Some Basic Concepts of Chemistry

The mercury is the only metal which is liquid at 0°C. This is due to it

The equivalent weight of an acid is equal to:

What is the molarity of H₂SO₄ solution that has a density 1.84 g/cc at 35°C and contains 98% H₂SO₄ by weight?

One mole of a substance present in 1 kg of solvent. The correct statement regarding above solution is:

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?

One mole of CH₄ contains:

Express 145.6 L of chlorine in terms of gram moles

Find the number of atoms present in 0.016 g of methane.

The manganate and permanganate ions are tetrahedral, due to

The molarity of pure water is:

The vapor density of a mixture having NO₂ and N₂O₄ is 27.6. The mole fraction NO₂ in the mixture is:

Which has maximum number of oxygen atoms?

The volume of 1.0 g of hydrogen in litres at NTP is:

The weight of one molecule of a compound C₆₀H₁₂₂ is:

A compound possesses 8% sulfur by mass. The least molecular mass is:

6.02 × 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of urea solution is:

One mole of CH₄ contains:

When 18 g of glucose is dissolved in 180 g of water then the mole fraction of glucose is:

2 g of O₂ at NTP occupies the volume:

Which of the following statement is correct?

How many grams of phosphoric acid is required to complete neutralize 120 g of sodium hydroxide?

The molar concentration of 20 g of NaOH present in 5 litre of solution is:

Among the following pairs of compounds, the one that illustrates the law of multiple proportions is:

120 g of urea is present in 5 litre of solution. The active mass of urea is:

Which of the following pairs of gases contains equal number of molecules?

Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is:

The number of oxygen atoms in 6.4 g of SO₂ is:

The number of significant figures in 306.45 and 40440 are respectively:

The incorrect statement for 14 g of CO is:

50 g of calcium carbonate completely burned in air. What is the weight (in grams) of the residue?

The reaction,

2Al_(s) + 6HCl_(aq)----------------> 2Al³⁺ +6Cl^-  + 3H₂ (g)

The weight of a single atom of oxygen is:

0.25 mol of P₄ molecules contains_______atoms.

The pollution of SO₂ in air is 10 ppm by volume. The volume of SO₂ per litre of air is:

The amount of NH₃ formed by the combustion of 2 L of N₂ and 2 L of H₂ is:

The correct relationship between molecular mass and vapor density is:

What is the Mass of 0.5 moles of O₃ molecules?

The specific heat of metal is 0.16. Its atomic weight is:

Volume of a gas at NTP is 1.12 × 10^-7 cc. The number of molecules in it is:

Which among the following is the heaviest?

7.5 g of a gas occupies 5.6 liters as STP. The gas is:

A boy drinks 500 mL of 9% glucose solution. The number of glucose molecules he has consumed are [mol. wt. of glucose = 180].

1000 g calcium carbonate solution contains 10 g carbonate. The concentration of the solution is:

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:

The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is:

The amount of zinc required to produce 224 mL of H₂ at STP on treatment with dilute H₂SO₄ will be (Zn = 65):

Area of nuclear cross section is measured in ‘Barn’. It is equal to:

The quantity of PV/ K_BT represents the:

15 liter atmosphere is equal to:

Number of moles of a solute per kilogram of a solvent are called:

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?

Which of the following is the odd one with regard to mass?

The amount of O₂ formed at N.T.P by the complete combustion of 1 kg coal is:

The molarity of pure water is:

The volume in litres of CO₂ liberated at STP, when log of 90% pure limestone is heated completely is:

The molarity of pure water is:

4 g caustic soda is dissolved in 100 cc of solution. The normality of solution is:

How many moles of acidified FeSO₄ can be completely oxidized by one mole of KMnO₄?

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:

Number of atoms in 560 g of Fe (atomic mass 56 gmol^-1) is:

The samples of NaCl are produced when Na combines separately with two isotopes of chlorine Cl³⁵ and Cl³⁷. Which law is illustrated?

If equal moles of water and urea are taken in a vessel what will be the mass percentage of urea in the solution?

Normality of 0.04 M H₂SO₄ is:

From the complete decomposition of 20 g CaCO₃ at STP the volume of CO₂ obtained is:

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:

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:

The normality of orthophosphoric acid having a purity of 70% be weight and specific gravity 1.54 is:

2 g of O₂ at NTP occupies the volume:

Maximum number of molecules will be in:

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:

The number of e^– present in 3.6 ml drop of water with a density of 1 g/ml as?

The number of grams of a dibasic acid (molecular weight 200) present is 100 mL of its aqueous solution to give decinormal strength is:

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:

The number of molecules in 4.25 g of ammonia is:

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:

The maximum number of molecules is present in:

What is the correct micro, nano, femto, and pico order here?

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:

The equivalent weight of phosphoric acid (H₃PO₄) in the reaction: NaOH + H₃PO₄ ----------- > NaH₂PO4 + H₂O is

The vapour density of ozone is:

The hydrated salt Na₂CO₃ nH₂O undergoes 63% loss in mass on heating and becomes anhydrous. The value of n is:

How many moles of potassium chlorate should be decomposed completely to obtain 67.2 liters of oxygen at STP?

How many grams of KCl must be added to 75 g of water to produce a solution with a molality of 2.25?

The number of moles of KCl in 1000 mL of 3 molar solution is:

At STP the density of a gas (mol. wt. = 45) in g/L is:

The normality of H₂SO₄ having 50 milliequivalent in 2 L solution is:

Number of atoms in 4.25 g of NH₃ is approximately:

800 g of a 40% solution by weight was cooled. 100 g of solute precipitated. The percentage composition of remaining solution is:

2.76 g of silver carbonate (At. mass of Ag = 108) on being heated strongly yields a reduce weight:

A mole of any substance is related to:

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:

Normality of 0.3 M H₃PO₄ solution is:

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:

The value of 1 amu is equal to:

The weight of 1 × 10²² molecules of CuSO₄.2H₂O is: