Lab chem 107

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Lab Chemistry Quiz 107

Test your knowledge in lab chemistry with this engaging quiz designed for students and educators alike. Explore various topics including chemical reactions, solution calculations, and acid-base titrations.

20 challenging questions
Multiple choice format
Instant feedback on your answers

20 Questions5 MinutesCreated by MixingChemical123

The lowest scaling of a graduated cylinder is 0.1 ml , Then the precision of this cylinder is:

0.1

0.2

0.01

0.05

A mixture containing 20%NaCl , 0.45g SiO2 and unknown amount of NH4Cl. When the mixture heated, its mass was decreased to 1.75(g) . The mass of NH4Cl in this mixture is:

6.5

8.25

1.3

4.75

Given the following reaction: 2Al+6HCl---->2AlCl3+3H2........When 2g of Al (mm=27) is reacted completly with excess HCl, it gives 4.6g of AlCl3(mm=133.5). The percent yield of this reaction is:

53%

47%

64%

15%

Calculate the freezing point of 65% etheleneglycol (mm=62), for water kf=1.86 and Tf=0

16.2

-16.2

55.7

-55.7

A 0.567g sample of an umknown diprotic acid requires 8mL of 0.2M NaOH to reach the end point, the molar mass of the acid is:

708.8

354.4

2.82*10^-3

105

The color of pH.pH indicator is:

Pink in NaOH

Colorless in NaOH

Pink in H2SO4

None of these

When 6g of NaOH (mm=40) disssolved in 90g of water, the temperature was increased from 22C to 27C . If specific heat of solution is (4.18J/g.C) and the density is (1g/mL).the heat of this solution in(KJ/mol) is:

9.2

7.1

25.9

13.4

When 2g of NaOH dissolved in 50g of water, a 16.2KJ of heat was evolved. If the same amount of NaOH dissolved in 50g of HCl solution, the amount of heat evolved is :

Equal 16.2KJ

Lower than 16.2KJ

Higher than 16.2KJ

Equal to zero

How many grams of Cu(mm=63) could be produced through the reaction of 15mL of 0.8M CuSO4 solution with excess Zn: Zn+CuSO4----->ZnSO4+Cu

0.76g

0.57g

0.19g

0.38g

The element that has ability to gain electrons is classified as :

Oxidized element and oxidized agent

Reduced element and reducing agent

Oxidized element and reducing agent

Reduced element and oxidizing agent

In the following reaction : CuSO4+Zn----->Cu+ZnSO4 ... The reduced species is

CuSO4

Cu+2

In the experiment of determination the rate law of the reacion between H2O2 and KI , the concentration of hydrogen ion was stablized by the addition of ........ To the reaction

Buffer

Na2S2O3

Starch

If the total concentration of H2O2 is 0.04M and initial concenration of KI is 0.02M and the reaction is zero order in KI and first order in H2O2, the value of K is:

7*10^-4

3.5*10^-8

4.66*10^-5

2.33*10^-3

The following data in the table was obtained for the reaction : A+B--->C+D

**from these data what is the overall order of the reaction :

experiment number	[A]	[B]	INITIAL CONCENTRAION
1	0.06	0.03	0.0248
2	0.02	0.03	0.00276
3	0.02	0.09	0.00828

A reacts with C as :A+3C--->2B+D

an aqueous solution containing initially 0.05M of A and 0.072M of C is prepared and the progress of the reaction followed by measuring [C]

The concentration of A remaining at 400s is ........ M.

TIME (S)	0	400	800
[C] (M)	0.072	0.057	0.046

0.015

0.035

0.045

-0.007

The missing reagents (X,Y) respectively in the following reaction are:

X+2NH3---->Hg+Y+NH4Cl

Hg/Hg2Cl2

Hg2Cl2/Hg

Hg2Cl2/HgNH2Cl

HgNH2Cl/Hg2Cl2

You can separate PbCl2 from mixture of Hg2Cl2 and AgCl by adding

Hot water

HCl

NH3

K2Cr2O4

In ACID-BASE TITRATION experiment , when you want to add the base to the acid you will use the :

Beaker

Flask

Graduated cylinder

Buret

Lab chem 107

Lab Chemistry Quiz 107

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