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JEE Some Basic Concepts of Chemistry PYQs with Solutions

60 previous year questions from Some Basic Concepts of Chemistry (JEE Main & Advanced NSEC) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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About Some Basic Concepts of Chemistry PYQs

Some Basic Concepts of Chemistry has 60 previous year questions in the Quantrex Academy JEE Main & Advanced NSEC bank. The 60 questions in this list come from Olympiad workbook (60). Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE Some Basic Concepts of Chemistry PYQs with Solutions

About Some Basic Concepts of Chemistry PYQs

Some Basic Concepts of Chemistry questions with solutions

Among the following, number of oxygen atoms present is the maximum in

Which of the following mixtures of water and H_2 SO_4 would have mass percentage of H_2 SO_4 close to 30 ?

A 500 mL glass flask is filled at 298 K and 1 atm . pressure with three diatomic gases X, Y and Z . The initial volume ratio of the gases before mixing was 5: 3: 1 . The density

Lithium oxide ( Li_2 O ; molar mass =30 ~g ~mol^ -1 ) is used in space shuttles to remove water vapour according to the following reaction Li_2 O_ (s) +H_2 O(~g) arrow 2 LiOH_ (s)

Battery acid (H_2 SO_4) has density 1.285 ~g ~cm^ -3 · 10.0 ~cm^3 of this acid is diluted to 1 ~L . 25 .0 ~cm^3 of this diluted solution requires 25.0 ~cm^3 of 0.1 N sodium

Which one of the following statements is not correct about glucose? (. molar mass of glucose .=180 ~g ~mol^ -1 )

1.250 g of metal carbonate (MCO_3) was treated with 500 mL of 0.1 M HCl solution. The unreacted HCl required 50.0 mL of 0.500 M NaOH solution for neutralization. Identify the

Radius of Ar atom is 145 pm . The percentage volume occupied by an Ar atom at STP is

'Iodine number' is the grams of iodine atoms (atomic mass =127 ~g ~mol^ -1 ) that can react completely with100 g of a vegetable oil. Iodine monochloride (ICl) is a reagent used to

Compound ' Y ' (molar mass =88.12 ~g ~mol^ -1 ) containing 54.52 \% carbon, 9.17 \% hydrogen and 36.31 \% oxygen gives a reddish-brown precipitate in Fehling's test. ' Y ' is

Myoglobin, (Mb), an oxygen storage protein, contains 0.34 \% Fe by mass and in each molecule of myoglobin one ion of Fe is present. Molar mass of Mb (g mol^ -1 ) is (. Molar mass

Penicillamine is used in the treatment of arthritis. One molecule of penicillamine contains a single sulphur atom and the weight percentage of sulphur in penicillamine is 21.49 \%

Which of the following statement/s is/are correct? I. Number of significant figures in 2345.100 is three II. 0.00787 rounded to two significant figures is written as 0.787 × 10^

A common method to clean acid spills is to use Na_2 CO_3 (Molar mass 106 g ). If 50.0 mL of 0.75 M HCl is spilt on a wooden surface, the amount of Na_2 CO_3 required is

A balance having a precision of 0.001 g was used to measure a mass of a sample of about 15 g . The number of significant figures to be reported in this measurement is

Lipoic acid with the following structure is a growth factor required by many organisms. Percentages of ' S ' and ' O ' in lipoic acid respectively are (atomic masses of ' S ' and

Mercury is highly hazardous and hence its concentration is expressed in the units of ppb (micrograms of Hg present in 1 L of water). Permissible level of Hg in drinking water is

A mixture of sodium (Na) and potassium (K) metals weighing 32 g was reacted with water and the solution obtained could be neutralized with 517.3 mL of 1.0 M H_2 SO_4(aq) . The

The results obtained by four students, each performing a set of four titrations with the same solution under identical conditions, are given below. If the expected titre value is

If refractive index, density, pressure, volume, heat capacity and surface tension are represented respectively as η, ρ, P, V, Q and γ , the set that contains only intensive

When 0.805 g of the potassium salt (CH_2)_ n (COOK)_2 of a dibasic organic acid was reduced, 0.323 g of potassium was obtained. Molar mass of the acid is

A student performed an experiment to determine the molecular formula of a given sample of hydrated copper (II) sulphate by weighing the sample before and after heating. The

Sodium azide (NaN_3) is used in the airbag of cars. This is a safety device which inflates on an impact according to the reaction 2 NaN_3 arrow 2 Na+3 ~N_2 An air bag of a

At constant T and P, 5.0 ~L of SO_2 are reacted with 3.0 L of O_2 according to the following equation 2 SO_2(~g)+O_2(~g) arrow 2 SO_3(~g) The volume of the reaction mixture at the

Number of moles of KClO_3 that have to be heated to produce 1.0 L of O_2(~g) at STP can be expressed as

A fuel/oxidant system consisting of N, N -dimethylhydrazine (CH_3)_2 NNH_2 and N_2 O_4 (both liquids) is used in space vehicle propulsion. The liquid components are mixed

An agriculturist wants to use different concentrations of phosphorus as a fertilizer using P_4 O_ 10 . The correct expression to calculate P from P_4 O_ 10 is

Antacids are medicines that temporarily neutralize the acid in the stomach and prevent heartburns. The volume of an antacid syrup containing 2.9 g of Mg(OH)_2 per 100 mL to be

The analysis of three different binary oxides of bromine (Br) and oxygen (O) gives the following results: Compound Mass of O combined with 1.0 g of Br X 0.101 g Y 0.303 g Z 0.503

Among the following numbers, the one in which all the zeros are significant is