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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.
| 3851. |
The reaction, \[X+2Y+Z\to N\] occurs by the following mechanism (i) \[X+Y\rightleftharpoons M\] (very rapid equilibrium) (ii) \[M+Z\to O\](slow) (iii) \[O+Y~\to N\](very fast) What is the rate law for this reaction? |
| A. | Rate = k[Z] |
| B. | Rate = k[X] \[{{[Y]}^{2}}\] [Z] |
| C. | Rate = k[N] |
| D. | Rate = k[X] [Y] [Z] |
| Answer» E. | |
| 3852. |
\[{{t}_{1/4}}\] can be taken as the time taken for concentration of reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is k, then \[{{t}_{1/4}}\] can be written as |
| A. | 0.10/K |
| B. | 0.29/K |
| C. | 0.69/K |
| D. | 0.15/K |
| Answer» C. 0.69/K | |
| 3853. |
The energy of activations for forward and backward change for an endothermic reaction; X \[\to \] Y are \[{{E}_{F}}\] and \[{{E}_{b}}\] respectively. Which is correct? |
| A. | \[{{E}_{b}}<{{E}_{F}}\] |
| B. | \[{{E}_{b}}>{{E}_{F}}\] |
| C. | \[{{E}_{b}}={{E}_{F}}\] |
| D. | No relation between them |
| Answer» B. \[{{E}_{b}}>{{E}_{F}}\] | |
| 3854. |
Which one of the following is wrongly matched? |
| A. | Saponification of \[C{{H}_{3}}COOC{{H}_{5}}\]- Second order reaction |
| B. | Hydrolysis of \[C{{H}_{3}}COOC{{H}_{3}}\]- Pseudo unimolecular reaction |
| C. | Decomposition of \[{{H}_{2}}{{O}_{2}}\]- First order reaction |
| D. | Combination of \[{{H}_{2}}\] and \[{{B}_{2}}\] to give HBr -Zero order reaction |
| Answer» E. | |
| 3855. |
The rate law of a reaction \[A\text{ }+\text{ }B\text{ }\to \]Product is rate =\[k{{[A]}^{n}}\]\[{{[B]}^{n}}\] On doubling the concentration of A and halving the concentration of B, the ratio of new rate to the earlier rate of reaction will be |
| A. | \[n-m\] |
| B. | \[{{2}^{n-m}}\] |
| C. | \[\frac{1}{{{2}^{m+n}}}\] |
| D. | \[m+n\] |
| Answer» C. \[\frac{1}{{{2}^{m+n}}}\] | |
| 3856. |
Consider a first order decomposition process \[{{A}_{3}}\to \frac{3}{2}{{A}_{2}}\] A plot of concentration of \[{{A}_{3}}\] and \[{{A}_{2}}\] versus time is shown below. At time \[{{t}_{A}}\] percentage of reactant decomposed is |
| A. | 75% |
| B. | 0.5 |
| C. | 40% |
| D. | 0.3 |
| Answer» D. 0.3 | |
| 3857. |
The rate of a first order reaction is \[0.04\text{ }mol{{L}^{-1}}{{S}^{-1}}\] at 30 min and \[0.03\text{ }mol{{L}^{-1}}{{S}^{-1}}\] at 40 min. Thus, half-life of the reaction is |
| A. | 32.4 mm |
| B. | 51.2 mm |
| C. | 46.8 mm |
| D. | 24.1 min |
| Answer» E. | |
| 3858. |
Which of the following plot(s) is/are correct for the first order reaction? |
| A. | I, II |
| B. | II, III |
| C. | I, II, III |
| D. | I, III |
| Answer» D. I, III | |
| 3859. |
