FSC Chemistry MCQs Chapter 2 Class 11 - PLS Prep by PakLearningSpot

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Created on February 10, 2022

Chemistry Ch 2 Class 11 Experimental Techniques in Chemistry

1 / 36

If during crystallization more solute could not be dissolved in the solution, the solution is:

Saturated solution

Dilute solution

Concentrated solution

None of these

2 / 36

Slow cooling yields crystals of length?

Medium size

Small

Bigger

None of these

3 / 36

Atomic number of C is 6 and H is 1. How many electrons are present In 1.6 grams of methane?

NTS 2015 DUHS and JSMU
Chemistry
Stoichiometry
Elimination Tool:

A) 6.02 x 1023

B) 1.204 x 1023

C) 1.806 x 1023

D) 2.408 x 1023

4 / 36

How will you separate water and kerosene oil?

Distillation

Filtration

Sublimation

Crystallization

5 / 36

A residue is obtained In which of the following methods?

Crystallization

Filtration

Condensation

Decantation

6 / 36

Which of the following can ba employed instead of filter papers?

Gooch Crucible

Sintered Glass Crucible

Both a and b

None of these

7 / 36

The mechanism of reaction can be understood by

PMC Practice 6
Chemistry
Experimental Techniques in Chemistry
Elimination Tool:

A) Experimental details

B) Balanced chemical equation

C) Molar Ratio

D) All of these

8 / 36

78 g of a hydrocarbon occupies 22.414 ml of volume at S.T.P. The empirical formula of the hydrocarbon is CH. The molecular formula of this hydrocarbon is:

NUMS 2014
Chemistry
Fundamental Principles of Organic Chemistry
Stoichiometry
Analytical Chemistry
Elimination Tool:

A) C2H4

B) C6H6

C) C8H8

D) C4H4

9 / 36

If we take 2.2 grams of CO2, 6.02 x 1021atoms of nitrogen. and 0.03-gram atoms of sulfur, then the molar ratio of C, N, and atoms will be:

NTS 2013
Chemistry
Stoichiometry
Elimination Tool:

A) 1:2:5

B) 5:1:2

C) 2:5:3

D) 5:1:3

10 / 36

Given the reaction:

C3H6 + 5O2 → 3CO2 +4H2O

At STP, how many liters of O2 are needed to completely burn 5.0 liters of C3H6?

NTS 2010
Chemistry
Stoichiometry
Elimination Tool:

A) 5

B) 10

C) 10.5

D) 25

11 / 36

Water and mercury can be separated by:

Evaporation

Sublimation

Filtration

Solvent extraction

12 / 36

Change in Pressure will only affect the substances which are in:

PMC Practice 4
Chemistry
Experimental Techniques in Chemistry
Elimination Tool:

A) Liquid state

B) Solid State

C) Plasma state

D) Gaseous State

13 / 36

The rate of filtration can be considerably increased by using

Fluted filter paper

Suction flask

Stirrer

None of these

14 / 36

% of oxygen by mass. What is the empirical formula of ascorbic acid?

NUMS 2016
Chemistry
Stoichiometry
Elimination Tool:

A) C3H4O3

B) C3H4O6

C) CH4O3

D) C6H4O3

15 / 36

The molecular formula expresses?

NTS 2015 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

A) Relative number of atoms and electrons

B) actual number of atoms

C) both relative and actual number of atoms

D) none of the above

16 / 36

106 gram of Na2CO3 per dm3 of the solution of Na2CO3 in water, the concentration of the solution will be:

NTS 2018
Chemistry
Stoichiometry
Elimination Tool:

A) 1N

B) 0.1 M

C) 1M

D) 0.02M

17 / 36

Silver oxide decomposes when heated to silver and oxygen. If 0.5 moles of lunar caustic is heated up to 450 degrees, giving out Nitrogen dioxide and oxygen leaving silver as metal, what is the mass of the residue?

NTS 2015 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

A) 108 grams

B) 54 grams

C) 216 grams

D) 27 grams

18 / 36

Which of the following will be separated by filtration?

Salt and water

Sugar and water

Alcohol and water

None of these

19 / 36

If the distribution co-efficient is small then the solute will:

Distribute itself equally

Flow down the mobile phase

Remain in mobile phase

Remain in stationary phase

20 / 36

While calculating vapor pressure of a liquid in manometer, the column of mercury facing the vapors of a liquid is _____ due to pressure on surface of liquid in flask.

