Test Details

Atoms and Molecules,Structure Of The Atom

Jan 27, 9:00 PM

1440 minutes

Jan 28, 9:00 PM

60.0 marks

MCQ

30 questions

rajat verma

Electronics engineer

Class Details

Science

Class 9th

Science

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Question Text

Question 6 :
What is the SI prefix for $10^{-1}$ multiples and submultiples of a unit?

Question 10 :
What is the fraction of the mass of water due to neutrons?

Question 13 :
Formula of sodium carbonate is ______ and that of ammonium sulphate is ______.

Question 14 :
Give the formulae of the compounds formed from carbon and oxygen.

Question 16 :
State true or false: Helium atom has 2 electrons in its valence shell but its valency is not 2.

Question 18 :
Which of the following is true for an element? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic mass = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons.

Question 20 :
Calculate the number of neutrons present in the nucleus of an element X which is represented as $_{15}^{31}X$.

Question 22 :
Is it possible for the atom of an element to have one electron, one proton and no neutron. (Yes/No)

Question 23 :
In a sample of ethyl ethanoate ($CH_{3}COOC_{2}H_{5}$) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

Question 24 :
Is it possible for the atom of an element to have one electron, one proton and no neutron. (Yes/No)

Question 25 :
Calculate the number of neutrons present in the nucleus of an element X which is represented as $_{15}^{31}X$.

Question 27 :
Which of the following element has an atom with one electron, one proton and no neutron ?

Question 28 :
Which of the following scientist identified the 'Canal rays' in the structure of an atom ?

Question 29 :
Which of the following correctly represent the electronic distribution in the Mg atom?

Question 30 :
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

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