Recent questions and answers in 2011

The function of leghaemoglobin in the root nodules of legumes is :

answered Mar 30, 2020 by krishapveni

2 answers

The Lassaigne's extract is boiled with conc. $HNO_3$ while tessting for halogens. By doing so it :

answered Feb 17, 2020 by meena.clay6

1 answer

In the following reactions, the major product (A) and (C) are respectively :

answered Feb 17, 2020 by meena.clay6

1 answer

In Duman's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compond would be : (Aqueous tension at 300 K = 15 mm)

answered Feb 17, 2020 by meena.clay6

1 answer

The value of $\Delta H$ for the reaction $X_{2(g)} + 4Y_{2(g)} \rightleftharpoons 2XY_{4(g)}$ is less than zero. Formation of $XY_{4(g)}$ will be favoured at :

answered Feb 17, 2020 by meena.clay6

1 answer

Which of the following has the minimum bond length ?

answered Feb 17, 2020 by meena.clay6

1 answer

Of the following complex ions, which is diamagnetic in nature ?

answered Feb 17, 2020 by meena.clay6

1 answer

The d-electron configurations of $Cr^{2+}, Mn^{2+}, Fe^{2+}$ and $Co^{2+}$ are $d^4, d^5, d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour ? (At. Nos. Cr= 24, Mn= 25, Fe= 26, Co = 27)

answered Feb 17, 2020 by meena.clay6

1 answer

Name the type of the structure of silicate in which one oxygen atom of $[SiO_4]^{4–}$ is shared ?

answered Feb 17, 2020 by meena.clay6

1 answer

The complexes $[Co(NH_3)_6]$ $[Cr(CN)_6]$ and $[Cr(NH_3)_6]$ $[Co(CN)_6]$ are the examples of which type of isomerism ?

answered Feb 17, 2020 by meena.clay6

1 answer

The complex $[Pt\; (Py)\; (NH_3)\; Br\; Cl]$ will have how many geometrical isomers ?

answered Feb 17, 2020 by meena.clay6

1 answer

Which of the following is least likely to behave as Lewis base ?

answered Feb 17, 2020 by meena.clay6

1 answer

Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, $NO_2^-, NO_3^-, NH_2^-, NH_4^+, SCN^-$ ?

answered Feb 17, 2020 by meena.clay6

3 answers

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

answered Feb 17, 2020 by meena.clay6

1 answer

Acidified $K_2Cr_2O_7$ solution turns green when $Na_2SO_3$ is added to it. This is due to the formation of :

answered Feb 17, 2020 by meena.clay6

1 answer

The correct order of increasing bond length of $C – H, C – O, C – C$ and $C = C$ is :

answered Feb 17, 2020 by meena.clay6

1 answer

If n = 6, the correct sequence for filling of electrons will be :

answered Feb 17, 2020 by meena.clay6

1 answer

Enthalpy change for the reaction, $4H_{(g)} \to 2H_{2(g)}$ is $–869.6\;kJ$ The dissociation energy of H – H bond is

answered Feb 17, 2020 by meena.clay6

2 answers

The energies $E_1$ and $E_2$ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. $\lambda_1$ and $\lambda_2$ will be:

answered Feb 13, 2020 by meena.clay6

1 answer

The freezing point depression constant for water is $–1.86\;Cm^{–1}$. If $5.00 \;g$ $Na_2SO_4$ is dissolved in $45.0g\; H_2O$, the freezing point is changed by $–3.82^o C$. Calculate the Van't Hoff factor for $Na_2SO_4$

answered Feb 13, 2020 by meena.clay6

1 answer

If the $E^o_{cell}$ for a given reaction has a negative value, then which of the following gives the correct relationships for the values of $\Delta {G^o}$ and $K_{eq}$ ?

