MCQOPTIONS
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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.
| 6801. |
The oxide, which cannot act as a reducing agent, is [Pb. CET 2002] |
| A. | \[N{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[Cl{{O}_{2}}\] |
| Answer» D. \[Cl{{O}_{2}}\] | |
| 6802. |
Hydrogen ion concentration of an aqueous solution is \[1\times {{10}^{-4}}M\]. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of mol \[d{{m}^{-3}}\] is [KCET 2001] |
| A. | \[1\times {{10}^{-8}}\] |
| B. | \[1\times {{10}^{-6}}\] |
| C. | \[2\times {{10}^{-10}}\] |
| D. | \[0.5\times {{10}^{-10}}\] |
| Answer» D. \[0.5\times {{10}^{-10}}\] | |
| 6803. |
White P reacts with caustic soda, the products are \[P{{H}_{3}}\] and \[Na{{H}_{2}}P{{O}_{2}}\]. This reaction is an example of [DCE 2003] |
| A. | Oxidation |
| B. | Reduction |
| C. | Disproportionation |
| D. | Neutralisation |
| Answer» D. Neutralisation | |
| 6804. |
At 298K a 0.1 M \[C{{H}_{3}}COOH\]solution is 1.34% ionized. The ionization constant \[{{K}_{a}}\] for acetic acid will be [AMU 2002; AFMC 2005] |
| A. | \[1.82\times {{10}^{-5}}\] |
| B. | \[18.2\times {{10}^{-5}}\] |
| C. | \[0.182\times {{10}^{-5}}\] |
| D. | None of these |
| Answer» B. \[18.2\times {{10}^{-5}}\] | |
| 6805. |
If solubility product of \[HgS{{O}_{4}}\] is \[6.4\times {{10}^{-5}}\], then its solubility is [BHU 2004] |
| A. | \[8\times {{10}^{-3}}mole/litre\] |
| B. | \[6.4\times {{10}^{-5}}mole/litre\] |
| C. | \[6.4\times {{10}^{-3}}mole/litre\] |
| D. | \[2.8\times {{10}^{-6}}mole/litre\] |
| Answer» B. \[6.4\times {{10}^{-5}}mole/litre\] | |
| 6806. |
General configuration of outermost and penultimate shell is \[(n-1)\,{{s}^{2}}\,(n-1)\,\,{{p}^{6}}(n-1)\,\,{{d}^{x}}n{{s}^{2}}.\] If n = 4 and x = 5 then no. of proton in the nucleus will be [MP PET 2003] |
| A. | > 25 |
| B. | < 24 |
| C. | 25 |
| D. | 30 |
| Answer» D. 30 | |
| 6807. |
Lassaigne's test for the detection of nitrogen fails in [CBSE PMT 1994] |
| A. | \[N{{H}_{2}}CONHN{{H}_{2}}.HCl\] |
| B. | \[N{{H}_{2}}N{{H}_{2}}.HCl\] |
| C. | \[N{{H}_{2}}CON{{H}_{2}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}NHN{{H}_{2}}.HCl\] |
| Answer» C. \[N{{H}_{2}}CON{{H}_{2}}\] | |
| 6808. |
Which of the following is Friedel-Craft?s reaction [MP PET 1994] |
| A. | \[{{C}_{6}}{{H}_{6}}+FeC{{l}_{3}}+C{{l}_{2}}\to {{C}_{6}}{{H}_{5}}Cl\] |
| B. | \[{{C}_{6}}{{H}_{5}}CHO+C{{H}_{3}}CHO+KOH\to {{C}_{6}}{{H}_{5}}CH=CH-CHO\] |
| C. | \[{{C}_{6}}{{H}_{6}}+C{{H}_{3}}COCl+AlC{{l}_{3}}\to \overset{\,\,\,O}{\mathop{\overset{\,\,\,\,||}{\mathop{{{C}_{6}}{{H}_{5}}-C-C{{H}_{3}}}}\,}}\,\] |
