Recent questions tagged chemistry

Two gases of molecular masses $ M_A\: and \: M_B$ are at temperatures $T_A\: and \:T_B$ respectively. If $T_AM_B=T_BM_A$ , which one of the following properties has the same value for both the gases?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Electrons with a kinetic energy of $6.023 \times 10^4 \;j/mol$ are evolved from a surface of a metal , when it is exposed to radiation of wavelength of $600\;nm$. The minimum amount of energy required to removed an electron from the metal atom is:

asked Oct 14, 2013 by meena.p

1 answer

Consider the following statements for the reaction

asked Oct 14, 2013 by thanvigandhi_1

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The total number of antibonding electrons in $N_2\: and \: O_2$ molecules respectively is :

asked Oct 14, 2013 by thanvigandhi_1

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Which one of the following sets correctly represent the increase in the paramagnetic property of the ions?

asked Oct 14, 2013 by meena.p

1 answer

The number of $ \sigma\: and \: \pi$ bonds present in acetylene are respectively

asked Oct 14, 2013 by thanvigandhi_1

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The wave lengths of electron waves in two orbits is $3:5$ The ratio of kinetic energy of electrons will be :

asked Oct 14, 2013 by meena.p

1 answer

The correct order of atomic radius of $Li, Be\: and \: B $ is

asked Oct 14, 2013 by thanvigandhi_1

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The number of $p \pi-d \pi $ 'pi' bonds present in $XeO_3$ and $XeO_4$ molecules, respectively:

asked Oct 14, 2013 by meena.p

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If the uncertainty in velocity of a moving object is $ 1.0 \times 10^{-6}\: ms^{-1}$ and the uncertainty in its position is 58 m, the mass of this object is approximately equal to that of : $ (h=6.626 \times 10^{-34}js)$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

One mole of alkene $\underline {X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{X}$ is :

asked Oct 14, 2013 by meena.p

1 answer

The energy required to overcome the attractive forces on the electrons, w, of some metals is listed below . The number of metals showing photoelectric effect when light of 300 nm wavelength falls on it is :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Sodium thiosulphate reacts with $dil\: HCI$ to form $NaCI,H_2O, \underline X\: and \: \underline Y.\: \underline X$ reacts with $Na_2S$ to form $Na_2S_2O_3$ and $ \underline Y$ . Which one of the following is $ \underline Y$.

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Assertion (A) : $GeF_4$ and $SiCI_4$ act as Lewis bases. Reasons (R) : $Ge$ and $Si$ have d-orbitals to accept electrons.

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

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Orange red coloured monoxide is :

asked Oct 14, 2013 by thanvigandhi_1

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Zinc reacts with hot and concentrated NaOH and forms :

asked Oct 14, 2013 by thanvigandhi_1

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In which of the following reactions $ H_2O_2$ acts as oxidizing agent?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

In the reaction

asked Oct 14, 2013 by thanvigandhi_1

1 answer

If the solubility product of $MgF_2$ at a certain temperature is $ 1.08 \times 10^{-10}$ , its solubility in mol $1^{-1}$ is:

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Fluorine reacts with dilute $NaOH$ and forms a gaseous and forms a gaseous product $\underline{A}$. The bond angle in the molecule of $\underline{A}$ is :

asked Oct 14, 2013 by meena.p

1 answer

Identify the alkyne in the following sequence of reactions:

asked Oct 14, 2013 by meena.p

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For the equilibrium $A_{(g)} \rightleftharpoons B_{(g)}+C_{(g)} ;K_p=0.82 atm$ at $27^{\circ}C$. At the same temperature its $K_c$ in mol $lit^{-1}$ is : ( R=0.082 lit atm $mol^{-1}K^{-1}$)

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Given that $\Delta H_f(H)=218 kJ/mol,$ express the $H-H$ bond energy in Kcal/mol:

asked Oct 14, 2013 by meena.p

1 answer

Fluorine reactes with $ KHSO_4$ to form HF and $ \underline X$. Which one of the following is $ \underline X$?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Identify the correct set

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

During the manufacture of cast iron, the slag ($ CaSiO_3$) is formed in

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Match the following :

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Carbon and Hydrogen in an organic compound are detected as

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following causes cancer?

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following ischloropicrin?

asked Oct 13, 2013 by thanvigandhi_1

0 answers

The pair of chemicals used as food for yeast in the fermentation of molasses is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

The order of basic strength of $C_6H_5NH_2$ (1), $C_2H_5NH_2$ (2), $(C_2H_5)_2NH $ (3) and $NH_3$ (4) is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Identify the pair of condensation polymers from the following :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following statements is correct?

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Identify the non-narcotic analgesic from the following:

asked Oct 2, 2013 by meena.p

1 answer

The $AT/GC$ ratio in human beings is :

asked Oct 2, 2013 by meena.p

1 answer

If the number average molecular weight and weight average molecular weight of a polymer are $40,000$ and $60,000$ respectively, the polydispersity index of the polymer will be :

asked Oct 2, 2013 by meena.p

1 answer

Reduction of nitrobenzene with $Z_n$ and alcoholic $KOH$ solution results in the formation of the following compound:

asked Oct 2, 2013 by meena.p

1 answer

Identify $A,B$ and $C$ in the following reactions :

asked Oct 2, 2013 by meena.p

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Which one of the following gives yellow precipitate with iodine and $NaOH$ solution ?

asked Oct 2, 2013 by meena.p

1 answer

Identify the product (A) of the following reaction :

asked Oct 2, 2013 by meena.p

1 answer

The two enantiomers of secondary butyl chloride differ from each other in which one of the following properties?

asked Oct 2, 2013 by meena.p

1 answer

Which one of the following pairs of 2,3- butane diol is enantiomeric?

asked Oct 2, 2013 by meena.p

1 answer

In which of the following, ortho/para substitution by an electrophile is very facile?

asked Oct 2, 2013 by meena.p

1 answer

Diels- Alder reaction will not take place with which of the following reactants?

asked Oct 2, 2013 by meena.p

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The conservation of O-acylated phenol in presence of $AlCl_3$ to $C-$acylated pheno is an example for this type of organic reaction:

asked Oct 2, 2013 by meena.p

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The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is :

asked Oct 2, 2013 by meena.p

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