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Atoms and Molecules

Dec 04, 8:14 PM

120 minutes

Dec 10, 9:00 PM

50.0 marks

MCQ

50 questions

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Question Text

Question 1 :
Cations are formed by ____ (loss/ gain) of electrons and anions are formed by______ (loss/ gain) of electrons.

Question 2 :
The symbolic representation of one molecule of a compound is called ________.

Question 6 :
Assertion: 23 g of sodium has $6.022 \times 10^{23}$ atoms sodium. Reason: Number of atoms in the given mass of sodium cannot be determined

Question 7 :
Which of the following expressions is correct ? ($n$ = number of moles of the gas, $N_A$ = Avogadro constant. $m$ = mass of 1 molecule of the gas. $N$ = number of molecules of the gas) 

Question 8 :
One mole is equal to number of atoms as contained in:

Question 10 :
How many atoms do make a piece of aluminium foil which has mass of 27 grams?

Question 11 :
Which of the following attains the stable electronic configuration as argon?

Question 13 :
Hot aluminium reacts vigorously with chlorine gas to form a compound which sublimes readily. Give the formula of the compound formed.

Question 14 :
An element $X$ combines with oxygen to form an oxide ${X}_{2}O$. This oxide is electrically conducting. How many electrons would be there in the outermost shell of the element $X$?

Question 15 :
Which of the following electrons take part in a chemical reaction?

Question 18 :
The valency of an element A is 4 and that of another element B is 2. The formula of the compound formed from A and B is $A_2B.$

Question 21 :
The molecular mass of $(NH_4)_2CO_3$ is :Given atomic mass of H = 1, O = 16, C = 12, N = 14.

Question 23 :
Which quantity is needed to relate moles with the number of atoms?

Question 24 :
2 moles of chlorine atoms are present in_____g of chlorine gas.

Question 25 :
The chemical formula of the compound containing carbon and oxygen is :

Question 26 :
The molecular mass of $CuSO_4.5H_2O$ is:(Atomic mass of $Cu$ $=$ 63.5, $H$ $=$ 1, $O$ $=$ 16, $S$ $=$ 32)

Question 29 :
A solution containing one mole of a solute dissolved in $1000g$ of solvent is :

Question 33 :
What is the molecular weight of$\displaystyle HCl{ O }_{ 4 }$?

Question 34 :
Which of the following is a wrong representation of atom and it's ion?

Question 38 :
Assertion: 1 mole $H_2SO_4$ contains same mass of oxygen and sulphur.   Reason: 1 mole $H_2SO_4$ represents 98 g mass.

Question 40 :
The number of molecules present in $4.4$ g of $CO_{2}$ gas is:

Question 42 :
The number of charges on an ion formed by a non-metal is :

Question 45 :
The number of grams of anhydrous $Na_2CO_3$ present in 250 mL of 0.25 M solution is:

Question 46 :
Which of the following sample contains the maximum number of atoms?

Question 48 :
The sum of mass of all the atoms in a molecule is known as :

Question 49 :
Magnesium with atomic number 12 attains the stable electronic configuration of the nearest noble gas :

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