| D. | \[{{C}_{6}}{{H}_{5}}OH+CHC{{l}_{3}}+KOH\xrightarrow{{}}\text{Salicylaldehyde}\] |
| Answer» D. \[{{C}_{6}}{{H}_{5}}OH+CHC{{l}_{3}}+KOH\xrightarrow{{}}\text{Salicylaldehyde}\] | |
| 6809. |
A compound possesses 8% sulphur by mass. The least molecular mass is [AIIMS 2002] |
| A. | 200 |
| B. | 400 |
| C. | 155 |
| D. | 355 |
| Answer» C. 155 | |
| 6810. |
Discovery of the nucleus of an atom was due to the experiment carried out by [CPMT 1983; MP PET 1983] |
| A. | Bohr |
| B. | Mosley |
| C. | Rutherford |
| D. | Thomson |
| Answer» D. Thomson | |
| 6811. |
Which combination is best explained by the co-ordinate covalent bond [JIPMER 2001; CBSE PMT 1990] |
| A. | \[{{H}^{+}}+{{H}_{2}}O\] |
| B. | Cl + Cl |
| C. | \[Mg+\frac{1}{2}{{O}_{2}}\] |
| D. | \[{{H}_{2}}+{{I}_{2}}\] |
| Answer» B. Cl + Cl | |
| 6812. |
Consider the following statements : For diatomic gases, the ratio \[{{C}_{p}}/{{C}_{v}}\] is equal to (1) 1.40 (lower temperature) (2) 1.66 (moderate temperature) (3) 1.29 (higher temperature) which of the above statements are correct |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 6813. |
Electrophiles are [RPET 2000] |
| A. | Lewis acids |
| B. | Lewis base |
| C. | Bronsted acid |
| D. | Bronsted base |
| Answer» B. Lewis base | |
| 6814. |
The concentration of \[[{{H}^{+}}]\] and concentration of \[[O{{H}^{-}}]\] of a 0.1 aqueous solution of 2% ionised weak acid is [Ionic product of water \[=1\times {{10}^{-14}}]\] [DPMT 2004; CBSE PMT 1999] |
| A. | \[2\times {{10}^{-3}}\]M and \[5\times {{10}^{-12}}\]M |
| B. | \[1\times {{10}^{3}}\ M\ \text{and}\ 3\times {{10}^{-11}}M\] |
| C. | \[0.02\times {{10}^{-3}}\ M\ \text{and}\ 5\times {{10}^{-11}}M\] |
| D. | \[3\times {{10}^{-2}}\ M\ \text{and}\ 4\times {{10}^{-13}}M\] |
| Answer» B. \[1\times {{10}^{3}}\ M\ \text{and}\ 3\times {{10}^{-11}}M\] | |
| 6815. |
What is the pH of 0.01 M glycine solution? For glycine, \[K{{a}_{1}}=4.5\times {{10}^{-3}}\]and \[K{{a}_{2}}=1.7\times {{10}^{-10}}\]at 298 K [AIIMS 2004] |
| A. | 3.0 |
| B. | 10.0 |
| C. | 6.1 |
| D. | 7.2 |
| Answer» D. 7.2 | |
| 6816. |
Which of the following oxides of nitrogen is paramagnetic [CPMT 1984; CBSE PMT 1994; AIIMS 2000] |
| A. | \[{{N}_{2}}{{O}_{3}}\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» D. \[{{N}_{2}}{{O}_{5}}\] | |
| 6817. |
The dissociation of water at \[{{25}^{o}}C\]is \[1.9\times {{10}^{-7}}%\] and the density of water is \[1.0\,g/c{{m}^{3}}.\] The ionisation constant of water is [IIT 1995] |
| A. | \[3.42\times {{10}^{-6}}\] |
| B. | \[3.42\times {{10}^{-8}}\] |
| C. | \[1.00\times {{10}^{-14}}\] |
| D. | \[2.00\times {{10}^{-16}}\] |
