Test Details

Atoms and Molecules

Feb 01, 8:00 PM

50 minutes

Feb 01, 8:50 PM

50.0 marks

MCQ

50 questions

Sonu classes

Professional

Class Details

Math

Physics

Chemistry

CLASS-IX (CBSE)

Math

Physics

Chemistry

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Question Text

Question 1 :
The sum of mass of all the atoms in a molecule is known as :

Question 3 :
The number of molecules present in $4.4$ g of $CO_{2}$ gas is:

Question 4 :
The formula of  stable binary compound which is formed by the combination of lithium and oxygen is ________.

Question 5 :
2 moles of chlorine atoms are present in_____g of chlorine gas.

Question 9 :
What is the molecular weight of$\displaystyle HCl{ O }_{ 4 }$?

Question 11 :
If true enter 1, if false enter 0. $12$ g carbon contains the same number of atoms as $32$ g of the sulphur has.

Question 13 :
Assertion: 1 mole $H_2SO_4$ contains same mass of oxygen and sulphur.   Reason: 1 mole $H_2SO_4$ represents 98 g mass.

Question 16 :
How many moles of calcium carbonate $(CaCO_3)$ are present in 20 g of the substance? ($Ca = 40,\ C = 12,\ O = 16$)

Question 18 :
The chemical formula of the compound containing carbon and oxygen is :

Question 20 :
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 22 :
Assertion: 1 g atom of $O_2$ and 1 g atom of $O_3$ have equal number of molecules. Reason: Mass of 1 mol atom is equal to its gram atomic mass.

Question 26 :
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 27 :
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 28 :
The molecular mass of $CuSO_4.5H_2O$ is:(Atomic mass of $Cu$ $=$ 63.5, $H$ $=$ 1, $O$ $=$ 16, $S$ $=$ 32)

Question 30 :
A solution containing one mole of a solute dissolved in $1000g$ of solvent is :

Question 33 :
How many atoms do make a piece of aluminium foil which has mass of 27 grams?

Question 34 :
One mole is equal to number of atoms as contained in:

Question 35 :
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 36 :
The number of moles of $H_{2}$ in $0.224$ L of hydrogen at STP is:

Question 37 :
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 38 :
The number of atoms in 0.1 mol of a triatomic gas is:

Question 40 :
Which of the following sample contains the maximum number of atoms?

Question 41 :
What volume of 0.232 N solution contains 3.17 milliequivalent of solute?

Question 42 :
The molecular mass of $(NH_4)_2CO_3$ is :Given atomic mass of H = 1, O = 16, C = 12, N = 14.

Question 43 :
The atomicity of a species is $x$ and its atomic weight is $y$. The molecular weight of the species is:

Question 44 :
Which quantity is needed to relate moles with the number of atoms?

Question 48 :
The molecular mass of $(NH_2)_2CO$ is :(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)

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