Question 2 : <span>The mass number of sulfur atom is:</span><div><br/><div><span>(Given: Atomic number = 16 and number of neutrons = 16)</span></div></div>
Question 4 :
The symbolic representation of one molecule of a compound is called ________.
Question 5 :
_____ are the basic units of matter and the defining structure of elements.
Question 6 :
Which one of the following properties of an element is not variable?<br>
Question 15 :
The sum of mass of all the atoms in a molecule is known as :
Question 18 :
Which of the following is used as standard for determination of atomic mass unit?
Question 22 :
_________ is the smallest unit of matter which may or may not have an independent existence, but always takes part in a chemical reaction.
Question 23 :
The symbolic representation of elements in a chemical compound is known as:
Question 29 :
A molecule formed by atoms of the same element is called a:<br/>
Question 31 : Consider the following statements:<br/>(a) Molecular mass of $CH_3OH$ is $32\ u.$<br/>(b) In $NH_3$, the ratio of $N$ and $H$ by mass is $14: 3.$<br/>(c) The formula mass of $CaCl_2$ is $ 111\ u.$<br/>(d) Isotopes have same mass number.<br/><br/><div>Which of the above statements are correct?</div>
Question 32 :
_________ deduced that all kind of matter are made up of "anu".
Question 33 :
Who thought that all materials were made of the four elements, earth, fire, water, and air?
Question 35 :
The net charge on the formula of a compound is always:
Question 36 :
<br/>The ratio of unpaired electrons present in d orbitals of $Co^{2+}$ and $Cr^{3+}$<span class="MathJax"><span class="MJX_Assistive_MathML">Co2+</span></span> is ____.
Question 38 :
The number of gold atoms in 300 mg of a gold ring of 20-carat gold ($Au = 197$: pure gold is 24 carat) is:
Question 39 :
$25\ g$ of $M{Cl}_{4}$ contains $0.5$ mole chlorine then its molecular weight is:
Question 40 :
If we assume that one-sixth the mass of an atom of $^{12}C$ isotope is taken as the reference, the mass of one molecule of oxygen will:
