Test Details

Chapter 1

Basic concept in chemistry

Dec 08, 8:00 PM

30 minutes

Dec 08, 8:30 PM

40.0 marks

MCQ

20 questions

Dinesh kumar

12 Pass out from Jawahar Navoday Vidyalya Jaswantpura Jalore.M.Sc bed In Chemistry.Rpsc selected second grade teacher .5 year experience as a science teacher in Govt Senior Secondary school.RPSC selected Lecturer. 10 Year experience in teaching Chemistry in govt senior secondary school.

Class Details

Chemistry

Agriculture

Chemistry

Agriculture

We will complete ncert syllabus of Chemistry and physics on time period

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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 :
The number of atoms in 67.2 L of ${ NH }_{ 3 }$(g) at STP is:

Question 12 :
Statement I: The number $5,007$ has three significant figures Because Statement II: Zeros between non-zero digits are significant

Question 14 :
The haemoglobin contains $0.33$% of iron by weight. Its molecular weight is $67200$. What is the number of iron atoms in each molecule (atomic weight of iron$=56$)?

Question 15 :
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 16 :
Percentage purity of a sample of gold is $85\%$. How many atoms of gold are present in its $1$ gram sample? (Atomic mass of gold $=197$u).

Question 17 :
$10$ mL of hydrogen combines with $5$ mL of oxygen to yield water. When $200$ mL of hydrogen at STP is passed over heated $CuO$, the $CuO$ loses $0.144$ g of its weight. State the law illustrated by these chemical combinations.

Question 18 :
When 100 ml of a $O_{2} - O_{3}$ mixture was passed through turpentine, there was the reduction of volume by 20 ml. If 100ml of such a mixture is heated, what will be the increase in volume?

Question 20 :
A student performs a titration with different burettes and finds titre values of $25.2$ ml, $25.25$ ml and $25.0$ ml. The number of significant figures in the average titre value is :

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