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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 5851. |
The decrease in atomic volume from \[Cr\] to \[Cu\] is very negligible because |
| A. | Increase in nuclear change |
| B. | Screening effect |
| C. | Unpaired electrons of \[Cr\] |
| D. | None |
| Answer» C. Unpaired electrons of \[Cr\] | |
| 5852. |
Which of the following is the weakest reducing agent |
| A. | \[Zn\] |
| B. | \[Cu\] |
| C. | \[{{H}_{2}}\] |
| D. | \[Li\] |
| Answer» C. \[{{H}_{2}}\] | |
| 5853. |
The placement of \[Zn,\] \[Cd\] and \[Hg\] along with \['d'\] block elements is not proper because |
| A. | Their \['d'\] orbitals are completely filled |
| B. | Their \['d'\] orbitals are empty |
| C. | They do not form complex compounds |
| D. | They do not form coloured compounds |
| Answer» B. Their \['d'\] orbitals are empty | |
| 5854. |
Which element belongs to d - block [CPMT 1984] |
| A. | \[Na\] |
| B. | \[Ca\] |
| C. | \[Cu\] |
| D. | \[Ar\] |
| Answer» D. \[Ar\] | |
| 5855. |
Hydrated \[C{{u}^{+2}}\] ion will be |
| A. | Green |
| B. | Violet |
| C. | Blue |
| D. | Colourless |
| Answer» D. Colourless | |
| 5856. |
Which of the following will have standard oxidation potential less than \[SHE\] |
| A. | \[Zn\] |
| B. | \[Cu\] |
| C. | \[Fe\] |
| D. | \[Ni\] |
| Answer» C. \[Fe\] | |
| 5857. |
The property exhibited by only transitional elements |
| A. | To form paramagnetic compounds |
| B. | To form coloured compounds |
| C. | To form complex compounds |
| D. | To show inert tendency |
| Answer» D. To show inert tendency | |
| 5858. |
All those elements belong to f - block whose atomic numbers are |
| A. | 58 to 71 |
| B. | 90 to 103 |
| C. | Both a and b |
| D. | None |
| Answer» D. None | |
| 5859. |
Rare-earth elements are exhibited by |
| A. | At. No. 58 to 71 |
| B. | At. No. 21 to 30 |
| C. | At. No. 39 to 71 |
| D. | At. No. 81 to 91 |
| Answer» B. At. No. 21 to 30 | |
| 5860. |
\[3{{d}^{10}}4{{s}^{0}}\] electronic configuration exhibits |
| A. | \[Z{{n}^{++}}\] |
| B. | \[C{{u}^{++}}\] |
| C. | \[C{{d}^{++}}\] |
| D. | \[H{{g}^{++}}\] |
| Answer» B. \[C{{u}^{++}}\] | |
| 5861. |
Which occurs in nature in free state |
| A. | \[Fe\] |
| B. | \[Co\] |
| C. | \[Ni\] |
| D. | \[Pt\] |
| Answer» E. | |
| 5862. |
Which forms coloured salts [CPMT 1984; MP PET 1995] |
| A. | Metals |
| B. | Non-metals |
| C. | p - block elements |
| D. | Transitional elements |
| Answer» E. | |
| 5863. |
Which forms interstitial compounds [BHU 1982; MP PMT 1983] |
| A. | \[Fe\] |
| B. | \[Co\] |
| C. | \[Ni\] |
| D. | All of these |
| Answer» E. | |
| 5864. |
Which has the maximum ferromagnetic character |
| A. | \[Fe\] |
| B. | \[Co\] |
| C. | \[Ni\] |
| D. | \[Pt\] |
| Answer» B. \[Co\] | |
| 5865. |
Least reactive metal is |
| A. | \[Fe\] |
| B. | \[Os\] |
| C. | \[Ni\] |
| D. | \[Pt\] |
| Answer» E. | |
| 5866. |
Which is most reactive metal [BHU 1979] |