| Answer» E. | |
| 6818. |
\[{{H}_{3}}P{{O}_{2}}\] is the formula for one of the phosphorus acid. Its name and basicity are respectively [CBSE PMT 1992; BHU 1999; KCET 1999] |
| A. | Phosphorus acid and two |
| B. | Hypophosphorus acid and two |
| C. | Hypophosphorus acid and one |
| D. | Hypophosphoric acid and two |
| Answer» D. Hypophosphoric acid and two | |
| 6819. |
For a weak acid \[HA\] with dissociation constant \[{{10}^{-9}},\,\,pOH\] of its 0.1 M solution is [CBSE PMT 1989] |
| A. | 9 |
| B. | 3 |
| C. | 11 |
| D. | 10 |
| Answer» E. | |
| 6820. |
Which of the following element does not belong to the family of elements indicated [Orissa JEE 1997] |
| A. | Rubidium (Rb, Z = 37) : Alkali metals |
| B. | Barium (Ba, Z = 56) : Alkaline earth metals |
| C. | Iridium (I, Z = 77) : Nobel gases |
| D. | Argon (Ar, Z = 18) : Nobel gases |
| Answer» D. Argon (Ar, Z = 18) : Nobel gases | |
| 6821. |
The solubility product of \[A{{s}_{2}}{{S}_{3}}\] is \[2.8\times {{10}^{-72}}\]. What is the solubility of \[A{{s}_{2}}{{S}_{3}}\] [Pb. CET 2003] |
| A. | \[1.09\times {{10}^{-15}}\ mole/litre\] |
| B. | \[1.72\times {{10}^{-15}}\ mole/litre\] |
| C. | \[2.3\times {{10}^{-16}}\ mole/litre\] |
| D. | \[1.65\times {{10}^{-36}}\ mole/litre\] |
| Answer» B. \[1.72\times {{10}^{-15}}\ mole/litre\] | |
| 6822. |
The following acids have been arranged in the order of decreasing acid strength. Identify the correct order. (I) \[ClOH\] (II) \[BrOH\] (III) \[IOH\] [IIT 1996] |
| A. | \[I>II>III\] |
| B. | \[II>I>III\] |
| C. | \[III>II>I\] |
| D. | \[I>III>II\] |
| Answer» B. \[II>I>III\] | |
| 6823. |
A weak acid is 0.1% ionised in 0.1 M solution. Its pH is [BVP 2004] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» D. 1 | |
| 6824. |
Nitrolim is [CPMT 1976, 78, 2000; BHU 1987; DCE 1999; RPMT 2000] |
| A. | \[Ca{{(N{{O}_{3}})}_{2}}\] |
| B. | \[Ca{{(CN)}_{2}}\] |
| C. | \[CaC{{N}_{2}}+C\] |
| D. | \[CaC{{N}_{2}}\] |
| Answer» D. \[CaC{{N}_{2}}\] | |
| 6825. |
The pH of a solution at \[25{}^\circ C\] containing \[0.10\,m\] sodium acetate and \[0.03\,m\] acetic acid is \[(p{{K}_{a}}\]for \[C{{H}_{3}}COOH=4.57)\] [AIIMS 2002; BHU 2002] |
| A. | 4.09 |
| B. | 5.09 |
| C. | 6.10 |
| D. | 7.09 |
| Answer» C. 6.10 | |
| 6826. |
The pH of a soft drink is 3.82. Its hydrogen ion concentration will be [MP PET 1990] |
| A. | \[1.96\times {{10}^{-2}}\,\,mol/l\] |
| B. | \[1.96\times {{10}^{-3}}\,\,mol/l\] |
| C. | \[1.5\times {{10}^{-4}}\,\,mol/l\] |
| D. | \[1.96\times {{10}^{-1}}\,\,mol/l\] |
| Answer» D. \[1.96\times {{10}^{-1}}\,\,mol/l\] | |
| 6827. |
