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question_answer1)
1 u or 1 amu means
A)
1/12th mass of C-12 atoms done
clear
B)
Mass of C-12 atom done
clear
C)
Mass of O-16 atom done
clear
D)
Mass of Hydrogen molecule done
clear
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question_answer2)
Which is the symbol of the element tungsten? [NDA]
A)
Ta done
clear
B)
Tc done
clear
C)
W done
clear
D)
V done
clear
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question_answer3)
What is the mass (in grams) of 3 moles of N?
A)
14 done
clear
B)
28 done
clear
C)
42 done
clear
D)
56 done
clear
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question_answer4)
The number of molecules in one mole of a gas is
A)
\[6.023\times {{10}^{23}}\] done
clear
B)
\[6.023\times {{10}^{22}}\] done
clear
C)
\[6.023\times {{10}^{21}}\] done
clear
D)
\[6.023\times {{10}^{20}}\] done
clear
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question_answer5)
Valency of Cr in \[CrP{{O}_{4}}\] is
A)
4 done
clear
B)
3 done
clear
C)
2 done
clear
D)
1 done
clear
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question_answer6)
Which of the following are the constituents of matter?
A. Atoms |
B. Molecules |
C. Solid |
A)
A and B only done
clear
B)
A and C only done
clear
C)
B and C only done
clear
D)
A, B and C done
clear
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question_answer7)
The number value \[6.022\text{ }\times \text{1}{{\text{0}}^{23}}\] is also called
A)
Dalton Number done
clear
B)
Avagadro's number done
clear
C)
Atomic Number done
clear
D)
Mass Number done
clear
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question_answer8)
The molecular formula \[{{P}_{2}}{{O}_{5}}\] means that
A)
a molecule contains 2 atoms of P and 5 atoms of O done
clear
B)
the ratio of the mass of P to the mass of O in the Molecules is 2:5 done
clear
C)
there are twice as many P atoms in the molecule as there are O atoms done
clear
D)
the ratio of the mass of P to the mass of 0 in the molecule is 5 : 2 done
clear
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question_answer9)
What mass of hydrogen and oxygen will be produced on complete electrolysis of 18g of water?
A)
2g hydrogen and 32g oxygen done
clear
B)
2g hydrogen and 16g oxygen done
clear
C)
4g hydrogen and 32g oxygen done
clear
D)
4g hydrogen and 14g oxygen done
clear
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question_answer10)
Which of the following statements is /are correct? According to Dalton's theory
A. An atom is the smallest particle of matter |
B. An atom is the smallest particle of an element |
C. An atom is the smallest indivisible particle of an element that can take part in a chemical change |
D. An atom is the radioactive emission |
A)
A, B, and C done
clear
B)
B, C and D done
clear
C)
A, C and D done
clear
D)
A and D done
clear
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question_answer11)
Which one among the following statements about an atom is not correct? [CDS]
A)
Atoms always combine to form molecules done
clear
B)
Atoms are the basic units from which molecules and ions are formed done
clear
C)
Atoms are always neutral in nature done
clear
D)
Atoms aggregate in large numbers to form the matter that we can see, feel and touch done
clear
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question_answer12)
Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]? [CDS]
A)
They are isomers of each other done
clear
B)
They are isotopes of each other done
clear
C)
They are isoelectronic with each other done
clear
D)
All of the above done
clear
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question_answer13)
Which of the following pairs is/are correctly matched? [NDA]
1. Isotopes: Atoms with same atomic number but different atomic mass |
2. Isobars: Atoms with same number of neutrons but different atomic number |
3 Isotones: Atoms with same mass number but different atomic number |
Select the correct answer using the code given below: |
Code:
A)
1, 2 and 3 done
clear
B)
1 only done
clear
C)
1 and 2 only done
clear
D)
2 only done
clear
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question_answer14)
The nucleus of a singly ionized carbon atom contains [NDA]
A)
6 protons and 6 neutrons done
clear
B)
5 protons and 6 neutrons done
clear
C)
6 protons, 6 neutrons and 6 electrons done
clear
D)
12 protons, 6 neutrons and 6 electrons done
clear
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question_answer15)
