Recent questions in Chemistry

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

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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

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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

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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

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Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

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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

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Which one of the following statements is correct?

asked Oct 13, 2013 by thanvigandhi_1

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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

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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

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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

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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

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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

1 answer

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

1 answer

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

asked Oct 2, 2013 by meena.p

1 answer

The chemical reaction that involves roasting process is :

asked Oct 2, 2013 by meena.p

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Which of the following is a current statement?

asked Oct 2, 2013 by meena.p

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Helium mixed with oxygen is used in the treatment of :

asked Oct 2, 2013 by meena.p

1 answer

Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide ?

asked Oct 2, 2013 by meena.p

1 answer

Which one pf the following is most acidic?

asked Oct 1, 2013 by meena.p

1 answer

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is :

asked Oct 1, 2013 by meena.p

0 answers

Which one of the following is the mineral for tin ?

asked Oct 1, 2013 by meena.p

1 answer

Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions ?

asked Oct 1, 2013 by meena.p

1 answer

Solvay process is used in the manufacture of :

asked Oct 1, 2013 by meena.p

1 answer

The orange coloured compound formed when $H_2O_2$ is added to $TiO_2$ solution acidified with conc. $H_2SO_4$ is :

asked Oct 1, 2013 by meena.p

1 answer

A micelle formed during the cleansing action by the soap is :

asked Oct 1, 2013 by meena.p

1 answer

A system is provided with 50 Joules of heat and the work done on the system is 10 Joules. What is the change in internal energy of the system in Joules?

asked Oct 1, 2013 by meena.p

1 answer

The $pH$ of $0.01\;M$ solution of acetic acid is $5.0$. What are the values of $[H^{+}]$ and $K_{\alpha}$ respectively ?

asked Oct 1, 2013 by meena.p

1 answer

If the equilibrium constant for the reaction $H_{2(g)}+I_{2(g)} \rightleftharpoons 2 HI_{(g)}$ is $K $ What is the equilibrium constant of $HI_{(g)} \rightleftharpoons \large\frac{1}{2} $$H_{2(g)}+\large\frac{1}{2} $$I_{2(g)}$?

asked Oct 1, 2013 by meena.p

1 answer

What is the slope of the straight line for the graph drawn between ln $k$ and $\large\frac{1}{T}$, where $k$ is the rate constant of a reaction at temperature T?

asked Oct 1, 2013 by meena.p

1 answer

Assertion (A) : White tin is an example of tetragonal system. Reasoning (R): For a tetragonal system $a=b=c$ and $\alpha =\beta = \gamma \neq 90^{\circ}$. The correct answer is :

asked Oct 1, 2013 by meena.p

1 answer

A solution of concentration 'C' g equiv/ litre has a specific resistance R. The equivalent conductance of the solution is :

asked Oct 1, 2013 by meena.p

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At a certain temperature and at infinite dilution, the equivalent conductance of sodium benzoate, hydrochloric acid and sodium chloride are 240,349 and 229 $ohm^{-1} cm^2 equiv^{-1}$ respectively. The equivalent conductance of benzoic acid in $ohm^ {-1}\;cm^2\;equiv^{-1}$ at the same conditions is :

asked Oct 1, 2013 by meena.p

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X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X and Y :

asked Oct 1, 2013 by meena.p

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If $BaCl_2$ ionizes to an extent of $80 \%$ in aqueous solution, the value of Van't Hoff factor is :

asked Oct 1, 2013 by meena.p

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