Some Basic Concepts of Chemistry

An organic compound gives \(0.220 \mathrm{~g}\) of \(\mathrm{CO}_{2}\) and \(0.126 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) on complete combustion. If the \(\%\) of carbon is 24 then the \(\%\) of hydrogen is __________ $$\times 10^{-...

\(1 \mathrm{~g}\) of a carbonate \(\left(\mathrm{M}_{2} \mathrm{CO}_{3}\right)\) on treatment with excess \(\mathrm{HCl}\) produces \(0.01 \mathrm{~mol}\) of \(\mathrm{CO}_{2}\). The molar mass of \(\mathrm{M}_{2} \mathrm{CO}_{3}\) is _____...

A metal chloride contains \(55.0 \%\) of chlorine by weight . \(100 \mathrm{~mL}\) vapours of the metal chloride at STP weigh \(0.57 \mathrm{~g}\). The molecular formula of the metal chloride is
(Given: Atomic mass of chlorine is $$35.5 \ma...

A solution of sugar is obtained by mixing \(200 \mathrm{~g}\) of its \(25 \%\) solution and \(500 \mathrm{~g}\) of its \(40 \%\) solution (both by mass). The mass percentage of the resulting sugar solution is ___________ (Nearest integer)

The volume of hydrogen liberated at STP by treating \(2.4 \mathrm{~g}\) of magnesium with excess of hydrochloric acid is _________ \(\times ~10^{-2} \mathrm{~L}\)
Given : Molar volume of gas is \(22.4 \mathrm{~L}\) at STP.
Molar mass of mag...

A solution is prepared by adding \(2 \mathrm{~g}\) of "\(\mathrm{X}\)" to 1 mole of water. Mass percent of "\(\mathrm{X}\)" in the solution is :

The number of molecules and moles in 2.8375 litres of O\(_2\) at STP are respectively

Match List I with List II

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}
...

Given below are two statements: one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\)
Assertion A : \(3.1500 \mathrm{~g}\) of hydrated oxalic acid dissolved in water to make \(250.0 \mathrm{~mL}\) so...

Blister copper is produced by reaction of copper oxide with copper sulphide.
2Cu2O + Cu2S \(\to\) 6Cu + SO2
When 2.86 \(\times\) 103 g of Cu2O and 4.77 \(\times\) 103 g of Cu2S are used for reaction, the mass of copper produced is _________...

Production of iron in blast furnace follows the following equation
Fe3O4(s) + 4CO(g) \(\to\) 3Fe(l) + 4CO2(g)
when 4.640 kg of Fe3O4 and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is :
[Given : Molar Atomic ...

Using the rules for significant figures, the correct answer for the expression \({{0.02858 \times 0.112} \over {0.5702}}\) will be

\(\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})}\)
\(20 \mathrm{~g} \quad ~~~5 \mathrm{~g}\)
Consider the above reaction, the limiting reagent of the reaction and number of mole...

A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of \(\mathrm{H}_{2}\) gas at STP. The number of alcoholic hydrogens present in compound 'X' is ________.

$$
\begin{aligned}
&\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+400 \mathrm{~kJ} \\
&\mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})+100 \mat...

Consider the reaction
\(4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+3 \mathrm{KNO}_{3}(\mathrm{~s})\)
The amount of $$\mathrm{HN...

The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of CO2 and 0.442 g of H2O. The percentage of oxygen composition in the organic compound is ______________. (nearest integer)

Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is,
Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively.
The molar mass of the compound A is 162 g mol\(-\)1.

On complete combustion of \(0.492 \mathrm{~g}\) of an organic compound containing \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{O}\), \(0.7938 \mathrm{~g}\) of \(\mathrm{CO}_{2}\) and \(0.4428 \mathrm{~g}\) of \(\mathrm{H}_{2} \mathrm{O}\) was p...

In the given reaction,
\(X+Y+3 Z \leftrightarrows X YZ_{3}\)
if one mole of each of \(X\) and \(Y\) with \(0.05 \mathrm{~mol}\) of \(Z\) gives compound \(X Y Z_{3}\). (Given : Atomic masses of \(X, Y\) and \(Z\) are 10, 20 and 30 amu, respe...

2L of 0.2M H2SO4 is reacted with 2L of 0.1M NaOH solution, the molarity of the resulting product Na2SO4 in the solution is _________ millimolar. (Nearest integer)

Two elements A and B which form 0.15 moles of A2B and AB3 type compounds. If both A2B and AB3 weigh equally, then the atomic weight of A is _____________ times of atomic weight of B.

