Recent questions tagged 2017

In Bougainvillea thorns are the modifications of :

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Which of the following are found is extreme saline conditions ?

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Zygotic meiosis is characteristic of :

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Which of the following options best represents the enzyme composition of pancreatic juice ?

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Root hairs develop from the region of :

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Which of the following is made up of dead cells ?

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Coconut fruit is

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Plants which produce characteristic pneumatophores and show vivipary belong to :

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A dioecious flowering plant prevents both :

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An example of colonial alga is :

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Which of the following components provides sticky character to the bacterial cells ?

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Which of the following are not polymeric ?

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Which one of the following statements is correct with reference to enzymes ?

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Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of :

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Which of the following options gives the correct sequences of events during mitosis ?

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DNA fragments are

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GnRH, a hypothalamic hormone, needed in reproduction, acts on

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The association of histone H1 with a nucleosome indicates :

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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

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The final proof for DNA as the genetic material came from the experiments of

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A gene whose expression helps to identify transformed cell is known as

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Fruit and leaf drop at early stages can be prevented by the application of

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In case of poriferans, the spongocoel is lined with flagellated cells called :

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The vascular cambium normally gives rise to :

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Asymptote in a logistic growth curve is obtained when :

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Which of the following reactions is appropriate for converting acetamide to methanamine ?

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The species, having bond angles of $120^o$ is

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If molality of the dilute solution is doubled, the value of molal depression constant $(K_f)$ will be

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Which one is the correct order of acidity ?

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The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

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Ionic mobility of which of the following alkali metal ions is lowest when aqueous solutions of their salts are put under an electric filed?

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Which one of the following statements is not correct ?

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$HgCl_2$ and $I_2$ both when dissolved in water containing $I^–$ ions pair of species formed is :

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Which of the following pairs of compounds is isoelectronic and isostructural ?

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For a given reaction, $\Delta H = 35.5\; KJ\; mol^{-1}$ and $\Delta S = 83.6 \; JK^{-1} mol^{-1}$. The reaction is spontaneous at : (Assume that $\Delta H$ and $\Delta S$ do not vary with temperature)

asked Aug 21, 2018 by pady_1

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The correct statement regarding electrophile is :

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Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $Co^{3+}$ is -

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A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $\Delta U$ of the gas in joules will be -

asked Aug 21, 2018 by pady_1

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In the electrochemical cell - $Zn|ZnSO_4 \; (0.01 M) || CuSO_4 \; (1.0 M) | Cu$, the emf of this Daniel cell is $E_1$. When the concentration of $ZnSO_4$ is changed to $0.1 M$ and that of $CuSO_4$ changed to $0.01 M$, the emf changes to $E_2$. From the followings, which one is the relayionship between $E_1$ and $E_2$ ? (Given , $\frac{RT}{F} = 0.059$)

asked Aug 21, 2018 by pady_1

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asked Aug 21, 2018 by pady_1

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Predict the correct intermediate and product in the following reaction : $H_3C - CH \equiv CH \xrightarrow[\text{$HgSO_4$}]{\text{$H_2O, H_2SO_4$}} \stackrel{\hbox{Intermediate}}{\hbox{(A)}} \to \stackrel{\hbox{Product}}{\hbox{(B)}}$

asked Aug 21, 2018 by pady_1

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Machanism of a hypothetical reaction $X_2 + Y_2 \to 2XY$ is given below. (i) $X_2 \to X + X (fast)$ (ii) $X + Y_2 \rightleftharpoons XY + Y (slow)$ (iii) $X + Y \to XY (fast) $ The overall order of the reaction will be -

asked Aug 21, 2018 by pady_1

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Consider the reactions : Identify A, X, Y and Z

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A first order reaction has a specific reaction rate of $10^{–2} sec^{–1}$. How much time will it take for $20 \;g$ of the reactant to reduce to $5g$ ?

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Which one is the most acidic compound ?

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Which one is the wrong statement ?

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An example of a sigma bonded organometallic compound is-

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The correct order of the stoichiometries of $AgCl$ formed when $AgNO_3$ in excess is treated with the complexes : $CoCl_3.6NH_3, CoCl_3.5NH_3, CoCl_3.4NH_3$ respectively is -

asked Aug 21, 2018 by pady_1

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Which of the following is dependent on temperature ?

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Which is the incorrect statement ?

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