Recent questions tagged 2015

If Avogadro number NA, is changed from $6.022 \times 10^{23} mol^{–1}$ to $6.022 \times 10^{20} \;mol^{–1}$, this would change :

asked Aug 21, 2018 by pady_1

1 answer

The name of complex ion, $[Fe(CN)_6]^{3–}$ is :

asked Aug 21, 2018 by pady_1

1 answer

Which of the statements given below is incorrect ?

asked Aug 21, 2018 by pady_1

0 answers

The vacant space in bcc lattice unit cell is :

asked Aug 21, 2018 by pady_1

1 answer

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

asked Aug 21, 2018 by pady_1

1 answer

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified $KMnO_4$ for complete oxidation?

asked Aug 21, 2018 by pady_1

2 answers

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule, to give a product 1-chloro-1- methylcyclohexane. The possible alkene is :

asked Aug 21, 2018 by pady_1

1 answer

In which of the following pairs, both the species are not isostructural ?

asked Aug 21, 2018 by pady_1

1 answer

The number of water molecules is maximum in :

asked Aug 21, 2018 by pady_1

1 answer

Decreasing order of stability of $O_2, O_2^-, O_2^+$ and $O_2^{2-}$ is :

asked Aug 21, 2018 by pady_1

1 answer

Strong reducing behaviour of $H_3PO_2$ is due to :

asked Aug 21, 2018 by pady_1

1 answer

On heating which of the following releases $CO_2$ most easily ?

asked Aug 21, 2018 by pady_1

1 answer

Caprolactam is used for the manufacuture of :

asked Aug 21, 2018 by pady_1

1 answer

Aqueous solution of which of the following compounds is the best conductor of electric current ?

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following pairs of solution is not an acidic buffer ?

asked Aug 21, 2018 by pady_1

1 answer

If the equilibrium constant for $N_2 (g) + O_2(g) \leftrightharpoons 2NO (g) $ is $K$, the equilibrium constant for $\frac{1}{2} N_2(g) + \frac{1}{2}O_2 (g) \leftrightharpoons NO (g) $ will be :

asked Aug 21, 2018 by pady_1

1 answer

The number of structural isomers possible from the molecular formula $C_3H_9N$ is

asked Aug 21, 2018 by pady_1

1 answer

The formation of the oxide ion, $O^{2–}$ (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below : $O(g) + e^- \to O^- (g), \Delta_f H^{\ominus} = -141 kJ\;mol^{-1}$ $O^-(g) + e^- \to O^{2-} (g), \Delta_f H^{\ominus} = +780 kJ\;mol^{-1}$ Thus process of formation of $O^{2–}$ in gas phase is unfavourable even though $O^{2–}$ is isoelectronic with neon. It is due to the fact that :

asked Aug 21, 2018 by pady_1

1 answer

Gadolinium belongs to 4f series. It's atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

asked Aug 21, 2018 by pady_1

1 answer

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

asked Aug 21, 2018 by pady_1

1 answer

From the following statements regarding $H_2O_2$ , choose the incorrect statement :

asked Nov 18, 2015 by meena.p

1 answer

The following reaction is performed at $298\;K$

asked Nov 18, 2015 by meena.p

1 answer

Which polymer is used in the manufacture of paints and lacquers ?

asked Nov 18, 2015 by meena.p

1 answer

Which one has the highest boiling point ?

asked Nov 18, 2015 by meena.p

1 answer

Assertion : Nitrogen and Oxygen are the main component in the atmosphere but these but these do not react to form oxides of nitrogen . Reason : The reaction between nitrogen and Oxygen requires high temperature .

asked Nov 18, 2015 by meena.p

1 answer

The standard Gibbs energy changes at 300 k for the reaction $2A= B+C$ is $2494.2\;J$ At a given time, the composition of the reaction mixture is $[A]=\large\frac{1}{2}$$,[B] =24$ and $[C]=\frac{1}{2} $. The reaction proceeds in the : $[R= 8.314\;J/K/mol,e = 2.718]$

asked Nov 18, 2015 by meena.p

1 answer

Which among the following

asked Nov 18, 2015 by meena.p

1 answer

The Vapour pressure of acetone at $20^{\circ}C$ is $185\;torr$.When $1.2 \;g$ of a non- volatile substance was dissolved in 100 g of acetone at $20^{\circ}$its vapour pressure was $183$ torr. The molar mass $(g mol^{-1}) of the substance is :

asked Nov 18, 2015 by meena.p

1 answer

3g of activated charcoal was added to 50 mL of acetic acid solution $(0.06\;N)$ in a flask. After an hour it was filtered was found to be $0.042\;N$ . The amount of acetic acid absorbed (per gram of charcoal ) is :

asked Nov 18, 2015 by meena.p

1 answer

The synthesis of alkyl fluorides is best accomplished by :

asked Nov 18, 2015 by meena.p

1 answer

The color of $kMnO_4$ is due to

asked Nov 18, 2015 by meena.p

1 answer

In Carius method of estimation of halogens, $250\;mg$ of an organic compound gave $141\;mg$ of $AgBr$. The percentage of bromine in the compound is

asked Nov 18, 2015 by meena.p

1 answer

The number of geometric isomers that can exist for square planar $[Pt(Cl)(py)(NH_3)(NH_2OH)] +$ (py= pyridine ):

asked Nov 17, 2015 by meena.p

1 answer

Two Faraday of electricity is passed through a solution of $CuSO_4$ . The mass of copper deposited at the cathode is : (at . mass of Cu=63.5 amu)

asked Nov 17, 2015 by meena.p

1 answer

The molecular formula of a commercial resin used for exchanging ions in water softening is $C_8H_7SO_3Na$ (Mol.wt.206) What would be the maximum uptake of $Ca^{2+}$ ions by the resin when expressed in mole per gram resin ?

asked Nov 17, 2015 by meena.p

1 answer

The inter molecular interaction that is dependent on the inverse cube of distance between the molecules is :

asked Nov 17, 2015 by meena.p

1 answer

Match the catalysts to the correct processes :

asked Nov 17, 2015 by meena.p

1 answer

Which of the following compounds will exhibit geometrical isomerism?

asked Nov 17, 2015 by meena.p

1 answer

Higher order $(>3)$ reactions are rare due to :

asked Nov 17, 2015 by meena.p

1 answer

In the following sequence of reaction :

asked Nov 17, 2015 by meena.p

1 answer

In the context of the Hall- Heroult process for the extraction of $Al$ which of the following statement is false ?

asked Nov 17, 2015 by meena.p

1 answer

The ionic radii (in A) of $N^{3-},O^{2-}$ and $F^{-}$ are respectively :

asked Nov 17, 2015 by meena.p

1 answer

Which of the following compounds is not an antacid ?

asked Nov 17, 2015 by meena.p

1 answer

Which of the following is the energy of a possible excited state of hydrogen ?

asked Nov 17, 2015 by meena.p

1 answer

Which of the following compounds is not colored yellow ?

asked Nov 17, 2015 by meena.p

1 answer

Sodium metal crystallizes in a body centered cubic lattice with a unit cell edge of $44.29 \dot{A}$ the radius of sodium atom is approximately :

asked Nov 17, 2015 by meena.p

1 answer

In the reaction

asked Nov 17, 2015 by meena.p

1 answer

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?

asked Nov 17, 2015 by meena.p

1 answer

Which of the vitamins given below is water soluble ?

asked Nov 17, 2015 by meena.p

1 answer

Which compound would give 5 -keto-2-methyl hexanal upon ozonolysis ?

asked Nov 17, 2015 by meena.p

1 answer

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