The values of \[{{K}_{sp}}\]for \[CuS,\,\,A{{g}_{2}}S\] and \[HgS\] are \[{{10}^{-31}},\,{{10}^{42}}\] and \[{{10}^{-54}}\] respectively. The correct order of their solubility in water is [MP PMT 2003] |
| A. | \[A{{g}_{2}}S>HgS>CuS\] |
| B. | \[HgS>CuS>A{{g}_{2}}S\] |
| C. | \[HgS>A{{g}_{2}}S>CuS\] |
| D. | \[A{{g}_{2}}S>CuS>HgS\] |
| Answer» E. | |
| 6828. |
At \[{{30}^{o}}C,\] the solubility of \[A{{g}_{2}}C{{O}_{3}}\,({{K}_{sp}}=8\times {{10}^{-12}})\] would be greatest in one litre of [MP PMT 1990] |
| A. | \[0.05\,M\,N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[0.05\,M\,AgN{{O}_{3}}\] |
| C. | Pure water |
| D. | \[0.05\,M\,N{{H}_{3}}\] |
| Answer» D. \[0.05\,M\,N{{H}_{3}}\] | |
| 6829. |
The atomic radii of alkali metals (M) lie in the order \[LiR{{b}^{+}}\]. What is the reason for this reverse order (on going from \[Li\] to\[Rb)\]? [MP PMT 1997] |
| A. | Gradual increase in ionisation energy |
| B. | Increasing weakness of the metallic bond |
| C. | Increasing electropositive character |
| D. | Decreasing degree of hydration |
| Answer» E. | |
| 6830. |
Which of the following is not the correct increasing order of ionisation energy [RPMT 2000] |
| A. | \[C{{l}^{-}}<Ar<{{K}^{+}}\] |
| B. | \[Au<Ag<Cu\] |
| C. | \[Cs<Rb<K\] |
| D. | \[K<Ca<Sc\] |
| Answer» C. \[Cs<Rb<K\] | |
| 6831. |
0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon in hydrocarbon is |
| A. | 75.8 |
| B. | 80 |
| C. | 56.6 |
| D. | 28.6 |
| Answer» C. 56.6 | |
| 6832. |
Among the following compounds which can be dehydrated very easily is [AIEEE 2004] |
| A. | \[C{{H}_{3}}-C{{H}_{2}}-\underset{OH\ \ \ \ \ \ }{\overset{C{{H}_{3}}\ \ \ \ }{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-C{{H}_{2}}}}}\,-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-OH\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-\underset{C{{H}_{3}}\ }{\mathop{\underset{|}{\mathop{C}}\,H-}}\,C{{H}_{2}}-C{{H}_{2}}-OH\] |
| Answer» B. \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\] | |
| 6833. |
\[C{{H}_{3}}C\equiv CC{{H}_{3}}\underset{(ii){{H}_{2}}O/Zn}{\mathop{\xrightarrow{(i)\text{ }X}}}\,\underset{\,O\,\,\,\,\,\,O\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,|}{\mathop{C{{H}_{3}}-C-C-C{{H}_{3}}}}\,}}\,\] X in the above reaction is [CPMT 1985; MP PET 1997; Roorkee Qualifying 1998; DPMT 2001] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{O}_{3}}\] |
| D. | \[KMn{{O}_{4}}\] |
| Answer» D. \[KMn{{O}_{4}}\] | |
| 6834. |
The ratio of the energy of a photon of \[2000{AA}\] wavelength radiation to that of \[4000{AA}\] radiation is [IIT 1986; DCE 2000; JIPMER 2000] |
| A. | 1/4 |
| B. | 4 |
| C. | 44228 |
| D. | 2 |
| Answer» E. | |
| 6835. |
