Recent questions tagged chemistry

Which of the following statement are correct?

asked Sep 25, 2013 by meena.p

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The gases evolved in the decomposition of lead nitrate are:

asked Sep 25, 2013 by meena.p

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What is the empirical formula of sheet silicates ?

asked Sep 25, 2013 by meena.p

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The relative of $Ca,Sr,Mg$ and $Ba$ with water follow the order:

asked Sep 25, 2013 by meena.p

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Calcium carbide is hydrolyzed using heavy water. What are the products formed?

asked Sep 25, 2013 by meena.p

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According to Langmuir adsorption isotherm, the amount of gas absorbed by unit surface area is : (a,b,,k and n are constants; P=pressure of gas)

asked Sep 25, 2013 by meena.p

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Which one of the following pairs represents the intensive properties ?

asked Sep 25, 2013 by meena.p

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The order of $pH$ of $0.200\;M$ solutions of $NH_4NO_3,Na_2CO_3$ is:

asked Sep 25, 2013 by meena.p

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At $T(k),$ the partial pressures of $SO_2,O_2$ and $SO_3$ are $0.662,0.100$ and $0.331$ atm. respectively for the reaction $ 2 S0_2+O_2 \to 2 SO_3$ at equilibrium . What is the partial pressure in atm. of $O_2$ when the equilibrium partial pressures of $SO_2$ and $SO_3$ are equal at the same temperature?

asked Sep 25, 2013 by meena.p

1 answer

Match the following:

asked Sep 25, 2013 by meena.p

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In electro chemical corrosion, the metal undergoing corrosion :

asked Sep 25, 2013 by meena.p

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If the length of the unit cell is 5 A, the smallest distance in A between the two neighboring metal atoms in a face center cubic lattice is :

asked Sep 25, 2013 by meena.p

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For the electro chemical cell $ M | M^{+} || X^{-} | X, E^{0}(M^{+} | M)=0.44\;V$ and $E^{0} (X | X ^{-})=0.33\;V.$ Which one of the following is true for this data?

asked Sep 25, 2013 by meena.p

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A solution of 10 g of non-volatile binary electrolyte (mol wt=100) in 500 g of water freezes at $-0.74^{\circ}C$. What is the degree of ionisation ? ($k_f$ of water$=1.85\;K \; molality^{-1})$

asked Sep 25, 2013 by meena.p

1 answer

In acidic medium, $100\; ml$ of $0.01\;M\;KMnO_4$ solution oxides $100\;ml$ of $H_2O_2$ solution. The volume of $0.01\;M\;KMnO_4$ required to oxidize the same volume of $H_2O_2$ in alkaline medium in ml. is :

asked Sep 25, 2013 by meena.p

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Which one of the following statement is not correct?

asked Sep 25, 2013 by meena.p

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A metal nitride contains $28 \%$ nitrogen by weight. The molecular formula of metal nitride is $M_3N_2$. What is the atomic weight of metal?

asked Sep 24, 2013 by meena.p

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Identify Phenacetin from the following :

asked Sep 19, 2013 by meena.p

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The number of hydrogen bonds between Guanine & Cytosine; and between Adenine & Thymine in DNA is :

asked Sep 19, 2013 by meena.p

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Example of a biodegradable polymer pair is :

asked Sep 19, 2013 by meena.p

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Identify $X$and $Y$ in the following reactions:

asked Sep 19, 2013 by meena.p

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The $pK_a$ values of four carboxylic acids are given below. Identify the weakest carboxylic acid.

asked Sep 19, 2013 by meena.p

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The structure of PCC is :

asked Sep 19, 2013 by meena.p

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The product formed in the reaction of phenol with $Br_2$ dissolved in $CS_2$ at $0^{\circ}$ are :

asked Sep 19, 2013 by meena.p

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Heating chloroform with aqueous sodium hydroxide solution forms:

asked Sep 19, 2013 by meena.p

2 answers

In which of the following properties, the two enantiomers of lactic acid differ from each other?

asked Sep 19, 2013 by meena.p

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Assertion (A): $-NH_2$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) : $-NH_2$ group stabilizes the arenium ion formed by the ortho, para attack of the electrophile.

asked Sep 19, 2013 by meena.p

1 answer

$C_2H_6 \to C_2H_4+H_2$ above reaction is called as ___________ .

asked Sep 19, 2013 by meena.p

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Which one of the following gives Prussion blue colour?

asked Sep 19, 2013 by meena.p

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Cataract and skin cancer are caused by _________ .

asked Sep 19, 2013 by meena.p

2 answers

Which of the following is not added during the extraction of silver by cyanide process?

asked Sep 19, 2013 by meena.p

1 answer

A compound absorbs light in the wavelength region 490-500 nm. Its complementary colour is:

asked Sep 19, 2013 by meena.p

1 answer

Liquid $\underline{X}$ is used in Bubble chamber to detect neutral mesons and gamma photons. Then ,$\underline{X}= \underline{X}$

asked Sep 19, 2013 by meena.p

1 answer

The role of copper diaphragm in Whytlaw-Gray's method is :

asked Sep 19, 2013 by meena.p

1 answer

$Na_2S_2O_3$ reacts with moist $Cl_2$ to from $Na_2SO_4,HCl$ and $\underline{X}.$ Which one of the following is $\underline{X}$?

asked Sep 19, 2013 by meena.p

1 answer

Which one of the following is not correct?

asked Sep 19, 2013 by meena.p

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How many corner's of $SiO_4$ unit are shared in the formation of three dimensional silicates?

asked Sep 19, 2013 by meena.p

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Diborane reacts with HCl in the presence of $AlCl_3$ and liberates:

asked Sep 19, 2013 by meena.p

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Solution "X" contains $Na_2 CO_3$ and $NaHCO_3.\;20 \;ml$ of $X$ when titrated using methyl orange indicator consumed $60\; ml $ of $0.1\;M\;HCl$ solution. In another experiment, $20 \;ml$ of X solution when titrated using phenolphthalein consumed $20\;ml$ of $0.1\;M\;HCl$ solution. The concentration (in mol $lit^{-1}$) of $Na_2CO_3$ and $NaHCO_3$ in X are respectively.

asked Sep 19, 2013 by meena.p

1 answer

Observe the following statements:

asked Sep 19, 2013 by meena.p

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Match the following

asked Sep 19, 2013 by meena.p

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For which one of the following reactions,the entropy change is positive?

asked Sep 19, 2013 by meena.p

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The $pH$ of a buffer solution made by mixing $25\;ml$ of $\;0.02\;M\;NH_4OH$ and $25\;ml$ of $\;0.2\;M\;NH_4Cl$ at $25^{\circ}C$ is : $(pK_b\;of\;NH_4OH=4.8)$

asked Sep 19, 2013 by meena.p

1 answer

The degree of ionization of $\;0.10\;M$ lactic acid is $4.0 \%$

asked Sep 19, 2013 by meena.p

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Which one of the following plots is correct for a first reaction?

asked Sep 19, 2013 by meena.p

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The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed (hcp) crystal of 'X' atoms are :

asked Sep 19, 2013 by meena.p

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The extent of charge of lead accumulator is determined by

asked Sep 19, 2013 by meena.p

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During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is :

asked Sep 19, 2013 by meena.p

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The vapour pressure in mm of $Hg,$ of an aqueous solution obtained by adding 18 g of glucose $(C_6H_{12}O_6)$ to $180\;g$ of water at $100^{\circ}$ is :

asked Sep 18, 2013 by meena.p

1 answer

Which one of the following is an isotonic pair of solutions?

asked Sep 18, 2013 by meena.p

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