Test Details

Atoms and Molecules

Jan 31, 4:30 PM

40 minutes

Jan 31, 5:10 PM

50.0 marks

MCQ

25 questions

Shiv Anand

Class Details

Maths

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Question Text

Question 2 :
How many atoms are represented in$\displaystyle { Na }_{ 2 }{ CO }_{ 3 }\cdot 10{ H }_{ 2 }O$

Question 4 :
Which of the following sample contains the maximum number of atoms?

Question 6 :
If u are given Avogadro number (N) of atoms of a gas X if half of atoms are converted into X(g) + by energy $\Delta$H. the IE of X is?

Question 7 :
The molecular mass of $(NH_2)_2CO$ is :(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)<br/>

Question 10 :
Two elements $A$ and $B$ contain $13$ and $8$ protons respectively. If the number of neutrons in them happen to be $14$ and $8$ respectively; the formula unit mass for the compound between $A$ and $B$ unit would be:

Question 14 :
The molecular weight of 2.6 gm of a gas which occupies 2.24 litres at $0^oC$ & 760 mm pressure is :

Question 15 :
Mole ratio of $Fe$ in $FeO$, ${Fe}_{2}{O}_{3}$ and ${Fe}_{3}{O}_{4}$ samples of equal mass is:

Question 16 :
$0.3$ g of chloroplatinate of an organic diacidic base left $0.09$ g of platinum on ignition. The molecular weight (in g/mol) of the organic base is :

Question 17 :
Two elements $P$ (atomic weight $=75$) and $Q$ (atomic weight $=16$) combine to given a compound having $75.8\%$ of $P$. The formula of the compound is

Question 18 :
Under normal condition which of the following electronic configuration is able to form di-positive ion

Question 19 :
An ion carries the charge of $X^{3-}$, then the number of electrons in its valence shell is _____ .<br>

Question 20 :
A compound was found to contain 5.37% nitrogen. What is the minimum molecular weight of compound ?

Question 21 :
Number of atoms of iron present in $100$ g ${Fe}_{2}{O}_{3}$ having $20\%$ purity is:

Question 22 :
In an experiment, $1.0\, g\, CaCO_3$ on heating evolved 224 mL of $CO_2$ at NTP. What mass of $CaO$ (calcium oxide) is formed?

Question 25 :
Ratio of $C_P$ and $C_V$ of gas '$X$' is 1.4. The number of atoms of the gas '$X$' present in $11.2$ litres of at NTP will be:

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