\[2S{{O}_{3}}\]⇌\[2S{{O}_{2}}+{{O}_{2}}\]. If \[{{K}_{c}}=100,\,\,\alpha =1\], half of the reaction is completed, the concentration of \[S{{O}_{3}}\] and \[S{{O}_{2}}\] are equal, the concentration of \[{{O}_{2}}\] is [CPMT 1996] |
| A. | \[0.001\,M\] |
| B. | \[\frac{1}{2}\,S{{O}_{2}}\] |
| C. | 2 times of \[S{{O}_{2}}\] |
| D. | Data incomplete |
| Answer» E. | |
| 6836. |
The molar solubility \[(mol\ {{L}^{-1}})\] of a sparingly soluble salt \[M{{X}_{4}}\] is \['s'\]. The corresponding solubility product is \[{{K}_{sp}}\]. \['s'\]is given in terms of \[_{{{K}_{sp}}}\]by the relation [AIEEE 2004] |
| A. | \[s={{(256{{K}_{sp}})}^{1/5}}\] |
| B. | \[s={{(128{{K}_{sp}})}^{1/4}}\] |
| C. | \[s={{({{K}_{sp}}/128)}^{1/4}}\] |
| D. | \[s={{({{K}_{sp}}/256)}^{1/5}}\] |
| Answer» E. | |
| 6837. |
For \[{{H}_{3}}P{{O}_{3}}\] and \[{{H}_{3}}P{{O}_{4}}\] the correct choice is [IIT Screening 2003] |
| A. | \[{{H}_{3}}P{{O}_{3}}\] is dibasic and reducing |
| B. | \[{{H}_{3}}P{{O}_{3}}\] is dibasic and non-reducing |
| C. | \[{{H}_{3}}P{{O}_{4}}\] is tribasic and reducing |
| D. | \[{{H}_{3}}P{{O}_{3}}\] is tribasic and non-reducing |
| Answer» B. \[{{H}_{3}}P{{O}_{3}}\] is dibasic and non-reducing | |
| 6838. |
How many structural isomers are possible for a compound with molecular formula \[{{C}_{3}}{{H}_{7}}Cl\] [CBSE PMT 2001] |
| A. | 2 |
| B. | 5 |
| C. | 7 |
| D. | 9 |
| Answer» B. 5 | |
| 6839. |
\[p{{K}_{a}}\] value for acetic acid at the experimental temperature is 5. The percentage hydrolysis of \[0.1\,\,M\] sodium acetate solution will be |
| A. | \[1\times {{10}^{-4}}\] |
| B. | \[1\times {{10}^{-2}}\] |
| C. | \[1\times {{10}^{-3}}\] |
| D. | \[1\times {{10}^{-3}}\] |
| Answer» C. \[1\times {{10}^{-3}}\] | |
| 6840. |
Cyclic hydrocarbon molecule ?A? has all the carbon and hydrogen in a single plane. All the carbon-carbon bonds are of same length less than 1.54Å, but more than 1.34Å. The \[C-C\] bond angle will be [BVP 2003] |
| A. | \[{{109}^{o}}2{8}'\] |
| B. | \[{{100}^{o}}\] |
| C. | \[{{180}^{o}}\] |
| D. | \[{{120}^{o}}\] |
| Answer» E. | |
| 6841. |
The solubility product of a binary weak electrolyte is \[4\times {{10}^{-10}}\] at \[298\,K\]. Its solubility in mol \[d{{m}^{-3}}\] at the same temperature is [KCET 2001] |
| A. | \[4\times {{10}^{-5}}\] |
| B. | \[2\times {{10}^{-5}}\] |
| C. | \[8\times {{10}^{-10}}\] |
| D. | \[16\times {{10}^{-20}}\] |
| Answer» C. \[8\times {{10}^{-10}}\] | |
| 6842. |
The reaction of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] with iodine gives [CPMT 1971, 80, 81; DPMT 1983, 90; MP PMT 1985; EAMCET 1990; BHU 1980] |
| A. | Sodium sulphide |
