Some Basic Concepts of Chemistry

An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with $\ce{Cl2}/h\nu$, (Y) gives only one monochlorinated product (Z). The total number of primary carbon atoms in (Y) is ________.

Match List - I with List - II.

Choose the correct answer from the options given below :

Given below are two statements :

Given : Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g mol$^{-1}$, respectively

Statement I : In 30% (w/w) solution of methanol in $\ce{CCl4}$ (at T K), the mole fraction of $\ce{CCl4}$ is equal to 0.33.

Statement II : Mixture of methanol and $\ce{CCl4}$ shows positive deviation from Raoult's law.

In the light of the above statements, choose the correct answer from the options given below :

Considering ideal gas behavior, the expansion work done (in kJ) when 144 g of water is electrolyzed completely under constant pressure at 300 K is _____.

Use: Universal gas constant (R) $= 8.3\ \mathrm{J\,K^{-1}\,mol^{-1}}$; Atomic mass (in amu): H = 1, O = 16

The solubility of barium iodate in an aqueous solution prepared by mixing 200 mL of 0.010 M barium nitrate with 100 mL of 0.10 M sodium iodate is $\boldsymbol{X}\times10^{-6}\ \mathrm{mol\,dm^{-3}}$. The value of $\boldsymbol{X}$ is _____.

Use: Solubility product constant ($K_{sp}$) of barium iodate $= 1.58\times10^{-9}$

Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from $10\ \mathrm{mg\,g^{-1}}$ and $16\ \mathrm{mg\,g^{-1}}$ aqueous phenol solutions, the concentrations of adsorbed phenol are measured to be $4\ \mathrm{mg\,g^{-1}}$ and $10\ \mathrm{mg\,g^{-1}}$, respectively. At this temperature, the concentration (in $\mathrm{mg\,g^{-1}}$) of adsorbed phenol from $20\ \mathrm{mg\,g^{-1}}$ aqueous solution of phenol will be _____.

Use: $\log_{10}2 = 0.3$

A linear octasaccharide (molar mass $= 1024\ \mathrm{g\,mol^{-1}}$) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is 58.26 % (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is _____.

Use: Molar mass (in $\mathrm{g\,mol^{-1}}$): ribose $= 150$, 2-deoxyribose $= 134$, glucose $= 180$; Atomic mass (in amu): H = 1, O = 16

To form a complete monolayer of acetic acid on 1 g of charcoal, 100 mL of 0.5 M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1 M NaOH solution was required. If each molecule of acetic acid occupies $\mathbf{P}\times10^{-23}\,\mathrm{m^2}$ surface area on charcoal, the value of P is _____.

[Use given data: Surface area of charcoal $= 1.5\times10^2\,\mathrm{m^2\,g^{-1}}$; Avogadro's number $(N_A) = 6.0\times10^{23}\,\mathrm{mol^{-1}}$]

The molecular weight of U is _____.

The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is _____.

[Use, molar mass ($\mathrm{g\,mol^{-1}}$): H = 1, C = 12, O = 16, Si = 28, Cl = 35.5]

The reaction of 4-methyloct-1-ene (P, 2.52 g) with HBr in the presence of $\ce{(C6H5CO)2O2}$ gives two isomeric bromides in a 9 : 1 ratio, with a combined yield of 50%. Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with aq. $\ce{K2CO3}$ to give a non-ionic product S in 100% yield.

The mass (in mg) of S obtained is _____.

[Use molar mass (in $\mathrm{g\,mol^{-1}}$): H = 1, C = 12, N = 14, Br = 80]

The treatment of an aqueous solution of 3.74 g of $\ce{Cu(NO3)2}$ with excess KI results in a brown solution along with the formation of a precipitate. Passing $\ce{H2S}$ through this brown solution gives another precipitate X. The amount of X (in g) is _____.

[Given: Atomic mass of H = 1, N = 14, O = 16, S = 32, K = 39, Cu = 63, I = 127]

Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas Q. The amount of $\ce{CuSO4}$ (in g) required to completely consume the gas Q is _____.

[Given: Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]

If the reaction sequence given below is carried out with 15 moles of acetylene, the amount of the product D formed (in g) is _____.

The yields of A, B, C and D are given in parentheses.
[Given: Atomic mass of H = 1, C = 12, O = 16, Cl = 35]

To check the principle of multiple proportions, a series of pure binary compounds $(\mathrm{P_mQ_n})$ were analyzed and their composition is tabulated below. The correct option(s) is(are)

Compound	Weight % of P	Weight % of Q
1	50	50
2	44.4	55.6
3	40	60

If a rocket runs on a fuel ($\mathrm{C_{15}H_{30}}$) and liquid oxygen, the weight of oxygen required and $\mathrm{CO_2}$ released for every litre of fuel respectively are :

(Given : density of the fuel is 0.756 g/mL)

A 0.166 g sample of an organic compound was digested with conc. $\mathrm{H_2SO_4}$ and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N $\mathrm{H_2SO_4}$. The used acid required 30.0 mL of 0.25 N NaOH for complete neutralization. The mass percentage of nitrogen in the organic compound is ______.

120 g of an organic compound that contains only carbon and hydrogen gives 330 g of $\mathrm{CO_2}$ and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are

When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of acetic acid adsorbed per gram of carbon is ______ g.

The number of N atoms in 681 g of $\mathrm{C_7H_5N_3O_6}$ is $x\times10^{21}$. The value of $x$ is ______.

($N_A=6.02\times10^{23}\ \mathrm{mol^{-1}}$) (Nearest Integer)