Recent questions tagged chemistry

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

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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 atomic composition of the entire universe is approximately given in the table below

asked Oct 23, 2013 by sreemathi.v

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The chemical formula of feldspar is

asked Oct 23, 2013 by meena.p

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A gas mixture contains 50% helium and 50% methane by volume .What is the percentage by mass of methane in the mixture

asked Oct 23, 2013 by sreemathi.v

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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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On analysis of an impure sample of sodium chloride,the percentage of chloride was found to be 45.5.What is the percentage of pure sodium chloride in the given sample ?

asked Oct 23, 2013 by sreemathi.v

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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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Hydrogen and oxygen are combined in the ratio 1 : 16 by mass in hydrogen peroxide.Calculate the percentage of hydrogen and oxygen in hydrogen peroxide.

asked Oct 23, 2013 by sreemathi.v

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Calculate the percentage of nitrogen present in the composition of calcium nitrate.

asked Oct 23, 2013 by sreemathi.v

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The oxide of an element contains 32.33 percent of the element and the vapor density of its chloride is 79.Calculate the atomic mass of the element.

asked Oct 23, 2013 by sreemathi.v

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One gram of a chloride was found to contain 0.835g of chlorine.Its vapor density is 85.Calculate its molecular formula

asked Oct 23, 2013 by sreemathi.v

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On dissolving 2.0g of metal in sulphuric acid 4.51g of the metal sulphate was formed.The specific heat of the metal is 0.057cal/g.What is the exact atomic mass of the metal?

asked Oct 23, 2013 by sreemathi.v

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A chloride of an element contains 49.5% chlorine.The specific heat of the element is $0.056$.Calcuate the equivalent mass,valency.

asked Oct 23, 2013 by sreemathi.v

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The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

asked Oct 23, 2013 by sreemathi.v

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The percentage of an element $m$ is 53 in its oxide of molecular formula $M_2O_3$.Its atomic mass is about

asked Oct 23, 2013 by sreemathi.v

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A metal m of equivalent mass E forms an oxide of molecular formula $M_xO_y$ .The atomic mass of the metal is given by the correct equation.

asked Oct 23, 2013 by sreemathi.v

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How many years it would take to spend one Avogadro's number of rupees at a rate of 10lakh of rupees in one second

asked Oct 23, 2013 by sreemathi.v

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The electric charge on the electron is $1.602\times 10^{-19}$ coulomb.How much charge is present on 0.1 mole of $Cu^{2+}$ ions?

asked Oct 23, 2013 by sreemathi.v

1 answer

How many electrons are present in 1.6g of methane?

asked Oct 23, 2013 by sreemathi.v

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How many molecules of atoms of oxygen are present in 5.6 litres of oxygen $(O_2)$ at NTP?

asked Oct 23, 2013 by sreemathi.v

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From 200mg of $CO_2,10^{21}$ molecules are removed.How many moles of $CO_2$ are left?

asked Oct 22, 2013 by sreemathi.v

1 answer

What is the mass of $3.01\times 10^{22}$ molecules of ammonia?

asked Oct 22, 2013 by sreemathi.v

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How many molecules of water and oxygen atoms are present in 0.9g of water?

asked Oct 22, 2013 by sreemathi.v

1 answer

Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

asked Oct 22, 2013 by sreemathi.v

2 answers

A gas has a vapour density 11.2. The volume occupied by 1g of the gas at NTP is

asked Oct 22, 2013 by sreemathi.v

1 answer

116 mg of a compound on vaporization in Victor mayer's apparatus displaces 44.8 ml of air measured at STP.The molecular mass of the compound is

asked Oct 22, 2013 by sreemathi.v

1 answer

Which has the maximum number of atom

asked Oct 22, 2013 by sreemathi.v

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Which of the following two oxide of nitrogen have 30.5% nitrogen

asked Oct 22, 2013 by sreemathi.v

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Which of the following alkanes has 75% of carbon?

asked Oct 22, 2013 by sreemathi.v

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Which pair of species has same percentage of carbon?

asked Oct 22, 2013 by sreemathi.v

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It is found that 16.5g of metal combine with oxygen to form 35.6g of metal oxide.Calculate the percentage of metal and oxygen in the compound.

asked Oct 22, 2013 by sreemathi.v

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An unknown element forms an oxide.What will be the equivalent mass of the element if the oxygen content is 20% by mass ?

asked Oct 22, 2013 by sreemathi.v

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A piece of copper weighs $0.635g.$How many atoms of copper does it contain?

asked Oct 22, 2013 by sreemathi.v

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