The dissociation of nitrogen pentaoxide is a first order reaction. In first 12 min, 75% of nitrogen pentaoxide is dissociated. What amount of nitrogen pentaoxide will be left behind after one hour of the start of reaction? |
| A. | 3.01% |
| B. | 0.0021 |
| C. | 0.00098 |
| D. | None of these |
| Answer» D. None of these | |
| 3860. |
The rate constant of a certain reaction is given by log\[K\text{ }=A-\frac{B}{T}+C\,\log \,T\]. Then activation energy of reaction at 300 K is: |
| A. | \[\frac{B}{T}+C\,\log \,T\] |
| B. | \[[2.303\,B+CT]R\] |
| C. | C log T |
| D. | B + CTR |
| Answer» C. C log T | |
| 3861. |
A hydrogenation reaction is carried out at 500 K. \[C{{H}_{2}}=C{{H}_{2}}+{{H}_{2}}\xrightarrow[no\,catalyst]{500k}C{{H}_{3}}-C{{H}_{3}}\] Activation energy \[-\,{{E}_{a}}\,KJ\,mo{{l}^{-1}}\] \[C{{H}_{2}}=C{{H}_{2}}+{{H}_{2}}\xrightarrow{pd,400k}C{{H}_{3}}-C{{H}_{3}}\] Activation energy = (\[{{E}_{a}}-20\]) KJ \[mo{{l}^{-1}}\] If rate remains constant, then \[{{E}_{a}}\] is |
| A. | \[120\text{ }kJmo{{l}^{-1}}\] |
| B. | \[100\text{ }kJmo{{l}^{-1}}\] |
| C. | \[20kJmo{{l}^{-1}}\] |
| D. | \[80\text{ }kJmo{{l}^{-1}}\] |
| Answer» C. \[20kJmo{{l}^{-1}}\] | |
| 3862. |
To an equilibrium mixture of\[2S{{O}_{2}}(g)+{{O}_{2}}(g)\rightleftarrows 2S{{O}_{2}}(g)\] some helium, an inert gas, is added at constant volume. The addition of helium causes the total pressure to double. Which of the following is true? |
| A. | The concentration of the three gases is unchanged |
| B. | The concentration of sulphur trioxide increases |
| C. | The number of moles of sulphur trioxide increases |
| D. | The concentration of sulphur dioxide increases |
| Answer» B. The concentration of sulphur trioxide increases | |
| 3863. |
'a' moles of \[PC{{l}_{5}}\], undergoes, thermal dissociation as:\[PC{{l}_{5}}\rightleftarrows PC{{l}_{3}}+C{{l}_{2}}\], the mole fraction of \[PC{{l}_{3}}\]at equilibrium is 0.25 and the total pressure is 2.0 atmosphere. The partial pressure of \[C{{I}_{2}}\]at equilibrium is: |
| A. | 2.5 |
| B. | 1 |
| C. | 0.5 |
| D. | None of these |
| Answer» D. None of these | |
| 3864. |
Consider following reaction in equilibrium concentration 0.01 M of every species(I) \[PC{{l}_{5}}(g)\rightleftarrows PC{{l}_{3}}(g)+C{{l}_{2}}(g)\](II) \[2HI(g)\rightleftarrows {{H}_{2}}(g)+{{I}_{2}}(g)\](III) \[{{N}_{2}}(g)+3{{H}_{2}}(g)\rightleftarrows 2N{{H}_{3}}(g)\]Extent of the reactions taking place is |
| A. | I > II > III |
| B. | I < II < III |
| C. | II < III < I |
| D. | III < I < II |
| Answer» C. II < III < I | |
| 3865. |
The reaction which proceeds in the forward direction is |
| A. | \[F{{e}_{2}}{{O}_{3}}+6HCl\to 2FeC{{l}_{3}}+3{{H}_{2}}O\] |
