Recent questions in Chemistry

Which of the following is not tetrahedral ?

asked Oct 24, 2013 by meena.p

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The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

asked Oct 24, 2013 by meena.p

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Assertion (A): A catalyst increase the rate of a reaction. Reason (R): In presence of a catalyst, the activation energy of the reaction increases.

asked Oct 23, 2013 by meena.p

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Which of the following is an example of interstitial hydride?

asked Oct 23, 2013 by meena.p

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Which one of the following salts give an acidic solution in water?

asked Oct 23, 2013 by meena.p

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The following are some statement related to VA group hydrides,

asked Oct 23, 2013 by meena.p

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Which one of the following noble gases is used in miner's cap lamps ?

asked Oct 23, 2013 by meena.p

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The IUPAC name of the compound $(CH_3)_2 CH - CH = CH - CHOH -CH_3$ is

asked Oct 23, 2013 by meena.p

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Match the following:

asked Oct 23, 2013 by meena.p

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Hybridisation of oxygen in diethyl ether is

asked Oct 23, 2013 by meena.p

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\[CH_3 COOH \quad \underrightarrow {LiAlH_4} \quad A\] \[A +CH_3COOH \quad \underrightarrow {H_3O^{+}} \quad B+H_2O\] In the abive reactions 'A' and 'B' respectively are

asked Oct 23, 2013 by meena.p

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Which of the following is a biodegradable polymer?

asked Oct 23, 2013 by meena.p

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Which of the following statements is correct?

asked Oct 23, 2013 by meena.p

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138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

asked Oct 23, 2013 by meena.p

1 answer

The decreasing order of bond dissociation energies of C - C, C -H and H -H bound is

asked Oct 23, 2013 by meena.p

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The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\large\frac{16}{15 R}$$cm$. What is the value of $n_2 ? $ (R=Rydberg constant)

asked Oct 23, 2013 by meena.p

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$CaOCl_2+ H_2O \longrightarrow Ca(OH)_2+X;\;X+CH_3CHO \longrightarrow Y \; ; Y+ Ca(OH)_2 \longrightarrow CHCL_3.$ What is Y?

asked Oct 23, 2013 by meena.p

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The functional groups present in 'salol' are

asked Oct 23, 2013 by meena.p

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The solubility product, $K_{sp}\: of Ag_2\: CrO_4$ is $ 3.2 \times 10^{-11}\: at T(K)$ . Its solubility in mol $ L^{-1}$ is

asked Oct 23, 2013 by thanvigandhi_1

1 answer

Which of the following is not a conjugate acid- base pair?

asked Oct 23, 2013 by meena.p

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Assertion (A): Equal moles of different substance contain same number of constituent particles. Reason (R): Equal weights of different substances contain same number of constituent particles.

asked Oct 23, 2013 by meena.p

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The degree of dissociation of $N_2O_4$ in

asked Oct 23, 2013 by thanvigandhi_1

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The half life period of a first order radioactive decay of an element is 5 days. The time ( in days ) taken for 8 g of this element to decay to 1 g is

asked Oct 23, 2013 by thanvigandhi_1

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An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

asked Oct 23, 2013 by meena.p

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A radioactive substance $_{88} X ^{228}(IIIA)$ emits $3 \alpha$ and $3\; \beta$ particles to form "Y". To which group of long form of the periodic table does "Y" belong ?

asked Oct 23, 2013 by meena.p

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The distance in pico metres between centres of two closest sodium atoms in the body centred cubic lattice of sodium metal with a unit cell length of $4.3 \: A$ is

asked Oct 23, 2013 by thanvigandhi_1

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Cell constant of a conductivity cell is

asked Oct 23, 2013 by thanvigandhi_1

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Match the following

asked Oct 23, 2013 by thanvigandhi_1

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Calculate enthalpy for formation of ethylene from the following data

asked Oct 23, 2013 by meena.p

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$ \alpha - D(+)-\: and \: \beta -D\: (+)-$ glucopyranoses are known as

asked Oct 23, 2013 by thanvigandhi_1

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The structure of bakelite is

asked Oct 23, 2013 by thanvigandhi_1

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In the Hofmann mustard oil reaction of primary amines, the black precipitate is due to

asked Oct 23, 2013 by thanvigandhi_1

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Assertion (A); NaCl is less soluble in heavy water than in ordinary water. Reason (R) : Dielectric constant of ordinary water is more than that of heavy water.

asked Oct 23, 2013 by meena.p

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The chemical formula of feldspar is

asked Oct 23, 2013 by meena.p

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The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

asked Oct 23, 2013 by meena.p

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Which of the following pair of transition metal ions, have the same calculated values of magnetic moment?

asked Oct 23, 2013 by meena.p

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Identify 'B' in the following reaction : $CH_2 = CH_2+HCl \longrightarrow A+ 2[H] \longrightarrow B + HCl $

asked Oct 23, 2013 by meena.p

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In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is $2 \times 10^{-7}$ m and stopping potential is 2.5 V. The threshold frequency of the metal (in Hz) approximately (charge of electron $e=1.6 \times 10^{-19}C.$ Planck's constant $h= 6.6 \times 10^{34}\;J-s)$

asked Oct 23, 2013 by meena.p

1 answer

Hydrolysis of sucrose with dilute aqueous sulfuric acid yields

asked Oct 22, 2013 by meena.p

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If $\bar {M}_w$ is the weight - average molecular weight and $M_n$ is the number -average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

asked Oct 22, 2013 by meena.p

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The structure of the compound formed, when nitrobenzene is reduced by lithium aluminium hydride $(LiA / H_4)$ is

asked Oct 22, 2013 by meena.p

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Match the following:

asked Oct 21, 2013 by meena.p

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Identify $\underline A$ and $\underline B$ in the following reaction:

asked Oct 21, 2013 by meena.p

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Whar are A,B and C in the reaction?

asked Oct 21, 2013 by thanvigandhi_1

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Acetone on addition to methyl magnesium bromide forms a complex, which on decomposition with acid gives $\underline {X}$ and $Mg(OH)Br$. Which one of the following is $\underline X$?

asked Oct 21, 2013 by meena.p

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The IUPAC name of :

asked Oct 21, 2013 by meena.p

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The correct order of reactivity of hydrogen halides with ethyl alcohol is

asked Oct 21, 2013 by meena.p

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In which of the following reactions , chlorine acts as an oxidizing agent ?

asked Oct 21, 2013 by meena.p

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What are A and B ?

asked Oct 21, 2013 by thanvigandhi_1

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Identify the reagents A and B used in the following reactions

asked Oct 21, 2013 by thanvigandhi_1

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