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 · Page 1 of 2
MCQ
🎯
Test yourself on this topic
50 questions · timed · auto-graded
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 $\left( KMnO _4\right)$.