| B. | \[N{{H}_{3}}+{{H}_{2}}O+NaCl\to N{{H}_{4}}Cl+NaOH\] |
| C. | \[SnC{{l}_{4}}+HgC{{l}_{2}}\to SnC{{l}_{2}}+2HgC{{l}_{2}}\] |
| D. | \[2Cul+{{I}_{2}}+4{{K}^{+}}\to 2C{{u}^{2+}}+4KI\] |
| Answer» B. \[N{{H}_{3}}+{{H}_{2}}O+NaCl\to N{{H}_{4}}Cl+NaOH\] | |
| 3866. |
If in the reaction \[{{N}_{2}}{{O}_{4}}=2N{{O}_{2,}}\,a\]is that part of \[{{N}_{2}}{{O}_{4}}\]which dissociates, then the number of moles at equilibrium will be |
| A. | 3 |
| B. | 1 |
| C. | \[{{(1-a)}^{2}}\] |
| D. | \[{{(1+a)}^{2}}\] |
| Answer» E. | |
| 3867. |
At constant temperature, the equilibrium constant (\[Kp\]) for the decomposition reaction \[{{N}_{2}}{{O}_{4}}\rightleftarrows 2N{{O}_{2}}\] is expressed by \[{{K}_{P}}=\frac{(4{{x}^{2}}p)}{(1-{{x}^{2}})}\], where p=pressure, x=extent of decomposition. Which one of the following statements is true? |
| A. | \[{{K}_{P}}\]increases with increase of p |
| B. | \[{{K}_{P}}\]increases with increase of x |
| C. | \[{{K}_{P}}\]increases with decrease of x |
| D. | \[{{K}_{P}}\]remains constant with change in p and x |
| Answer» E. | |
| 3868. |
Pure ammonia is placed in a vessel at a temperature where its dissociation constant is appreciable. At equilibrium: |
| A. | \[{{K}_{p}}\]does not change significantly with pressure |
| B. | \[\alpha \] does not change with pressure |
| C. | concentration of \[N{{H}_{3}}\]does not change with pressure |
| D. | concentration of hydrogen is less than that of nitrogen |
| Answer» B. \[\alpha \] does not change with pressure | |
| 3869. |
The equilibrium constant for the reversible reaction, \[{{N}_{2}}+3{{H}_{2}}\rightleftarrows 2N{{H}_{3}}\]is K and for the reaction \[\frac{1}{2}{{N}_{2}}+\frac{3}{2}{{H}_{2}}\rightleftarrows N{{H}_{3}}\] the equilibrium constant is K'. K and K' will be related as |
| A. | \[K=K'\] |
| B. | \[K'=\sqrt{K}\] |
| C. | \[K=\sqrt{K'}\] |
| D. | \[K\times K'=1\] |
| Answer» C. \[K=\sqrt{K'}\] | |
| 3870. |
Consider the following equilibrium in a closed container\[{{N}_{2}}{{O}_{4(g)}}\rightleftharpoons 2N{{O}_{2}}(g)\]At a fixed temperature, the volume of the raction container is halved. For this change, which of the statements holds true regarding the equilibrium constant \[({{K}_{p}})\]and the degree of dissociation \[(\alpha )?\] |
| A. | Neither \[{{K}_{p}}\]nor a changes |
| B. | Both \[{{K}_{p}}\]and a change |
| C. | \[{{K}_{p}}\]changes but a does not change |
| D. | \[{{K}_{p}}\]does not change but a change |
| Answer» E. | |
| 3871. |
For the chemical reaction \[3X(g)+Y(g)\rightleftharpoons {{X}_{3}}Y(g)\] The amount of \[{{X}_{3}}Y\]at equilibrium is affected by |
| A. | temperature and pressure |
