Recent questions and answers in 2012

pH of a saturated solution of $Ba(OH)_2 $ is 12. The value of solubility product $(K_{SP}) of Ba(OH)_2$ is

answered Mar 30, 2020 by bharamagoudapatil11

2 answers

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

answered Mar 27, 2020 by rapoluakshitha

2 answers

Which one of the following is not a gaseous biogeochemical cycle in ecosystem

answered Mar 20, 2020 by e1.mehedihasan

2 answers

Sulphur trioxide can be obtained by which of the following reaction :

answered Feb 21, 2020 by meena.clay6

1 answer

Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is OPTION :

answered Feb 21, 2020 by meena.clay6

1 answer

Which of the following statements is false ?

answered Feb 21, 2020 by meena.clay6

1 answer

$CH_3CHO \;and\; C_6H_5CH_2CHO$ can be distinguised chemically by :

answered Feb 21, 2020 by meena.clay6

1 answer

Which of the following acids does not exhibit optical isomerism ?

answered Feb 21, 2020 by meena.clay6

1 answer

Predict the products in the given reaction OPTIONS :

answered Feb 21, 2020 by meena.clay6

1 answer

Which one of the following is not a condensation polymer ?

answered Feb 21, 2020 by meena.clay6

1 answer

In the following sequence of reactions $CH_3 - Br \xrightarrow{KCN} A \xrightarrow{H_3O^+} B \xrightarrow{LiAlH_4} C$ the end product (C) is :

answered Feb 21, 2020 by meena.clay6

1 answer

Which one of the following sets of monosaccharides forms sucrose ?

answered Feb 21, 2020 by meena.clay6

1 answer

Deficiency of vitamin $B_1$ causes the disease

answered Feb 21, 2020 by meena.clay6

1 answer

Among the following compounds the one that is most reactive towards electrophilic nitration is :

answered Feb 21, 2020 by meena.clay6

2 answers

Which nomenclature is not according to IUPAC system ?

answered Feb 21, 2020 by meena.clay6

1 answer

In the following reaction : The major product is :

answered Feb 21, 2020 by meena.clay6

1 answer

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is :

answered Feb 21, 2020 by meena.clay6

2 answers

Which one of the alkali metals, forms only, the normal oxide, $M_2O$ on heating in air ?

answered Feb 21, 2020 by meena.clay6

1 answer

The pair of species with the same bond order is

answered Feb 21, 2020 by meena.clay6

1 answer

Identify the alloy containing a non-metal as a constituent in it.

answered Feb 20, 2020 by meena.clay6

1 answer

Identity the wrong statement in the following

answered Feb 20, 2020 by meena.clay6

1 answer

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :

answered Feb 20, 2020 by meena.clay6

1 answer

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value ?:

answered Feb 19, 2020 by meena.clay6

1 answer

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order :

answered Feb 19, 2020 by meena.clay6

3 answers

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour :

answered Feb 19, 2020 by meena.clay6

1 answer

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?

answered Feb 19, 2020 by meena.clay6

1 answer

Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of :

answered Feb 19, 2020 by meena.clay6

1 answer

In which of the following compounds, nitrogen exhibits highest oxidation state ?

answered Feb 19, 2020 by meena.clay6

1 answer

The enthalpy of fusion of water is $1.435 \frac{kcal}{mol}$. The molar entropy change for the melting of ice at $0^{\circ}C$ is :

answered Feb 19, 2020 by meena.clay6

1 answer

A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

answered Feb 19, 2020 by meena.clay6

1 answer

The number of octahedral void(s) per atom present in a cubic close-packed structure is :

answered Feb 18, 2020 by meena.clay6

1 answer

Standard enthalpy of vapourisation $\bigtriangleup _{vap}H^{\ominus}$ for water at 100°C is $40.66 kJ mol^{-1}$. The internal energy of vaporisation of water at 100°C (in $kJmol^{-1}$) is :

answered Feb 18, 2020 by meena.clay6

1 answer

50 mL of each gas A and of gas B takes 150 and 200 seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be ?

answered Feb 18, 2020 by meena.clay6

1 answer

Maximum number of electrons in a subshell with l = 3 and n = 4 is :

answered Feb 18, 2020 by meena.clay6

2 answers

The protecting power of lyophilic colloidal sol is expressed in term of

answered Feb 18, 2020 by meena.clay6

1 answer

$P_A$ and $P_B$ are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If $X_A$ represents the mole fraction of component A, the total pressure of the solution will be:

answered Feb 18, 2020 by meena.clay6

1 answer

When $Cl_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from :

answered Feb 18, 2020 by meena.clay6

1 answer

In Freundlich Adsorption isotherm, the value of $\frac{1}{n}$ is :

answered Feb 18, 2020 by meena.clay6

1 answer

Buffer solutions have constant acidity and alkalinity because

answered Feb 18, 2020 by meena.clay6

1 answer

Limiting molar conductivity of $NH_4OH$ (i.e. $\Lambda^o_m (NH_4 OH))$ is equal to

answered Feb 18, 2020 by meena.clay6

2 answers

In a reaction, $A + B \rightarrow Product $, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as

answered Feb 18, 2020 by meena.clay6

1 answer

In which of the following reactions, standard reaction entropy change $(\Delta S°)$ is positive and standard gibb's energy change $(\Delta G°)$ decreases sharply with increasing temperature ?

answered Feb 18, 2020 by meena.clay6

1 answer

Which one of the following pairs is isostructural (i.e. having the same shape and hybridization) ?

answered Feb 17, 2020 by meena.clay6

1 answer

In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become:

answered Feb 17, 2020 by meena.clay6

1 answer

Which one of the following statements regarding photochemical smog is not correct ?:

answered Feb 12, 2020 by sharmaaparna1

1 answer

Which one of the following is a mineral of iron ?

answered Feb 11, 2020 by sharmaaparna1

1 answer

Which of the following statements is not valid for oxoacids of phosphorus ?

answered Feb 11, 2020 by sharmaaparna1

1 answer

Which of the statements is not true ?

answered Feb 11, 2020 by sharmaaparna1

1 answer

Monascus purpureus is a yeast used commercially in the production of :

asked Aug 20, 2018 by pady_1

1 answer

People who have migrated from the planes to an area adjoining Rohtang Pass about six months back :

asked Aug 20, 2018 by pady_1

1 answer

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