Test Details

Atom And Molecules

Test

Nov 22, 7:00 PM

120 minutes

Nov 22, 9:00 PM

50.0 marks

MCQ

50 questions

manish sahu

MTECH (IIT DELHI)

Class Details

Maths

Science

9th

Maths

Science

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Question Text

Question 1 :
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 2 :
How many atoms are represented in$\displaystyle { Na }_{ 2 }{ CO }_{ 3 }\cdot 10{ H }_{ 2 }O$

Question 3 :
The number of charges on an ion formed by a metal is :

Question 5 :
The number of moles of $H_{2}$ in $0.224$ L of hydrogen at STP is:

Question 6 :
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 7 :
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 8 :
The symbolic representation of one molecule of a compound is called ________.

Question 9 :
The strong electrostatic forces of attraction between oppositely charged ions are called ______

Question 17 :
Which of the following is a wrong representation of atom and it's ion?

Question 19 :
The molecular mass of $(NH_4)_2CO_3$ is :Given atomic mass of H = 1, O = 16, C = 12, N = 14.

Question 20 :
The sodium salt of unknown action, when treated with $CaCl_{2}$, gives white precipitate only on boiling. The anion is:

Question 21 :
Compound A on strong heating in a boiling tubegives off reddish brown fumes and a yellow residue with a few drops of sodium hydroxide solution, a white precipitate appeared. Identify the cation and anion present in the compound A.

Question 23 :
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 29 :
A salt of binary acid $H_2S$ is $MS$. Then the valency of metal $M$ is 2.

Question 32 :
The atomicity of a species is $x$ and its atomic weight is $y$. The molecular weight of the species is:

Question 33 :
Atoms will gain or lose electrons depending on which action takes the :

Question 35 :
Which of the following attains the stable electronic configuration as argon?

Question 41 :
The number of atoms in 0.1 mol of a triatomic gas is:

Question 42 :
2 moles of chlorine atoms are present in_____g of chlorine gas.

Question 45 :
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 47 :
The formula of  stable binary compound which is formed by the combination of lithium and oxygen is ________.

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