| B. | temperature only |
| C. | pressure only |
| D. | temperature, pressure, and catalyst |
| Answer» B. temperature only | |
| 3872. |
For the reaction: \[{{H}_{2}}(g)+{{I}_{2}}(g)\rightleftarrows 2HI(g)\] The equilibrium constant \[Kp\]changes with |
| A. | total pressure |
| B. | catalyst |
| C. | the amounts of \[{{H}_{2}}\]and \[{{I}_{2}}\]present |
| D. | temperature |
| Answer» E. | |
| 3873. |
One mole of \[{{N}_{2}}{{O}_{4}}(g)\]at 300 K is kept in closed container under one atmosphere. It is heated to 600 K when 20% by mass of \[{{N}_{2}}{{O}_{4}}(g)\]decomposes to \[N{{O}_{2}}(g)\]. The lresultant pressure is |
| A. | 1.2 atm |
| B. | 2.4 atm |
| C. | 2.0 atm |
| D. | 1.0 atm |
| Answer» C. 2.0 atm | |
| 3874. |
The standard Gibbs energy change at 300 K for the reaction \[2A\to B+C\]is 2494.2J. At a given time, the composition of the reaction mixture is [A]=\[\frac{1}{2},[B]=2\,and\,(C)=\frac{1}{2}\]. [R=8.314J/Kmol, e=2.718] |
| A. | forward direction because \[Q>{{K}_{C}}\] |
| B. | reverse direction because \[Q>{{K}_{C}}\] |
| C. | forward direction because \[Q<{{K}_{C}}\] |
| D. | reverse direction because \[Q<{{K}_{C}}\] |
| Answer» C. forward direction because \[Q<{{K}_{C}}\] | |
| 3875. |
What is the equilibrium constant for the reaction? \[{{P}_{4(s)}}+5{{O}_{2(g)}}\rightleftarrows {{P}_{4}}{{O}_{10(s)}}\] |
| A. | \[{{K}_{C}}=\frac{1}{{{\left[ {{O}_{2}} \right]}^{5}}}\] |
| B. | \[{{K}_{C}}=\frac{\left[ {{P}_{4}}{{O}_{10}} \right]}{5\left[ {{P}_{4}} \right]\left[ {{O}_{2}} \right]}\] |
| C. | \[{{K}_{C}}={{\left[ {{O}_{2}} \right]}^{5}}\] |
| D. | \[{{K}_{C}}=\frac{\left[ {{P}_{4}}{{O}_{10}} \right]}{5\left[ {{P}_{4}} \right]{{\left[ {{O}_{2}} \right]}^{5}}}\] |
| Answer» B. \[{{K}_{C}}=\frac{\left[ {{P}_{4}}{{O}_{10}} \right]}{5\left[ {{P}_{4}} \right]\left[ {{O}_{2}} \right]}\] | |
| 3876. |
The equilibrium constant for the reaction; \[{{N}_{2(g)}}+{{O}_{2(g)}}\rightleftarrows 2N{{O}_{(g)}}\] at temperature T is \[4\times {{10}^{-4.}}\].The value of \[{{K}_{c}}\]for the reaction. \[N{{O}_{(g)}}\rightleftarrows 1/2{{N}_{2(g)}}+1/2{{O}_{2(g)}}\]at the temperature is |
| A. | 0.02 |
| B. | 50 |
| C. | \[4\times {{10}^{-4}}\] |
| D. | \[2.5\times {{10}^{-2}}\] |
| Answer» C. \[4\times {{10}^{-4}}\] | |
| 3877. |
\[{{N}_{2}}{{O}_{4}}\]is 10% dissociated at a total pressure \[{{P}_{1}}\]and 20% dissociated at a total pressure \[{{P}_{2}}\]. Then ration \[{{P}_{1}}/{{P}_{2}}\]is |
| A. | \[\frac{1}{2}\] |
| B. | \[\frac{2}{1}\] |
| C. | \[\frac{1}{4}\] |
| D. | \[\frac{4}{1}\] |
| Answer» E. | |
| 3878. |
In which of the following reaction the value of \[Kp\]will be equal to \[{{K}_{c}}\]? |