| A. | \[Fe\] |
| B. | \[Pt\] |
| C. | \[Ni\] |
| D. | \[Co\] |
| Answer» B. \[Pt\] | |
| 5867. |
Lanthanide contraction occurs because [AMU 2000; BHU 2003] |
| A. | f-orbital electrons are easily lost |
| B. | f-orbital an incompletely filled |
| C. | f-orbital electron an poor shielders of nuclear charge |
| D. | f-orbital do not come out on the surface of atom and are buried inside |
| Answer» E. | |
| 5868. |
The 3d-metal ions are paramagnetic in nature because [MP PMT 1997] |
| A. | They are reducing agents |
| B. | They form coloured salts |
| C. | They have one or more paired s-electrons |
| D. | They have one or more unpaired d-electrons |
| Answer» E. | |
| 5869. |
The tendency of 3d-metal ions to form stable complexes is due to their [MP PMT 1997] |
| A. | Variable oxidation state |
| B. | Strong electronegative nature |
| C. | High charge/size ratio and vacant d-orbitals |
| D. | Very low ionization energies |
| Answer» D. Very low ionization energies | |
| 5870. |
On the basis of position in the electrochemical series, the metal which does not displace hydrogen from water and acid is |
| A. | \[Hg\] |
| B. | \[Al\] |
| C. | \[Pb\] |
| D. | \[Ba\] |
| Answer» B. \[Al\] | |
| 5871. |
Which of the following melts in boiling water [MNR 1984] |
| A. | Gun metal |
| B. | Wood's metal |
| C. | Monel metal |
| D. | Bell metal |
| E. | None of these |
| Answer» C. Monel metal | |
| 5872. |
The tendency towards complex formation is maximum in |
| A. | s - block elements |
| B. | p - block elements |
| C. | d - block elements |
| D. | f - block elements |
| Answer» D. f - block elements | |
| 5873. |
All the following statements about the transitional elements are true except that [Kerala (Med.) 2003] |
| A. | All of the transitional elements are predominantly metallic |
| B. | In aqueous solution many of their simple ions are coloured |
| C. | Most of the transitional elements show pronounced catalytic activity |
| D. | Most of the transitional elements show only one valence state |
| Answer» E. | |
| 5874. |
Which has valency two |
| A. | \[Al\] |
| B. | \[Rb\] |
| C. | \[Cu\] |
| D. | \[Ge\] |
| Answer» D. \[Ge\] | |
| 5875. |
The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration [MP PET 1993; MP PMT 1995; RPMT 1999] |
| A. | \[3{{d}^{2}}\] |
| B. | \[3{{d}^{5}}\] |
| C. | \[3{{d}^{7}}\] |
| D. | \[3{{d}^{9}}\] |
| Answer» C. \[3{{d}^{7}}\] | |
| 5876. |
The electronic configuration (outermost) of \[M{{n}^{+2}}\] ion (atomic no. of \[Mn=25\]) in its ground state is [MP PET 1993; MP PMT 1994; AFMC 2002] |
| A. | \[3{{d}^{5}}4{{s}^{0}}\] |
| B. | \[3{{d}^{4}}4{{s}^{1}}\] |
| C. | \[3{{d}^{3}}4{{s}^{2}}\] |
| D. | \[3{{d}^{2}}4{{s}^{2}}4{{p}^{2}}\] |
| Answer» B. \[3{{d}^{4}}4{{s}^{1}}\] | |
| 5877. |
The first transition element is |
| A. | Chromium |
| B. | Scandium |
| C. | Nickel |
| D. | Copper |
| Answer» C. Nickel | |
| 5878. |
