation state in its compounds
- A$Mn _3 O _4$
- ✓$KMnO _4$
- C$K _2 MnO _4$
- D$MnO _2$
Answer
View full question & answer→Correct option: B.
$KMnO _4$
$KMnO _4$
MCQ 841 Mark
Chromium (Z = 24) has electronic configuration
- A$[ Ar ] 4 d^A 4 s^2$
- B$[ Ar ] 4 d ^5 45^1$
- C$[A r] 3 d^5 3 s^1$
- ✓$[ Ar ] 3 d^5 4 s^1$
Answer
View full question & answer→Correct option: D.
$[ Ar ] 3 d^5 4 s^1$
$[ Ar ] 3 d^5 4 s^1$
MCQ 851 Mark
In transition elements, the different electron enters into
- Ans subshell
- Bnp subshell
- ✓(n – 1) d subshell
- D(n – 2)f subshell
Answer
View full question & answer→Correct option: C.
(n – 1) d subshell
(n – 1) d subshell