PMC Practice 1
Chemistry
Experimental Techniques in Chemistry
Elimination Tool:

A) Compressed

B) Depressed

C) Rises

D) Lowers

21 / 36

Which of the following is the chemical formula of a compound indicating the relative number of atoms in the simplest ratio?

NTS 2016 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

A) Empirical formula

B) Empirical formula mass

C) Molecular formula

D) Molecular mass

22 / 36

Filtration process could be very time consuming if it is not aided by a gentle suction which is developed:

If the paper covers the funnel up to its circumference

If the paper has got small sized pores In It.

If the stern of the funnel is large so that it dips into the filtrate

If the paper fits tightly all around the upper circumference of the funnel

23 / 36

The efficiency of chemical reaction can be expressed as:

PMC 2020
Chemistry
Stoichiometry
Elimination Tool:

A) Theoretical yield

B) Actual yield

C) % yield

D) Maximum yield

24 / 36

What volume in dm3 of KCl is obtained in the following equation if the volume of KCIO3 at the beginning of the reaction is 20 dm3?

2KClO3 -> 2KCl + 3O2

NTS 2016 DUHS & JSMU
Chemistry
Stoichiometry
Elimination Tool:

B) 74.5 dm3

C) 50 dm3

D) 40 dm3

E) 20 dm3

25 / 36

A compound was found to contain nitrogen and oxygen in the ratio 28g:80g. The formula of the compound is:

NTS 2017
Chemistry
Stoichiometry
Elimination Tool:

A) NO

B) N2O3

C) N2O4

D) N2O5

26 / 36

The empirical formula of Glucose C6H12O6 is:

PMC 2020
Chemistry
Stoichiometry
Elimination Tool:

A) C6H12O6

B) CHO

C) CH2O

D) CH2O2

27 / 36

A bottle of cold drink contains 200 ml liquid in which CO2 is 0.1 molar . Suppose carbon dioxide behaves like an ideal gas the volume of dissolved carbon dioxide at STP is?

NTS 2015 DUHS and JSMU
Chemistry
Stoichiometry
Elimination Tool:

A) 0.224 L

B) 0.448 L

C) 22.4 L

D) 2.24 L

28 / 36

is the process of transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.

Vaporization

Evaporation

Sublimation

None of these

29 / 36

Equal weights of methane and hydrogen are mixed in an empty container at 25°C. The fraction of total pressure exerted by hydrogen is:

NTS 2013
Chemistry
Stoichiometry
Elimination Tool:

A) ½

B) 8/9

C) 1/9

D) 16/17

30 / 36

22.4 dm3 of volume of each H2 and O2 are sparked to produce water vapours (considered as ideal gas) on completion of reaction. What is the decrease in the volume of the vessel?

NTS 2016 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

A) 44 dm3

B) 22.4 dm3

C) 33.6 dm3

D) 11.2 dm3

31 / 36

Which of the following is the safest way to dry crystals during crystallization?

Pressing between folds of paper

Boiling

Cooling

Vacuum desiccator

32 / 36

In a vessel, 10 g N2, 10 g H2 and 10g O2 are present. Which one will have least number of atoms?

PMC 2020
Chemistry
Stoichiometry
Elimination Tool:

A) H2

B) N2

C) O2

D) Both H2 and N2

33 / 36

The process of changing a solid directly into gas upon heating is known as:

Sublimation

Liquefaction

Condensation

None of these

34 / 36

C12H22O11+ conc. H2SO4—> 12 C + ? + H2SO4

NTS 2016 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

A) 11 H2O

B) 11 O2

D) 11 H2

C) 11 CO2

35 / 36

2 grams of H2 molecules contain ______ molecules.

NTS 2012
Chemistry
Stoichiometry
Elimination Tool:

A) 12.04 x 1023

B) 6.02 x 1023

C) 3.01 x 1023

D) 1.008

36 / 36

The chemical analysis of a compound having molecular mass 188 gives, C=12.8%, H=2.1% and Br=85.1%. Its molecular formula is:

NTS 2014
Chemistry
Stoichiometry
Elimination Tool:

A) CH2Br

B) C2H4Br2

C) C2H4Br

D) CH2(Br)2

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