Lanthanide for which + II and + III oxidation states are common is [AIIMS 2003] |
| A. | La |
| B. | Nd |
| C. | Ce |
| D. | Eu |
| Answer» B. Nd | |
| 5879. |
The number of unpaired electrons in \[Z{{n}^{++}}\] is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 0 |
| Answer» E. | |
| 5880. |
The substance used in cancer therapy is [DPMT 2002] |
| A. | Rn |
| B. | Ni |
| C. | Fe |
| D. | Co |
| Answer» E. | |
| 5881. |
Which of the following is a colourless ion [EAMCET 1992] |
| A. | \[C{{u}^{+2}}\] |
| B. | \[F{{e}^{+3}}\] |
| C. | \[T{{i}^{+3}}\] |
| D. | \[Z{{n}^{+2}}\] |
| Answer» E. | |
| 5882. |
Which of the following elements is alloyed with copper to form brass [MP PET 2003; MP PMT 2004] |
| A. | Lead |
| B. | Silver |
| C. | Zinc |
| D. | Antimony |
| Answer» D. Antimony | |
| 5883. |
Europium is [DPMT 2005] |
| A. | s-block element |
| B. | p-block element |
| C. | d-block element |
| D. | f-block element |
| Answer» E. | |
| 5884. |
The number of unpaired electrons is maximum in (Atomic no. : Ti = 22; V= 23; Cr = 24; Fe = 26) [MP PET 2003] |
| A. | Cr |
| B. | Fe |
| C. | V |
| D. | Sc |
| Answer» B. Fe | |
| 5885. |
For which of the following transition metal ion is shown highest magnetic moment having outer electronic configuration [MP PET 2003] |
| A. | \[3{{d}^{1}}\] |
| B. | \[3{{d}^{8}}\] |
| C. | \[3{{d}^{5}}\] |
| D. | \[3{{d}^{7}}\] |
| Answer» D. \[3{{d}^{7}}\] | |
| 5886. |
Which of the following transition metal is used as a catalyst [CPMT 2001] |
| A. | Nickel |
| B. | Cobalt |
| C. | Gold |
| D. | Both A and B |
| Answer» E. | |
| 5887. |
Complex ion is shown by [CPMT 2001] |
| A. | \[Ag\] |
| B. | \[Au\] |
| C. | \[Cu\] |
| D. | All of these |
| Answer» E. | |
| 5888. |
Which one of the following statements concerning lanthanides elements is false [AMU 2001] |
| A. | Lanthanides are separated from one another by ion exchange methods |
| B. | The ionic radii of trivalent lanthanides steadily increase with increase in atomic number |
| C. | All lanthanides are highly dense metals |
| D. | Most typical oxidation of lanthanides is \[+3\] |
| Answer» C. All lanthanides are highly dense metals | |
| 5889. |
Which is heaviest among the following [CPMT 1986] |
| A. | Iron |
| B. | Copper |
| C. | Gold |
| D. | Silver |
| Answer» D. Silver | |
| 5890. |
The number of unpaired electrons in \[C{{r}^{+}}\] will be |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 5891. |
The dependence of Gibbs free energy on pressure for an isothermal process of an ideal gas is given by [MP PET 1996] |
| A. | \[\Delta {{G}_{T}}=nRT\,\ln \,\frac{{{P}_{2}}}{{{P}_{1}}}\] |
| B. | \[\Delta {{G}_{T}}=nRT\,\ln \frac{{{V}_{2}}}{{{V}_{1}}}\] |
| C. | \[\Delta {{G}_{T}}=nRT\,\log \,\frac{{{P}_{1}}}{{{P}_{2}}}\] |
| D. | \[\Delta {{G}_{T}}=nRT\,\log \,\frac{{{V}_{2}}}{{{V}_{1}}}\] |
| Answer» B. \[\Delta {{G}_{T}}=nRT\,\ln \frac{{{V}_{2}}}{{{V}_{1}}}\] | |
| 5892. |
