Question 1 :
How many moles are present in $6.023\times 10^{22}$ molecules of $CO_2$?<br>
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):<br/>(Avogadro Number = $6 \times 10^{23}$)<br/>
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 :<br/>
Question 8 :
Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8. This shows the law of:<br/>
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:<br/>
Question 11 :
Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:
Question 14 :
According to J.J Thomson's atomic model, negative charges are embedded in:
Question 16 :
___________ said that cathode rays consist of negatively charged particles and these were named as electrons.
Question 22 :
Oxygen consists of isotopes ${{\text{O}}^{16}}\,$,${{\text{O}}^{17}}\,$ and ${{\text{O}}^{18}}\,$ carbon consists of isotopes of ${{\text{C}}^{{\text{12}}}}$ and ${{\text{C}}^{{\text{13}}}}$ Total number of ${\text{C}}{{\text{O}}_2}$ molecules possible are
Question 30 :
Who said that cathode rays consist of negatively charged particles ?
Question 33 :
The attempt for classifying elements by plotting the atomic masses of elements against the atomic volumes was made by:
Question 35 :
Which scientist came up with the concept of a periodic table that included all of the known elements?<br>
Question 37 :
The name given by Newlands to the arrangement created by him was :
Question 38 :
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of  58.69 amu. Reason for the same is that :
Question 40 :
Which of the following triads does not follow Dobereiner's law of triads?
Question 41 :
Cl, Br, I  follows Dobereiner's triads, the atomic masses of Cl and I are 35.5 and 127 respectively. The atomic mass of Br is : <br/>
Question 42 :
Statement: In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements of a triad.<br/><br/>State whether the given statement is true or false.
Question 43 :
In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.<br/>
Question 45 :
Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements?
Question 48 :
If X and Y are two elements which belong to same group of Newland's periodic table, how many elements exists between X and Y?
Question 49 :
Which of the following is the correct set of elements to Dobereiner's triads ?