| B. | Sodium sulphite |
| C. | Sodium sulphate |
| D. | Sodium tetrathionate |
| Answer» E. | |
| 6843. |
Calculate the solubility of \[AgCl\](s) in \[0.1\,M\,NaCl\]at \[25{}^\circ C.\,\] \[{{K}_{sp}}(AgCl)=2.8\times {{10}^{-10}}\] [UPSEAT 2001] |
| A. | \[3.0\times {{10}^{-8}}M{{L}^{-1}}\] |
| B. | \[2.5\times {{10}^{-7}}M{{L}^{-1}}\] |
| C. | \[2.8\times {{10}^{-9}}M{{L}^{-1}}\] |
| D. | \[2.5\times {{10}^{7}}M{{L}^{-1}}\] |
| Answer» D. \[2.5\times {{10}^{7}}M{{L}^{-1}}\] | |
| 6844. |
The stability of the following alkali metal chlorides follows the order [MP PET/PMT 1998] |
| A. | \[LiCl>KCl>NaCl>CsCl\] |
| B. | \[CsCl>KCl>NaCl>LiCl\] |
| C. | \[NaCl>KCl>LiCl>CsCl\] |
| D. | \[KCl>CsCl>NaCl>LiCl\] |
| Answer» C. \[NaCl>KCl>LiCl>CsCl\] | |
| 6845. |
Total number of isomers of \[{{C}_{6}}{{H}_{14}}\] are [IIT-JEE 1987; DPMT 1983; CPMT 1991; MNR 1990; MP PET 1995; UPSEAT 2001] |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 6846. |
If the solubility product of lead iodide \[(Pb{{l}_{2}})\] is \[3.2\times {{10}^{-8}},\] then its solubility in moles/litre will be [MP PMT 1990] |
| A. | \[2\times {{10}^{-3}}\] |
| B. | \[4\times {{10}^{-4}}\] |
| C. | \[1.6\times {{10}^{-5}}\] |
| D. | \[1.8\times {{10}^{-5}}\] |
| Answer» B. \[4\times {{10}^{-4}}\] | |
| 6847. |
Which of the following halides is most acidic [KCET 1996] |
| A. | \[PC{{l}_{3}}\] |
| B. | \[SbC{{l}_{3}}\] |
| C. | \[BiC{{l}_{3}}\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» B. \[SbC{{l}_{3}}\] | |
| 6848. |
If the solubility products of \[AgCl\] and \[AgBr\] are \[1.0\times {{10}^{-8}}\,M\] and \[3.5\times {{10}^{-13}}\] respectively, then the relation between the solubilities (denoted by the symbol\['S'\]) of these salts can correctly be represented as [MP PET 1994] |
| A. | \[S\]of \[AgBr\]is less than that of \[AgCl\] |
| B. | \[S\]of \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\]is greater than that of \[AgCl\] |
| C. | \[{{10}^{-11}}M\]of \[BOH+{{H}^{+}}\] is equal to that of \[AgCl\] |
| D. | \[S\]of \[AgBr\] is \[{{10}^{6}}\] times greater than that of \[AgCl\] |
| Answer» B. \[S\]of \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\]is greater than that of \[AgCl\] | |
| 6849. |
Which is insoluble in water [CPMT 2003] |
| A. | \[{{H}_{2}}S\] |
| B. | \[HgC{{l}_{2}}\] |
| C. | \[Ca{{(N{{O}_{3}})}_{2}}\] |
| D. | \[Ca{{F}_{2}}\] |
| Answer» E. | |
| 6850. |
The number of optical isomers of an organic compound having n asymmetric carbon atoms will be [MP PET 1994] |
| A. | \[{{2}^{n+1}}\] |
| B. | \[{{n}^{2}}\] |
| C. | \[{{2}^{n}}\] |
| D. | \[{{2}^{n-1}}\] |
| Answer» D. \[{{2}^{n-1}}\] | |