116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the followi...

\(20 \mathrm{~mL}\) of \(0.02 \,\mathrm{M} \,\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) solution is used for the titration of \(10 \mathrm{~mL}\) of \(\mathrm{Fe}^{2+}\) solution in the acidic medium.
The molarity of $$\mathrm{Fe}^{2+}...

In Carius method of estimation of halogen, \(0.45 \mathrm{~g}\) of an organic compound gave \(0.36 \mathrm{~g}\) of \(\mathrm{AgBr}\). Find out the percentage of bromine in the compound.
(Molar masses : $$\mathrm{AgBr}=188 \mathrm{~g} \math...

\(250 \mathrm{~g}\) solution of \(\mathrm{D}\)-glucose in water contains \(10.8 \%\) of carbon by weight. The molality of the solution is nearest to
(Given: Atomic Weights are, $$\mathrm{H}, 1 \,\mathrm{u} ; \mathrm{C}, 12 \,\mathrm{u} ; \m...

On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is _____________. (Nearest integer)

A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is:
(Atomic mass : Cl = 35.5 amu, H = 1 amu)

The moles of methane required to produce 81 g of water after complete combustion is _____________ \(\times\) 10\(-\)2 mol. [nearest integer]

CNG is an important transportation fuel. When 100 g CNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2 and H2O and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced...

When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x \(\times\) 10\(-\)2 M. (Nearest integer)
(Molar mass of n...

Chlorophyll extracted from the crushed green leaves was dissolved in water to make \(2 \mathrm{~L}\) solution of Mg of concentration \(48\, \mathrm{ppm}\). The number of atoms of \(\mathrm{Mg}\) in this solution is \(x \times 10^{20}\) atom...

A \(100 \mathrm{~mL}\) solution of \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}\) on treatment with methanol produces \(2.24 \mathrm{~mL}\) of a gas at STP. The weight of gas produced is _____________ mg. [nearest integer]

Hemoglobin contains \(0.34 \%\) of iron by mass. The number of Fe atoms in \(3.3 \mathrm{~g}\) of hemoglobin is
(Given: Atomic mass of Fe is \(56 \,\mathrm{u}, \mathrm{N}_{\mathrm{A}}=6.022 \times 10^{23} \mathrm{~mol}^{-1}\).)

Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is ___________ \(\times\) 10\(-\)2 g. (Atomic mass of Br = 80 g/mol) [Nearest Integer]

1 L aqueous solution of H2SO4 contains 0.02 m mol H2SO4. 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A), 0.01 m mol of H2SO4 are added. Total m mols of H2SO4 in the final solution is _________...

The number of N atoms in 681 g of C7H5N3O6 is x \(\times\) 1021. The value of x is (NA = 6.02 \(\times\) 1023 mol\(-\)1) (Nearest Integer)

A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is __________ \(\times\) 103 g mol\(-\)1 [nearest integer]

\(\mathrm{SO}_{2} \mathrm{Cl}_{2}\) on reaction with excess of water results into acidic mixture

\(\mathrm{SO}_{2} \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{HCl}\)

16 moles of $$\math...

A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is __________ g/mol. [Nearest...

56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.

A 0.166 g sample of an organic compound was digested with conc. H2SO4 and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N H2SO4. The used acid required 30.0 mL of 0.25 N NaOH for complete neutralization...

If a rocket runs on a fuel (C15H30) and liquid oxygen, the weight of oxygen required and CO2 released for every litre of fuel respectively are :
(Given : density of the fuel is 0.756 g/mL)

120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO2 and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are

The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4.2H2O) in 250 mL of water in mol L\(-\)1 is x \(\times\) 10\(-\)2. The value of x is _____________. (Nearest integer) [Atomic mass : H : 1.0, C : 12.0, O : 16.0...

Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is ______________ \(\times\) 10\(-\)1 M. (...

The density of NaOH solution is 1.2 g cm\(-\)3. The molality of this solution is _____________ m. (Round off to the Nearest Integer)[Use : Atomic mass : Na : 23.0 u, O : 16.0 u, H : 1.0 u, Density of H2O : 1.0 g cm\(-\)3]

2SO2(g) + O2(g) \(\to\) 2SO3(g)The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3 = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is ____...

In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr. The percentage of bromine in the compound is ______________. (Nearest integer)[Atomic mass : Ag = 108, Br = 80]

100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x \(\times\) 10\(-\)2. The value of x is ____________. (Nearest integer)[Atomic weight : H = 1.008; C = 12.00; O =...