Question 1 :
As one moves along a given row in the Periodic Table, ionisation energy
Question 2 :
The elements present in the core of earth are collectively known as
Question 3 :
The salt of an oxyacid of a metal $M$ contains one sulphur and four oxygen atoms. The valency of metal $M$ is:
Question 5 :
Valency of Boron in ${ BF }_{ 3 }$ molecules is _________.
Question 9 :
Which one of the following belongs to representative group of elements in the Periodic Table?
Question 10 : Among <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f8e9a3d2442ab8293076"> and <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f8eaa3d2442ab8293077"> the <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f7a6a3d2442ab8292d30"> has highest melting point because :
Question 11 :
The attraction that non-polar molecules have for each other is primarily caused by:
Question 14 :
The electrons present in the outermost shell of an atom are known as :
Question 17 :
Among the following compounds, which one is not responsible for the depletion of ozone layer?
Question 20 :
The statement that is true for the long form of the Periodic Table is
Question 21 : One would expect the elemental form of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f794a3d2442ab8292ccd"> at room temperature to be:
Question 23 :
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows highest magnetic momentum:
Question 26 :
A transition element has an electronic configuration such that 4s orbital has only one electron. Which of the following is correct?
Question 29 :
Assertion: The first ionization energy of Be is greater than that B.
Reason: 2p orbital is lower in energy than 2s.
Question 30 :
Calculate the number of electron present in valence shell of W.
Question 31 :
Choose the correct option and rewrite the statement.<br><br>The number of electrons in the outermost shell of alkali metal is __________.<br>
Question 32 :
The electronic configuration of actinides cannot be predicted with degree of certainty because of :<br/>
Question 34 :
The correct order in which the first ionisation potential increases is
Question 35 :
The single-bonded metallic radius of Na is 157 pm. What is the reasonable estimate of the radius of Na assuming that the increment between radii of different magnitudes is 60 pm?<br/>
Question 36 :
General electronic configuration of outermost and penultimate shell is $[Ne](n\,-\,1)\,s^2\,(n\,-\,1)\,p^6\,(n\,-\,1)\,d^{5}\,ns^2$. If $n = 4$, then the number of protons in the nucleus will be:
Question 37 :
An element belongs to the 3rd period and Group II of the periodic table.<br>Number of valence electrons are ______________.
Question 38 :
If Aufbau rule is not followed, $K-19$ will be placed in .................... block.
Question 39 :
What are the valencies of Si and Cl with atomic numbers 14 and 17 respectively?
Question 41 :
Which of the following does not have valence electron in 3d-subshell?
Question 42 : The electronic configuration is given as:<div><br/>$1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 3d^{10}\ 4s^2\ 4p^6\ 4d^{10}\ 5s^2$ is for:</div>
Question 43 :
The octet rule is not valid for which of the following molecules?
Question 45 :
Which of the following polyatomic ions does not have valency of $-1?$
Question 46 :
Atomic size ___________ in a period due to ______ in nuclear charge.<br/>
Question 47 :
The atoms of which of the following pair of element are most likely to exist in free state ?
Question 49 : The ionic radii of isoelectronic species <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f80ffdd8313cc87261b0"> are in the order?
Question 50 :
An element $'X'$ has $18$ electrons in $'M'$ shell and $1$ electron in $'N'$ shell which is the valence shell.$ 'X'$ belongs to:<br/>
Question 51 :
If an element A is present in group I of the periodic table, the formula of its chloride should be :
Question 53 :
The electronic configuration of an atom $A$ is $1s^2 2s^2 2p^6 3s^2p^6 3d^{10} 4s^2 4p^3$. The chemistry of $A$ is therefore likely to be similar to that of 
Question 54 :
How does number of valence electrons vary on moving from left to right In the second period of a periodic table ?
Question 55 :
Which of the following elements will have highest second ionisation enthalpy?
Question 56 :
The valency of Cr in the complex $\left[ \mathrm { Cr } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 4 } \mathrm { Cl } _ { 2 } \right] ^ { + }$
Question 57 :
The oxidation state of Barium in $Ba({ H }_{ 2 }{ PO }_{ 2 }{ ) }_{ 2 }$  is:
Question 58 :
Assertion: Transition metals show variable valence.
Reason: Due to a large energy difference between the $ ns^2 $ and $ ( n - 1)d $ electrons.
Question 59 :
$0.7\ g$ of $Na_{2}CO_{3}. xH_{2}O$ is dissolved in $100\ ml, 20\ ml$ of which required $19.8\ ml$ of $0.1\ N\ HCl$. The value of $x$ is:
Question 60 :
Among cellulose, polyvinyl chloride, nylon and natural rubber, in which of the polymer intermolecular force of attraction is weakest?
