Moles Test for IIT Jee| AIEEE | 11th Class| 12th Class

Descriptive Questions(Section –I)

Total Marks: 35+10=45

This section contains 8 questions. All questions are compulsory and marks will be awarded on the basis of approach towards questions:

Question No.1

Define the different methods used for expressing concentration of a solution. (5 Marks)

Question No.2

Calculate the amount of water (g) produced by the combustion of 16 g of methane. (2 Marks)

Question No.3

A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass per cent of the solute. (3 Marks)

Question No.4

State and explain the following with common example (12 Marks)

1. Law of conservation of mass

2. Law of Gay Lussac’s Law

3. Avogadro’s Law

4. Law of Multiple Proportion

Question N0.5

Calculate the mass of sodium acetate (CH₃COONa) required to make 500 mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1. (3 Marks)

Question No.6

Prove Avogadro’s number is equal to 6.02*10^{^23}. (2 Marks)

Question No.7

What is limiting reagent? What is the significance of limiting reagent in chemical reaction? (3 Marks)

Question No.8

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction:

4 HCl (aq) + MnO2(s) →2H2O (l) + MnCl2(aq) + Cl2 (g)

How many grams of HCl react with 5.0 g of manganese dioxide? (5 Marks)

Objective Type Questions (Section-II)

2 marks will be awarded to every right answer and 1 marks will be deducted for every wrong answer, No marks will be given on any unattempted question:

Q.No.1.

The percentage of copper and oxygen in samples of CuO obtained by different methods is found to be same. This illustrates the law:

A) Multiple Proportion B)Conservation Of Mass C) Gay Lussac’s Law D) None of these

Q.No.2

The number of electrons in one mole of hydrogen molecule is:

A) 6.02*10^23 B) 12.04*10^23 C)18.06*10^23 D)None of these

Q.No.3

The percentage of oxygen in NaOH is:

A)40 B)60 C)8 D)10

Q.No.4

Normality of 2M sulphuric acid is:

A) 2N B) 4N C) N/2 D) N/4

Q.No.5

How many atoms are contained in one mole of sucrose (C₁₂H₂₂O₁₁):

A) 45*6.02*10²³ B) 5*6.02*10²³ C)10*6.02*10²³ D)None of these