| A. | \[{{H}_{2}}+{{I}_{2}}\rightleftarrows 2HI\] |
| B. | \[PC{{l}_{5}}\rightleftarrows PC{{l}_{3}}+C{{l}_{2}}\] |
| C. | \[2N{{H}_{3}}\rightleftarrows {{N}_{2}}+3{{H}_{2}}\] |
| D. | \[2S{{O}_{2}}+{{O}_{2}}\rightleftarrows 2S{{O}_{3}}\] |
| Answer» B. \[PC{{l}_{5}}\rightleftarrows PC{{l}_{3}}+C{{l}_{2}}\] | |
| 3879. |
The electronegativity difference between N and F is greater than that between N and H, yet the dipole moment of \[N{{H}_{3}}\] (1.5 D) is larger than that of \[N{{F}_{3}}\] (0.2 D). This is because |
| A. | In \[N{{H}_{3}}\] the atomic dipole and bond dipole are in the same direction, whereas in \[N{{F}_{3}}\] these are in opposite directions |
| B. | In \[N{{H}_{3}}\] as well as \[N{{F}_{3}}\] the atomic dipole and bond dipole are in opposite directions |
| C. | In \[N{{H}_{3}}\] the atomic dipole and bond dipole are in the opposite directions, whereas in\[N{{F}_{3}}\]? 3 these are in the same direction |
| D. | In \[N{{H}_{3}}\] as well as in\[N{{F}_{3}}\] the atomic dipole and bond dipole are in the same direction |
| Answer» B. In \[N{{H}_{3}}\] as well as \[N{{F}_{3}}\] the atomic dipole and bond dipole are in opposite directions | |
| 3880. |
The statement true for azide ion (\[{{N}_{3}}^{\odot }\]) is |
| A. | It has a non-linear structure |
| B. | It is called pseudo halogens |
| C. | The formal oxidation state of N in this anion I -1 |
| D. | It is isoelectronic with \[N{{O}_{2}}\] |
| Answer» D. It is isoelectronic with \[N{{O}_{2}}\] | |
| 3881. |
\[{{H}_{2}}O\] is dipolar, whereas \[Be{{F}_{2}}\] is not. It I because |
| A. | The electronegativity of F is greater than that of 0 |
| B. | \[{{H}_{2}}O\] involves hydrogen bonding whereas \[Be{{F}_{2}}\] is a discrete molecule |
| C. | \[{{H}_{2}}O\] is linear and \[Be{{F}_{2}}\] is angular |
| D. | \[{{H}_{2}}O\] is angular and \[Be{{F}_{2}}\] is linear |
| Answer» E. | |
| 3882. |
Which of the following have distorted octahedral structure? |
| A. | \[S{{F}_{6}}\] |
| B. | \[P{{F}^{\odot }}_{6}\] |
| C. | \[Si{{F}^{2-}}_{6}\] |
| D. | \[Xe{{F}_{6}}\] |
| Answer» E. | |
| 3883. |
The correct statement for the molecule \[Cs{{I}_{3}}\] is |
| A. | It is a covalent molecule |
| B. | It contains \[C{{s}^{+}}\] and \[{{I}^{-}}_{3}\] |
| C. | It contains \[C{{s}^{3+}}\] and \[{{I}^{-}}\] ions |
| D. | It contains \[C{{s}^{+}}\],\[{{I}^{-}}\] and lattice \[{{I}^{{}}}_{2}\] molecule |
| Answer» C. It contains \[C{{s}^{3+}}\] and \[{{I}^{-}}\] ions | |
| 3884. |
Which of the following Lewis structure does not contribute in resonance? |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» C. III | |
| 3885. |
The compound which contains both covalent and co-ordinate bond is |
