Some Basic Concepts of Chemistry

This is an MCQ-based quiz on the topic of Some Basic Concepts of Chemistry.

This includes Laws Of Chemical Combination, Law of Conservation of Mass, Gay Lussac’s Law of Gaseous Volumes, Law of Definite Proportions, Avogadro Law, and many more.

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Many countries use Fahrenheit scale for expressing temperature of atmosphere. If temperature in any such country is measured 41°F then what is its value in celcius scale and would you expect hot or cold atmosphere in that country?

5°C, cold 15°C, cold 25°C, normal 41°C, hot

The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are

3,3 and 3 respectively 3,4 and 4 respectively 3,4 and 5 respectively 3,3 and 4 respectively

Which of the following substances cannot be separated in

Solid glucose Salt and sugar Sugar and water solution None of these

A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale ?

93.3 °C 40° C 94° C 30° C

Which of the species is not paramagnetic?

As+ Cl– Ne2+ Be+

Elements A and B combine to form two compounds AB and A2B. Find the atomic weight of A and B, if the weight of 0.1 moles of AB is 10g and 0.05 moles of A2B is 9g?

30, 20 80, 20 60, 40 20, 30

Which one of following will have maximum numbers of water molecules?

18 molecules of water 1.8 grams of water 18 grams of water 18 moles of water

The number of atoms present in 0.1 moles of a triatomic gas will be

1.806 × 10^23 1.806 × 10^22 3.600 × 10^23 6.026 × 10^22

The volume of O2 required to burn 1 L of propane completely, measured at 0℃ temperature and 1 atm pressure will be

10 L 7 L 6 L 5 L

Which of the species among following is not paramagnetic?

As+ Cl– Ne2+ Be+

A container has an equal mass of H2, O2 and CH4 at 27℃, the ratio of their volume is

16:8:1 8:1:2 16:1:2 8:16:1

There are two chlorides of sulphur S2Cl2 and SCl2. What is the equivalent mass of S in SCl2