Test Details

Some Basic Concepts of Chemistry

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Dec 23, 3:00 PM

10 minutes

Dec 23, 3:10 PM

30.0 marks

MCQ

20 questions

prabhash kumar khare

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Class Details

Chemistry

11th Bio

Chemistry

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Question Text

Question 1 :
How many moles are present in $6.023\times 10^{22}$ molecules of $CO_2$?

Question 2 :
What is the volume of $3.0\times {10}^{20}$ molecules of $HCl (g)$?

Question 3 :
The critical volume of a gas is 0.036 $lit. mol^{-1}$. The radius of the molecule will be (in cm): (Avogadro Number = $6 \times 10^{23}$)

Question 4 :
Law of definite proportion does not apply to nitrogen oxide because:

Question 5 :
If the ratio of the atoms by mass is altered then :

Question 7 :
In a compound the ratio of the atoms or element by mass remains always same irrespective of :

Question 8 :
Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8. This shows the law of:

Question 9 :
The ratio of mass of nitrogen and oxygen in nitric oxide is in :

Question 10 :
The % of Copper and Oxygen in samples of CuO obtained by different methods were found to be the same. This proves the law of:

Question 11 :
Hydrogen, oxygen and carbon dioxide are taken in containers of $2 l$ volume each. Compare the ratio of the number of molecules of the three gases respectively, under same conditions of temperature and pressure.

Question 12 :
A chemical reaction: $A+B\rightarrow AB$, B is acting as limiting reagent then choose the correct option. The limiting reagent is?

Question 15 :
Which choice shows the answer to the following mathematical operation with the correct number of significant figures? $2.8\times 8.96 = ? $

Question 16 :
A student burns $2.0 g$ magnesium metal over a flame which reacts with excess oxygen. A white cyrstalline solid begins to form on the piece of magnesium. $2Mg_{(s)} + O_{2(g)} \rightarrow 2MgO_{(s)}$ How could you determine the reaction obeyed the law of conservation of mass?

Question 17 :
Statement I: The number $5,007$ has three significant figures Because Statement II: Zeros between non-zero digits are significant

Question 18 :
A student conducted an experiment and obtained three values during three repetitive trials: 1.65, 1.68, 1.71. Later, the student discovered that the true value was 2.37. In contrast to the real value, the experimental results should be characterized as:

Question 19 :
Under the same conditions, two gases have the same number of molecules. They must:

Question 20 :
Combustion of a piece of paper to form ash, water vapour and carbon dioxide follows law of conservation of mass.

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