Test Details

Structure of the Atom

Chem

Jan 22, 7:00 PM

50 minutes

Jan 22, 7:50 PM

50.0 marks

MCQ

31 questions

Shahid Hussain

Adaptive and blank

Class Details

Science &Maths

Class 9

Science &Maths

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Question Text

Question 1 :
While revolving in discrete orbits the electrons do not radiate energy. These orbits or shells are called .................. 

Question 2 :
The salt of an oxyacid of a metal $M$ contains one sulphur and four oxygen atoms. The oxyacid of the salt is:

Question 4 :
Maximum number of electrons that can be accomodated in a shell (in general) is given by the formula

Question 6 :
The fundamental particle which has no charge and has mass almost equal to that of positively charged fundamental particle is ..............

Question 12 :
In which of the following pairs do the two species resemble each other most closely in chemical properties?<br>

Question 13 :
Isotopes of iodine _______ is used in the treatment of goiter.

Question 14 :
A sample of carbon atoms is found to contain atoms that have mass numbers of $12$, $13$ and $14$. Which statement best describes how this is possible?

Question 20 :
An element with mass number 81 contains 31.7% more neutrons as compared to protons. Find the symbol of the atom.

Question 22 :
Statement 1 : The atomic number of a neutral atom that has a mass of $39$ and has $19$ electrons is $19$.<br/>Statement 2: The number of protons in a neutral atom is equal to the number of electrons.

Question 23 :
The fundamental particle(s) not present in the nucleus of hydrogen atom is :

Question 24 :
Which of the following compounds does not follow the octet rule for electron distribution?

Question 25 :
Which of the following does not have valence electron in 3d-subshell?

Question 27 :
The number of electrons and neutrons of an element is $18$ and $20$ respectively. its mass number is :

Question 29 :
Which of the following postulates does not belong to Bohr's model of the atom?

Question 30 :
The motion of a particle along a straight line is described by equation $x= 8 + 12t - { t }^{ 3 }$ where, $x$ is in metre and $t$ in sec. The retardation of the particle when its velocity becomes zero is :

Question 31 :
From Bohr's model radius of the orbit and energy of the hydrogen atom are calculated as:

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