Some Basic Concepts of Chemistry Practice Questions
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The mercury is the only metal which is liquid at 0°C. This is due to it
2 / 95
The equivalent weight of an acid is equal to:
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What is the molarity of H2SO4 solution that has a density 1.84 g/cc at 35°C and contains 98% H2SO4 by weight?
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One mole of a substance present in 1 kg of solvent. The correct statement regarding above solution is:
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What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of Elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?
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One mole of CH4 contains:
7 / 95
Express 145.6 L of chlorine in terms of gram moles
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Find the number of atoms present in 0.016 g of methane.
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The manganate and permanganate ions are tetrahedral, due to
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The molarity of pure water is:
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The vapor density of a mixture having NO2 and N2O4 is 27.6. The mole fraction NO2 in the mixture is:
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Which has maximum number of oxygen atoms?
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The volume of 1.0 g of hydrogen in litres at NTP is:
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The weight of one molecule of a compound C60H122 is:
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A compound possesses 8% sulfur by mass. The least molecular mass is:
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6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is:
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When 18 g of glucose is dissolved in 180 g of water then the mole fraction of glucose is:
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2 g of O2 at NTP occupies the volume:
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Which of the following statement is correct?
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How many grams of phosphoric acid is required to complete neutralize 120 g of sodium hydroxide?
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The molar concentration of 20 g of NaOH present in 5 litre of solution is:
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Among the following pairs of compounds, the one that illustrates the law of multiple proportions is:
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120 g of urea is present in 5 litre of solution. The active mass of urea is:
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Which of the following pairs of gases contains equal number of molecules?
(a) CO2 and NO2
(b) CO and (CN)2
(d) N2O and CO2
(c) NO and CO
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Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is:
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The number of oxygen atoms in 6.4 g of SO2 is:
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The number of significant figures in 306.45 and 40440 are respectively:
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The incorrect statement for 14 g of CO is:
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50 g of calcium carbonate completely burned in air. What is the weight (in grams) of the residue?
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The reaction,
2Al(s) + 6HCl(aq)----------------> 2Al3+ +6Cl- + 3H2 (g)
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The weight of a single atom of oxygen is:
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0.25 mol of P4 molecules contains_______atoms.
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The pollution of SO2 in air is 10 ppm by volume. The volume of SO2 per litre of air is:
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The amount of NH3 formed by the combustion of 2 L of N2 and 2 L of H2 is:
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The correct relationship between molecular mass and vapor density is:
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What is the Mass of 0.5 moles of O3 molecules?
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The specific heat of metal is 0.16. Its atomic weight is:
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Volume of a gas at NTP is 1.12 × 10-7 cc. The number of molecules in it is:
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Which among the following is the heaviest?
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7.5 g of a gas occupies 5.6 liters as STP. The gas is:
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A boy drinks 500 mL of 9% glucose solution. The number of glucose molecules he has consumed are [mol. wt. of glucose = 180].
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1000 g calcium carbonate solution contains 10 g carbonate. The concentration of the solution is:
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The oxide of an element contains 67.67% of oxygen and the vapour density of its volatile chloride is 79. Equivalent weight of the element is:
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The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is:
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The amount of zinc required to produce 224 mL of H2 at STP on treatment with dilute H2SO4 will be (Zn = 65):
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Area of nuclear cross section is measured in ‘Barn’. It is equal to:
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The quantity of PV/ KBT represents the:
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15 liter atmosphere is equal to:
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Number of moles of a solute per kilogram of a solvent are called:
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How many grams of CH3OH would have to be added to water to prepare 150 mL of a solution that is 2.0 M CH3OH?
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Which of the following is the odd one with regard to mass?
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The amount of O2 formed at N.T.P by the complete combustion of 1 kg coal is:
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The volume in litres of CO2 liberated at STP, when log of 90% pure limestone is heated completely is:
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4 g caustic soda is dissolved in 100 cc of solution. The normality of solution is:
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How many moles of acidified FeSO4 can be completely oxidized by one mole of KMnO4?
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To neutralize completely 20 ml of a 0.1 M aqueous solution of phosphorus acid, the volume of 0.1 M aqueous KOH solution required is:
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Number of atoms in 560 g of Fe (atomic mass 56 gmol-1) is:
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The samples of NaCl are produced when Na combines separately with two isotopes of chlorine Cl35 and Cl37. Which law is illustrated?
62 / 95
If equal moles of water and urea are taken in a vessel what will be the mass percentage of urea in the solution?
63 / 95
Normality of 0.04 M H2SO4 is:
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From the complete decomposition of 20 g CaCO3 at STP the volume of CO2 obtained is:
65 / 95
A gaseous mixture contains O2 and N2 in the ratio 1:4 by weight. Then the ratio of their number of molecules in the mixture is:
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0.30 g of a volatile liquid displaces 90.0 cm3 of air at STP in the Victor Meyer’s method. The molecular mass of the liquid is:
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The normality of orthophosphoric acid having a purity of 70% be weight and specific gravity 1.54 is:
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69 / 95
Maximum number of molecules will be in:
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A breakfast cereal in advertising to contain 110 mg of sodium per 100 g of the cereal. The percent of sodium in the cereal is:
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The number of e– present in 3.6 ml drop of water with a density of 1 g/ml as?
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The number of grams of a dibasic acid (molecular weight 200) present is 100 mL of its aqueous solution to give decinormal strength is:
73 / 95
If we consider that 1/6, in place of 1/12, mass of a carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
74 / 95
The number of molecules in 4.25 g of ammonia is:
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76 / 95
The maximum number of molecules is present in:
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What is the correct micro, nano, femto, and pico order here?
78 / 95
25 mL of a solution of barium hydroxide titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 mL. The molarity of barium hydroxide solution was:
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The equivalent weight of phosphoric acid (H3PO4) in the reaction: NaOH + H3PO4 ----------- > NaH2PO4 + H2O is
80 / 95
The vapour density of ozone is:
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The hydrated salt Na2CO3 nH2O undergoes 63% loss in mass on heating and becomes anhydrous. The value of n is:
82 / 95
How many moles of potassium chlorate should be decomposed completely to obtain 67.2 liters of oxygen at STP?
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How many grams of KCl must be added to 75 g of water to produce a solution with a molality of 2.25?
84 / 95
The number of moles of KCl in 1000 mL of 3 molar solution is:
85 / 95
At STP the density of a gas (mol. wt. = 45) in g/L is:
86 / 95
The normality of H2SO4 having 50 milliequivalent in 2 L solution is:
87 / 95
Number of atoms in 4.25 g of NH3 is approximately:
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800 g of a 40% solution by weight was cooled. 100 g of solute precipitated. The percentage composition of remaining solution is:
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2.76 g of silver carbonate (At. mass of Ag = 108) on being heated strongly yields a reduce weight:
90 / 95
A mole of any substance is related to:
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Mixture X = 0.02 mol of [Co(NH3)5SO4]Br and [Co(NH3) 5Br]SO4 was prepared in 2 litre of solution. 1 litre of mixture X + excess AgNO3 Y 1 litre of mixture X + excess BaCl2 Z Number of moles of Y and Z are:
92 / 95
Normality of 0.3 M H3PO4 solution is:
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5 g of CH3COOH is dissolved in one litre of ethanol. Suppose there is no reaction between them. If the density of ethanol is 0.789 g/mL then the molality of resulting solution is:
94 / 95
The value of 1 amu is equal to:
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The weight of 1 × 1022 molecules of CuSO4.2H2O is:
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