| A. | \[{{C}_{2}}{{H}_{5}}NC\] |
| B. | \[{{C}_{2}}{{H}_{5}}CN\] |
| C. | \[HCN\] |
| D. | None of these |
| Answer» B. \[{{C}_{2}}{{H}_{5}}CN\] | |
| 3886. |
Which of the following have been arranged in increasing bond order as well as bond dissociation energy? |
| A. | \[{{O}_{2}}^{-2}<{{O}_{2}}^{\odot }<{{O}^{\oplus }}_{2}<{{O}_{2}}\] |
| B. | \[{{O}_{2}}^{-2}<{{O}_{2}}^{\odot }<{{O}_{2}}<{{O}_{2}}\] |
| C. | \[{{O}_{2}}\]\[<{{O}^{\oplus }}_{2}\]\[<\]\[{{O}_{2}}^{2-}\]\[<{{O}_{2}}^{\odot }\] |
| D. | \[{{O}^{\oplus }}_{2}\]\[<\]\[{{O}_{2}}^{2-}\]\[<{{O}_{2}}^{\odot }\]\[<{{O}_{2}}\] |
| Answer» C. \[{{O}_{2}}\]\[<{{O}^{\oplus }}_{2}\]\[<\]\[{{O}_{2}}^{2-}\]\[<{{O}_{2}}^{\odot }\] | |
| 3887. |
\[As{{F}_{5}}\] molecule is \[s{{p}^{3}}\]d hybridised and is trigonal bipyramidal (Tbp) shape. Which J-orbital is involved in \[s{{p}^{3}}\]d hybridisation. |
| A. | \[d{{x}^{2}}-{{y}^{2}}\] |
| B. | \[d{{z}^{2}}\] |
| C. | \[dxy\] |
| D. | \[dzx\] |
| Answer» B. \[d{{z}^{2}}\] | |
| 3888. |
Which of the following statements is correct for CO? |
| A. | A double bond between C and 0 atoms |
| B. | \[1\sigma \], \[1\pi \]In and 1 coordinate bond between C and 0 atoms |
| C. | One lone pair of electrons on each atom |
| D. | \[1\sigma \],\[2\pi \] bonds between C and 0 atoms |
| Answer» C. One lone pair of electrons on each atom | |
| 3889. |
Which of the following diatomic molecules would be stabilised by the removal of an electron? |
| A. | \[{{O}_{2}}\] |
| B. | \[C{{N}^{\odot }}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[{{C}_{2}}\] |
| Answer» B. \[C{{N}^{\odot }}\] | |
| 3890. |
Which one of the following constitutes a group of the isoelectronic species? |
| A. | \[{{C}^{2-}}_{2},{{O}^{-}}_{2}CO,NO\] |
| B. | \[N{{O}^{+}}\],\[{{C}^{2-}}_{2},\]\[C{{N}^{-}},\]\[{{N}_{2}}\] |
| C. | \[C{{N}^{-}},\]\[{{N}_{2}}\],\[{{O}^{2-}}_{2},\]\[{{C}^{2-}}_{2},\] |
| D. | \[N{{O}_{2}}\],\[{{O}_{2}}\],\[N{{O}^{+}}\],\[CO\] |
| Answer» C. \[C{{N}^{-}},\]\[{{N}_{2}}\],\[{{O}^{2-}}_{2},\]\[{{C}^{2-}}_{2},\] | |
| 3891. |
In which of the following pairs, the two species are not isostructural? |
| A. | \[C{{O}^{2-}}_{3}\,and\,N{{O}^{-}}_{3}\] |
| B. | \[PC{{l}^{+}}_{4}\,and\,SiC{{l}^{{}}}_{4}\] |
| C. | \[P{{F}_{5}}\,and\,Br{{F}_{5}}\] |
| D. | \[Al{{F}^{3-}}_{6}\,and\,S{{F}_{5}}\] |
| Answer» D. \[Al{{F}^{3-}}_{6}\,and\,S{{F}_{5}}\] | |
| 3892. |
In which of the following ionization processes, the bond order has increased and the magnetic behavior has changed? |
| A. | \[{{C}_{2}}\to {{C}^{+}}_{2}\] |
| B. | \[NO\to N{{O}^{+}}\] |
| C. | \[{{O}_{2}}\to {{O}^{+}}_{2}\] |
| D. | \[{{N}_{2}}\to {{N}^{+}}_{2}\] |