At constant pressure and temperature, the direction to the result of any chemical reaction is where, there is less amount of |
| A. | Entropy |
| B. | Enthalpy |
| C. | Gibb's free energy |
| D. | None of the above |
| Answer» D. None of the above | |
| 5893. |
The relation \[\Delta G=\Delta H-T\Delta S\] was given by [MP PMT 2000; KCET 2002] |
| A. | Boltzmann |
| B. | Faraday |
| C. | Gibbs?Helmholtz |
| D. | Thomson |
| Answer» D. Thomson | |
| 5894. |
For precipitation reaction of \[A{{g}^{+}}\] ions with \[NaCl\], which of the following statements is correct [CPMT 1988] |
| A. | \[\Delta H\] for the reaction is zero |
| B. | \[\Delta G\] for the reaction is zero |
| C. | \[\Delta G\] for the reaction is negative |
| D. | \[[\Delta G]=[\Delta H]\] |
| Answer» D. \[[\Delta G]=[\Delta H]\] | |
| 5895. |
The relation between \[\Delta G\] and \[\Delta H\] is [MP PMT 1994, 95, 97; AFMC 1997; Kurukshetra CEE 1998] |
| A. | \[\Delta H=\Delta G-T\,\Delta S\] |
| B. | \[\Delta G=\Delta H-T\,\Delta S\] |
| C. | \[T\,\Delta S-\Delta G=\Delta H\] |
| D. | \[\Delta H=T\,\Delta G+\Delta S\] |
| Answer» C. \[T\,\Delta S-\Delta G=\Delta H\] | |
| 5896. |
A minus sign of the free energy change denotes that |
| A. | The reaction tends to proceed spontaneously |
| B. | The reaction is non-spontaneous |
| C. | The system is in equilibrium |
| D. | The reaction is very much unlikely |
| Answer» B. The reaction is non-spontaneous | |
| 5897. |
The \[\Delta H\] and \[\Delta S\] for a reaction at one atmospheric pressure are +30.558 kJ and \[0.066\,kJ{{k}^{-1}}\] respectively. The temperature at which the free energy change will be zero and below of this temperature the nature of reaction would be [Kerala CET 2005] |
| A. | 483 K, spontaneous |
| B. | 443 K, non-spontaneous |
| C. | 443 K, spontaneous |
| D. | 463 K, non-spontaneous |
| E. | 463 K, spontaneous |
| Answer» E. 463 K, spontaneous | |
| 5898. |
The free energy for a reaction having \[\Delta H=31400\,ca;\]. \[\Delta S=32\,cal\,{{K}^{-1}}\,mo{{l}^{-1}}\] at \[{{1000}^{o}}C\] is [Orissa JEE 2005] |
| A. | ? 9336 cal |
| B. | ? 7386 cal |
| C. | ?1936 cal |
| D. | + 9336 cal |
| Answer» B. ? 7386 cal | |
| 5899. |
Standard enthalpy and standard entropy changes for the oxidation of ammonia at \[298\,K\] are \[-382.64\,kJ\,mo{{l}^{-1}}\] and \[-145.6\,J{{K}^{-1}}mo{{l}^{-1}}\], respectively. Standard Gibbs energy change for the same reaction at \[298\,K\] is [CBSE PMT 2004] |
| A. | ? 439.3 kJ \[mo{{l}^{-1}}\] |
| B. | ? 523.2 \[kJ\,mo{{l}^{-1}}\] |
| C. | ? 221.1 \[kJ\,mo{{l}^{-1}}\] |
| D. | ? 339.3 \[kJ\,mo{{l}^{-1}}\] |
| Answer» E. | |
| 5900. |
Gibb?s free enrgy \[(G)\] is defined as [Pb. CET 2001] |
| A. | \[\Delta G=\Delta H-T\Delta S\] |
| B. | \[\Delta G=\Delta H+\frac{T}{\Delta S}\] |
| C. | \[\Delta H=\Delta G-T\Delta S\] |
| D. | \[\Delta G=\Delta H+T.{{C}_{p}}\] |
| Answer» B. \[\Delta G=\Delta H+\frac{T}{\Delta S}\] | |