answered Feb 13, 2020 by meena.clay6

1 answer

A gaseous mixture was prepared by taking equal mole of $CO$ and $N_2$. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen $(N_2)$ in the mixture is :

answered Feb 13, 2020 by meena.clay6

1 answer

If the enthalpy change for the transition of liquid water to steam is $30\; kJ \; mol^{–1}$ at $27^oC$, the entropy change for the process would be :

answered Feb 11, 2020 by meena.clay6

1 answer

Standard electrode potential for $Sn^{4+}/Sn^{2+}$ couple is $+0.15 V$ and that for the $Cr^{3+}/ Cr$ couple is $–0.74 V$. These two couples in their standard state are connected to make a cell. The cell potential will be :

answered Feb 11, 2020 by meena.clay6

1 answer

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process ?

answered Feb 11, 2020 by meena.clay6

1 answer

For the reaction $N_2 (g) + O_2(g) \leftrightharpoons 2NO (g)$, the equilibrium constant is $K_1$. The equilibrium constant is $K_2$ for the reaction $2NO(g) + O_2(g) \rightleftharpoons 2NO_2 (g).$ What is $K$ for the reaction $NO_2 (g) \rightleftharpoons 1/2 N_2 (g) + O_2 (g)$ ?

answered Feb 11, 2020 by meena.clay6

1 answer

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?

answered Feb 11, 2020 by meena.clay6

1 answer

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be :

answered Feb 11, 2020 by meena.clay6

1 answer

A buffer solution is prepared in which the concentration of $NH_3$ is 0.30 M and the concentration of $NH_4^+$ is 0.20 M. If the equilibrium constant, $K_b$ for $NH_3$ equals $1.8 × 10^{–5}$, what is the pH of this solution? ($\log 2.7 = 0.43$)

answered Feb 11, 2020 by meena.clay6

1 answer

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled ?

answered Feb 11, 2020 by meena.clay6

1 answer

Mole fraction of the solute in a 1.00 molal aqueous solution is :

answered Feb 11, 2020 by meena.clay6

1 answer

The electrode potentials for $Cu^{2+}_{(aq)} + e^- \to Cu^+_{(aq)} $ and $Cu^+ _{(aq)} + e^- \to Cu_{(s)}$ are + 0.15 V and + 0.50 V respectively. The value of $E^o _{Cu^{2+}/Cu}$ will be :

answered Feb 11, 2020 by meena.clay6

1 answer

Which one of the following statement is not true ?

answered Feb 7, 2020 by sharmaaparna1

2 answers

Which one of the following statements is not true regarding (+) Lactose ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

Which one of the following is employed as Antihistamine ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

Clemmensen reduction of a ketone is carried out in the presence of which of the following ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

The correct IUPAC name of the compound

answered Feb 7, 2020 by sharmaaparna1

1 answer

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

answered Feb 7, 2020 by sharmaaparna1

1 answer

Which one is a nucleophilic substitution reaction among the following ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

Which one of the following is most reactive towards electrophilic reagent ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

What is the product obtained in the following reaction ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

Of the following which one is classified as polyester polymer ?

answered Feb 7, 2020 by sharmaaparna1

1 answer

The figure given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of IVI have been correctly identified ?

answered Feb 6, 2020 by meena.clay6

1 answer

What will you look for to identify the *** of the following ?

answered Feb 6, 2020 by priyanka.clay6

1 answer

Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception ?

answered Feb 6, 2020 by priyanka.clay6

1 answer

In which one of the following the genus name, its two characters and its class/phylum are correctly matched ?

answered Feb 6, 2020 by priyanka.clay6

1 answer

"Jaya" and "Ratna" developed for green revolution in India are the varieties of :

answered Feb 6, 2020 by priyanka.clay6

1 answer

Agarose extracted from sea weeds finds use in :

answered Feb 6, 2020 by priyanka.clay6

1 answer

In which one of the following pollination is autogamous ?

answered Feb 6, 2020 by priyanka.clay6

2 answers

Flowers are Zygomorphic in :

answered Feb 6, 2020 by priyanka.clay6

1 answer

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