| Answer» C. \[{{O}_{2}}\to {{O}^{+}}_{2}\] | |
| 3893. |
In which of the following molecules/ions\[B{{F}_{3}}\],\[N{{O}^{-}}_{2}\] \[N{{H}^{-}}_{2}\], and \[{{H}_{2}}O\] the central atom is \[s{{p}^{2}}_{}\] hybridized? |
| A. | \[B{{F}_{3}}\]and \[N{{O}^{-}}_{2}\] |
| B. | \[N{{O}^{-}}_{2}\]and \[N{{H}^{-}}_{2}\] |
| C. | \[N{{H}^{-}}_{2}\]and \[{{H}_{2}}O\] |
| D. | \[N{{O}^{-}}_{2}\]and \[{{H}_{2}}O\] |
| Answer» B. \[N{{O}^{-}}_{2}\]and \[N{{H}^{-}}_{2}\] | |
| 3894. |
Which one of the following species is diamagnetic in nature? |
| A. | \[H{{e}^{+}}_{2}\] |
| B. | \[{{H}_{2}}\] |
| C. | \[{{H}^{+}}_{2}\] |
| D. | \[{{H}^{-}}_{2}\] |
| Answer» C. \[{{H}^{+}}_{2}\] | |
| 3895. |
In which of the following pairs bond angle is\[109{}^\circ 28'\]? |
| A. | \[[N{{H}^{+}}_{4}],[B{{F}^{-}}_{4}]\] |
| B. | \[N{{H}^{+}}_{4}\],\[[B{{F}_{3}}]\] |
| C. | \[B{{H}_{2}}^{-}\][\[B{{F}^{-}}_{4}\]] |
| D. | \[[N{{H}^{{}}}_{3}]\],\[B{{F}^{{}}}_{3}\] |
| Answer» B. \[N{{H}^{+}}_{4}\],\[[B{{F}_{3}}]\] | |
| 3896. |
Two elements X and Y have following electronic Configurations\[X:1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{2}}\,3{{s}^{2}}\,3{{p}^{6}}4{{s}^{2}}\]\[Y:1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\,3{{s}^{2}}\,3{{p}^{5}}\]The expected compound formed by combination of X and Y will be expressed as |
| A. | \[X{{Y}_{2}}\] |
| B. | \[{{X}_{5}}{{Y}_{2}}\] |
| C. | \[{{X}_{2}}{{Y}_{5}}\] |
| D. | \[{{X}_{{}}}{{Y}_{5}}\] |
| Answer» B. \[{{X}_{5}}{{Y}_{2}}\] | |
| 3897. |
How many pairs in the gene are needed to code for the enzyme, lysozyme, containing 129 amino acids found in egg white? |
| A. | \[3\text{ }\times \text{ }129\] base pairs |
| B. | \[\left( 3\times 129 \right)+\left( 3\times 3 \right)=396\]base pairs |
| C. | \[\left( 3\times 129 \right)+\left( 3\times 2 \right)=393\]base pairs |
| D. | 4\[\times \]129 base pairs |
| Answer» D. 4\[\times \]129 base pairs | |
| 3898. |
Which of the following is not a fat soluble vitamin? |
| A. | Vitamin B complex |
| B. | Vitamin D |
| C. | Vitamin E |
| D. | Vitamin A |
| Answer» B. Vitamin D | |
| 3899. |
Which of the statements about "Denaturation" given below are correct? (1) Denaturation of proteins causes loss of secondary and tertiary structure of the proteins. (2) Denaturation leads to the conversion of double strand of DNA into single strand. (3) Denaturation affects primary structure which gets distorted. |
| A. | (2) and (3) |
| B. | (1) and (3) |
| C. | (1) and (2) |
| D. | (1), (2) and (3) |
| Answer» D. (1), (2) and (3) | |
| 3900. |
The number of disulphide linkages present in insulin is |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |