Mole Concepts Questions

Given below are two statements: Statement I: Average atomic mass of chlorine is fractional. Statement II: Average atomic mass is calculated by using natural abundances of different isotopes. In the light of the above statements, choose the most appro

For the reaction, when 2 mole of ammonia and 3 mol of oxygen are allowed to react then;

The flasks of same volume are filled with , and respectively at same temperature and pressure. The weight of the flasks containing , and is , and respectively. The ratio of the weights is;

Four gram of mixture of calcium carbonate and sand is treated with excess of HCl and 0.880 g of carbon dioxide is produced. What is the percentage of calcium carbonate in original mixture?

⚠️ Diagram Detected: The AI detected a chemistry or physics diagram here. Please upload the image manually using the editor.Gammaxene insecticide powder is prepared by the reaction given above. If 78 g of benzene (molar mass = 78 g/mol) reacts with 1

If 8 g and 32 g is allowed to react to form water then which of the following statements is correct?

The volume of air required to burn 8 litres of is approximately (air contains 20% of ):

Treatment of (table sugar, molar mass = ) with excess concentrated yields a black residue (pure carbon) and water vapour. What is the maximum mass of carbon that can be obtained from exactly one gram of ?

An element has two isotopes having atomic mass 10 and 12 u respectively. If the % abundance of lighter isotope is 80% then the average atomic mass of element will be;

10 mL of 1 M solution and 5 mL of 0.5 M are mixed together to precipitate out . The amount of precipitated will be;

What would be the molality of 20% (mass/mass) aqueous solution of KI? (molar mass of KI = )

Mass of two moles of sodium oxide is equal to; (Atomic mass of Na = 23 u, O = 16 u)

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion A: Significant figures for 0.300 are 3 whereas for 300 it is 1. Reason R: Zeros at the end or right of a number are significant provid

Given below are two statements: Statement I: Number of oxygen atoms in 8 g of ozone is . Statement II: Number of atoms in 5.1 g of NH3 is . In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following law states that, "a given compound always contains exactly the same proportion of elements by weight"?

Total number of atoms in 196 amu H2SO4 are; (Molecular mass of H2SO4 = 98 amu)

Number of molecules of water in a drop of water weighing 0.09 g are; (molar mass of g/mol)

If the molar mass of sodium is 23 g/mol, the number of moles in 46 g of sodium is;

In the reaction , ratio by volume of N2, H2 and NH3 is 1:3:2. This illustrates law of;

If a hydrocarbon contains 80% of carbon, then the hydrocarbon is;

Which of the following is not a basic postulate of Dalton's atomic theory?

If law of conservation of mass was to hold true, then 20.8 g of on reaction with 9.8 g of will produce 7.3 g of HCl and equal to;

Identify the incorrect match.

1 amu equals to;

A solution is prepared by adding 5 g of a solute into 20 g of water. The mass percent of the solute in the solution is;

The molarity of pure water is;

Find total number of electrons in one molecule of .

When 4 g of hydrogen is ignited with 4 g of oxygen, the amount of water formed is;

Given that the abundances of isotopes , and are 5%, 90% and 5%, respectively. The average atomic mass of Fe is;

Given below are two statements: Statement I: The balancing of chemical equations are based on law of conservation of mass. Statement II: Total mass of reactants is equal to the total mass of products in a balanced chemical equation. In the light of t

Element X forms five stable oxides of formula: The formation of the oxides explains;

Which of the following concentration term depends on temperature?

Identify, for which of the following compounds formula mass is used in place of molecular mass.

How many moles of potassium chlorate need to be heated to produce 11.2 litres of oxygen at N.T.P?

Which of the following is an example of a compound?

In the reaction, , when 1 mole of and 1 mole of are made to react to completion;

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is;

Suppose the elements X and Y combine to form two compounds and . When 0.1 moles of weighs 10 g and 0.05 moles of weighs 9 g, the atomic mass of X and Y are, respectively;

The molality of the solution containing 20% (w/w) solution of NaOH is: (Molar mass of NaOH = 40 g/mol)

500 mL of a glucose solution contains 90 g of glucose. The concentration of the solution is: (Given: molar mass of glucose is 180 g mol⁻¹)

Avogadro's number is the number of molecules present in;

A molal solution is the one that contains one mole of a solute in;

0.0011 can be written in scientific notation as;

The number of moles of oxygen required for complete combustion of 1 mole of propane is;

The mass of molecules of is; (Given: )

The amount of NaOH required to prepare 250 mL of 0.1 M solution is;

The vapour density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule of the element is triatomic, what will be its atomic mass?

The value of 35°C in Fahrenheit scale will be;

The total number of electrons present in one molecule of methane is;

The number of moles of nitrogen atoms present in 112 g of N2 is: [Atomic mass of N = 14 amu]