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Variable valency is shown by which of the following elements?
Element that is not found in Free State is?
What is a complex/coordination compound?
PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:
11) Hydrogen has properties similar to:
Why transition metals have strong metallic bonding?
PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:
The periodic table consists of:
NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:
Hydrogen resembles the elements of groups:
NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
The formula of washing soda is:
NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:
By increasing which of the following factor polarizability increases?
PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:
Borax exists in nature as:
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
Triads were introduced by
The binding energy of transition metal increases upto group:
NUMS 2020
Chemistry
Periodicity in Elements
Elimination Tool:
Covalent hydrides are:
Boiling point of hydrides of the 4th period is larger than __________.
PMC Practice 2
Chemistry
Periodicity in Elements
Elimination Tool:
The false statement about lithium is:
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
Which of the following catalysts is used in the decomposition of laughing gas N2O at 1000 K?
2N2O 2N2 + O2
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
Metallic character of the elements:
NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
Which of the following is not the use of bleaching powder?
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
Arrange the following according to increasing ionization energy: Li, Be, Na, Mg
NUMS 2019 Cancelled
Chemistry
Periodicity in Elements
Elimination Tool:
Periodic table is divided into groups A and 6:
What are the products of the below-mentioned equation?
HNO3 +3HCI→
NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
ZnH2 is an example of?
NTS 2015 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
Ionic radius in period from left to right:
NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:
The products of decomposition of Mg(NO3)2are:
NUMS 2017
Chemistry
Periodicity in Elements
Elimination Tool:
Maximum ionization potential is of:
NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:
Magnesium oxide is used in the making of the lining of blast furnaces. It is extracted from seawater as follows. Aqueous calcium hydroxide is added to seawater.
Ca(OH)2 (aq) + MgCl2 (aq) + Mg(OH)2 (s) + CaCl2 (aq)
The magnesium hydroxide is then filtered off and roasted.
Which of the following comparisons between calcium and magnesium explains why magnesium hydroxide forms?
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
Within each pair of elements F & Cl, S & Se, and Li & Na respectively, the elements that release more energy upon an electron gain are:
PMC Sample 3
Chemistry
Periodicity in Elements
Elimination Tool:
Down’s cell is used to prepare:
NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
According to which phenomenon, “the properties of elements are the periodic function of their atomic number.”
NTS 2012
Chemistry
Periodicity in Elements
Elimination Tool:
Which statement is true about electron affinity?
NUMS 2020
Chemistry
Periodicity in Elements
Chemical Bonding
Elimination Tool:
Which of the following has maximum non-metallic character?
PMC Sample 2
Chemistry
Periodicity in Elements
Elimination Tool:
Which if the following has the greatest difference between it’s first and second ionization energies?
NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:
Which one of the following is acidic?
Hydration energy increases with
Which of the following statements about H2S is false?
NTS 2017
Chemistry
Periodicity in Elements
Elimination Tool:
Non-stoichiometric compounds are formed by:
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
Transition elements have coloured compounds because:
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
In Contact Process arsenic impurities act as poison for:
NUMS 2019 Reconduct
Chemistry
Periodicity in Elements
Elimination Tool:
NaNO3 on heating gives:
NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:
Which of the following statements are correct about noble gases?
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:
Metals usually produce hydrogen gas with acids. Which of the following produces hydrogen gas with NaOH?
What is the charge on a hydrogen ion?
P2O5 is Hygroscopic powder which sublimes at:
NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:
Who started the development of the First Periodic Table?
Which of the following elements has the lowest ionistion enthalpy?
PMC Sample 2
Chemistry
Periodicity in Elements
Elimination Tool:
Which of following pair has highest conductivity?
Which of the following has the least electron affinity value?
NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:
At the end of the periodic table _____ are found.
NTS 2016 DUHS & JSMU
Chemistry
Periodicity in Elements
Elimination Tool:
Number of elements in 6th period is:
Covalent character of hydrides decrease ________?
PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:
Smallest element in the periodic table is?
The chemical formula of Tincal is:
NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
Which orbitals take part in binding of transition elements
PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:
Whidi group has coinage metals?
7′ Period of the Periodic Table is:
In which of the following chromium has different oxidation state?
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
Which of the following has the highest ionization energy?
NUMS 2019 Cancelled
Chemistry
Periodicity in Elements
Elimination Tool:
Aqua regia can dissolve noble metal due to the formation of
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
The chemical formula of chromyl chloride gas is?
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
Ionization energy decreases down the group, from top to bottom, due to:
UHS 2019
Chemistry
Periodicity in Elements
Elimination Tool:
6th period of periodic table contains elements:
Hydrogen resembles with alkali metals in all respects except
NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:
The ionization energy increases from left to right in a period due to increase in?
PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:
A gas that reacts with CaO and not with NaHCO3 is:
NTS 2017
Chemistry
Periodicity in Elements
Elimination Tool:
Which group of elements shows greatest electrical conductivity?
Outer transition elements belong to
NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool: