Welcome to YESOTA CHM101 QUIZ 2
Overview:
This is a Test Simulator, we advise you to see yourself as being in the examination hall and avoid cheating.
Date: February 7, 2025
Duration: 35 minutes
No of Questions: 20 Questions
Course: CHM101
Instructions:
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1.
CHM101
What is the molar concentration of Na2C2O4 required for titration when 750.0cm³ of Na2C2O4 is titrated against 250.0cm³ of 0.50M acidified KMnO4? Leave your answers to 2s.f
2.
CHM101
In an experiment, which of the following observations would suggest that a solid sample is a mixture? The
3.
CHM101
Which of the following is NOT a pure substance?
5.
CHM101
Calculate the molarity of a solution after 1.70liters of 2.06M solution is diluted to 2.50liters?
6.
CHM101
What is the name of the reaction below?
BaCl2 + Na2SO4 ---> BaSO4 + NaCl.
7.
CHM101
J.J. Thomson proved that cathode rays were beams of _____.
8.
CHM101
Calculate the molarity of a solution prepared by bubbling 2.56g of HCl gas into enough water to make 26.8×10-³dm³ of solution
9.
CHM101
Pauli exclusion principle is related to ......
10.
CHM101
DDT, an insecticide harmful to fish, birds, and humans is produced in the laboratory according to the following equation: 2C6H5Cl + C2HOCl3 —> C14H9Cl5 + H2O (where C6H5Cl is chlorobenze and C2HOCl3 is chloral). In a government laboratory, 1142g of chlorobenze is reacted with 485g of chloral. What mass of DDT is formed. (C=12, H=1, Cl= 35.5, O=16)
11.
CHM101
Consider the equation below. What is a, b, c and d respectively?
aAs2S3 + bO2 ---> cAs2O3 + dSO2
12.
CHM101
How many grams of NaOH are needed to prepare 125mL of 0.2M solution of NaOH?
13.
CHM101
What is the molar concentration of a solution prepared by adding 50.0 mL of 0.22 M NaOH to 50.0 mL of 0.10 M NaOH?
14.
CHM101
Which of the following is NOT true of determinate errors?
15.
CHM101
A typical aspirin tablet contains 5×10^5 μg C9H804 - acetylsalicylic acid. What number if molecules of acetylsalicylic acid are in a 5×10^5 μg tablet [C=12, H=1, O=16]
16.
CHM101
In the hydrogen line spectrum, when n tends from infinity to 4, it is regarded as?
17.
CHM101
What volume of 22.22 moldm-³ of HNO3 is required to prepare 250cm³ of 0.22 moldm-³ HNO3?
18.
CHM101
Which change in principal quantum number for an electron in a hydrogen atom would correspond to emission of the longest wavelength photon?
19.
CHM101
The discovery of electrons was attributed to which of the following scientists?
20.
CHM101
What volume of the stock solution is required to prepare 500mL of 1.0M acetic acid from a 17.5M stock solution of the acid?
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