The following questions consist of two statements, one labelled as the Assertion [A] and the other as Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below: [NDA]
Assertion [A]: Atomic weights of most of the elements are not whole numbers. |
Reason (R): Atoms of most of the elements contain mixture of isotopes having different atomic weights. |
A)
Both A and R are individually true and R is the correct explanation of A done
clear
B)
Both A and R are individually true but R is NOT the correct explanation of A done
clear
C)
A is true but R is false done
clear
D)
A is false but R is true done
clear
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question_answer16)
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound? [NDA]
A)
14 done
clear
B)
15 done
clear
C)
22 done
clear
D)
23 done
clear
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question_answer17)
What is the weight of one atom of Hydrogen in grams? [NDA]
A)
\[6.023\text{ }\times \text{1}{{\text{0}}^{-23}}\] done
clear
B)
\[1.66\text{ }\times \text{1}{{\text{0}}^{-24}}\] done
clear
C)
\[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\] done
clear
D)
None of these done
clear
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question_answer18)
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard? [NDA]
A)
\[^{1}{{H}_{1}}\] done
clear
B)
\[^{12}{{C}_{6}}\] done
clear
C)
\[^{16}{{O}_{8}}\] done
clear
D)
\[^{35}C{{I}_{17}}\] done
clear
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question_answer19)
What is the number of water molecules present in a tiny drop of water (volume 0.0018 ml) at room temperature? [NDA]
A)
\[4.84\times {{10}^{17}}\] done
clear
B)
\[4.184\times {{10}^{18}}\] done
clear
C)
\[6.023\times {{10}^{19}}\] done
clear
D)
\[6.023\times {{10}^{23}}\] done
clear
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question_answer20)
The number of neutrons in \[_{7}A{{I}^{27}}\] is [NDA]
A)
40 done
clear
B)
27 done
clear
C)
14 done
clear
D)
13 done
clear
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question_answer21)
The nucleus of a singly ionized carbon atom contains [NDA]
A)
6 protons and 6 neutrons done
clear
B)
5 protons and 6 neutrons done
clear
C)
6 protons, 6 neutrons and 6 electrons done
clear
D)
12 protons, 6 neutrons and 6 electrons done
clear
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question_answer22)
An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon? [NDA]
A)
12 done
clear
B)
6 done
clear
C)
10 done
clear
D)
14 done
clear
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question_answer23)
What is the number of mole(s) of \[{{H}_{2}}\](g) required to saturate one mole benzene? [NDA]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
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question_answer24)
How many moles of hydrogen atom are present in one mole of Aluminium hydroxide? [NDA]
A)
One mole done
clear
B)
Two moles done
clear
C)
Three moles done
clear
D)
Four moles done
clear
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question_answer25)
Protons and neutrons are bound in a nucleus by the [NDA]
A)
short range 'weak interaction' done
clear
B)
short range 'strong interaction' done
clear
C)
long range 'electromagnetic interaction' done
clear
D)
long range 'gravitational interaction' done
clear
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question_answer26)
Which one among the following most correctly determines the atomic number of an element [NDA]
A)
Number of protons done
clear
B)
Number of protons and electrons done
clear
C)
Number of ions done
clear
D)
Number of nucleons done
clear
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question_answer27)
The number of protons in a negatively charged atom (anion) is [NDA]
A)
more than the atomic number of the element done
clear
B)
less than the atomic number of the element done
clear
C)
more than the number of electrons in the atom done
clear
D)
less than the number of electrons in the atom done
clear
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question_answer28)
Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]? [NDA]
A)
They are isomers of each other done
clear
B)
They are isotopes of each other done
clear
C)
They are isoelectronic with each other done
clear
D)
All of the above done
clear
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question_answer29)
Which of the following pairs is/are correctly matched? [NDA]
1. Isotopes: Atoms with same atomic number but different atomic mass
|
2. Isobars: Atoms with same number of neutrons but different atomic number
|
3. Isotones: Atoms with same mass number but different atomic number.
|
Select the correct answer using the code given below:
|
Code:
A)
1, 2 and 3 done
clear
B)
1 only done
clear
C)
1 and 2 only done
clear
D)
2 only done
clear
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question_answer30)
Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength? [NDA]
A)
n = 2 to n = 1 done
clear
B)
n = 3 to n = 2 done
clear
C)
n = 4 to n = 3 done
clear
D)
n = 5 to n = 4 done
clear
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question_answer31)
Match List I with List II and select the correct answer using the code given below the Lists : [NDA]
|
List I (Scientist) |
|
List II (Discovery) |
A. |
Goldstein |
1. |
Atomic theory |
B. |
Chadwick |
2. |
Proton |
C. |
J.J Thomson |
3. |
Neutron |
D. |
John Dalton |
4. |
Electron |
A)
A-2, B-3, C-4, D-1 done
clear
B)
A-2, B-4, C-3, D-1 done
clear
C)
A-1, B-4, C-3, D-2 done
clear
D)
A-1, B-3, C-4, D-2 done
clear
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question_answer32)
Which formula gives the maximum number of electrons in a shell?
A)
\[{{n}^{2}}\] done
clear
B)
\[2{{n}^{2}}\] done
clear
C)
\[3{{n}^{2}}\] done
clear
D)
\[4{{n}^{2}}\] done
clear
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question_answer33)
In which one of the following is the valence electronic configuration, \[n{{s}^{2}}n{{p}^{3}}\] found? [NDA]
A)
Carbon done
clear
B)
Oxygen done
clear
C)
Nitrogen done
clear
D)
Argon done
clear
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question_answer34)
Which of the following isotopes of carbon is/are used in carbon dating? [CDS]
A)
\[_{6}{{C}^{12}}\] only done
clear
B)
\[_{6}{{C}^{13}}\] only done
clear
C)
\[_{6}{{C}^{14}}\] only done
clear
D)
\[_{6}{{C}^{12}}\] and \[_{6}{{C}^{14}}\] done
clear
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question_answer35)
An \[\alpha \]-particle consists of which of the following? [CDS]
A)
2 protons and 2 neutrons done
clear
B)
1 proton and 1 electron done
clear
C)
2 protons and 4 neutrons done
clear
D)
1 proton and 1 neutron done
clear
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question_answer36)
Which one of the following is heavy water used in nuclear reactor? [CDS]
A)
Water having molecular weight 18 u done
clear
B)
Water having molecular weight 20 u done
clear
C)
Water at \[4{}^\circ C\] but having molecular weight 19u done
clear
D)
Water below the ice in a frozen sea done
clear
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question_answer37)
Which one of the following is not needed in a nuclear fission reactor? [CDS]
A)
Moderator done
clear
B)
Coolant done
clear
C)
Accelerator done
clear
D)
Control device done
clear
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question_answer38)
Heavy water implies [CDS]
A)
water which is used in heavy industries such as thermal power plants done
clear
B)
water which contains \[S{{O}_{4}}^{2-}\] and \[C{{I}^{-}}\] of calcium and magnesium done
clear
C)
deuterated water done
clear
D)
water which has maximum density done
clear
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question_answer39)
Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are [CDS]
A)
C-12 and C-13 done
clear
B)
C-13 and C-14 done
clear
C)
C-12 and C-14 done
clear
D)
C-12 and carbon black done
clear
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question_answer40)
Which one of the following reactions is the main cause of the energy radiation from the Sun? [CDS]
A)
Fusion reaction done
clear
B)
Fission reaction done
clear
C)
Chemical reaction done
clear
D)
Diffusion reaction done
clear
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