Chemistry Ch 1 Class 12 Elements and Periodicity





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NaNO3 on heating gives:

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The false statement about lithium is:

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The binding energy of transition metal increases upto group:

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ZnH2 is an example of?

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Which group of elements shows greatest electrical conductivity?

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Triads were introduced by

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What are the products of the below-mentioned equation?

HNO3 +3HCI→

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Ionic radius in period from left to right:

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Hydration energy increases with

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Which orbitals take part in binding of transition elements

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Which one of the following is acidic?

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Ionization energy decreases down the group, from top to bottom, due to:

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The chemical formula of chromyl chloride gas is?

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Transition elements have coloured compounds because:

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The chemical formula of Tincal is:

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Which statement is true about electron affinity?

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Arrange the following according to increasing ionization energy: Li, Be, Na, Mg

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What is a complex/coordination compound?

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Why transition metals have strong metallic bonding?

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Which of the following catalysts is used in the decomposition of laughing gas N2O at 1000 K?

2N2O 2N2 + O2

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Aqua regia can dissolve noble metal due to the formation of

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Periodic table is divided into groups A and 6:

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Metals usually produce hydrogen gas with acids. Which of the following produces hydrogen gas with NaOH?

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6th period of periodic table contains elements:

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Which of the following has the highest ionization energy?

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Maximum ionization potential is of:

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The ionization energy increases from left to right in a period due to increase in?

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According to which phenomenon, “the properties of elements are the periodic function of their atomic number.”

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The products of decomposition of Mg(NO3)2are:

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Borax exists in nature as:

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Whidi group has coinage metals?

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Who started the development of the First Periodic Table?

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Covalent hydrides are:

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What is the charge on a hydrogen ion?

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Which of the following statements about H2S is false?

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By increasing which of the following factor polarizability increases?

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Hydrogen resembles with alkali metals in all respects except

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At the end of the periodic table _____ are found.

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Outer transition elements belong to

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In Contact Process arsenic impurities act as poison for:

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Down’s cell is used to prepare:

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Which if the following has the greatest difference between it’s first and second ionization energies?

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Hydrogen resembles the elements of groups:

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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?

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Variable valency is shown by which of the following elements?

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Which of the following statements are correct about noble gases?

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Within each pair of elements F & Cl, S & Se, and Li & Na respectively, the elements that release more energy upon an electron gain are:

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Which of the following has maximum non-metallic character?

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Which of the following has the least electron affinity value?

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Which of the following elements has the lowest ionistion enthalpy?

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A gas that reacts with CaO and not with NaHCO3 is:

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Element that is not found in Free State is?

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Covalent character of hydrides decrease ________?

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The periodic table consists of:

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P2O5 is Hygroscopic powder which sublimes at:

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7′ Period of the Periodic Table is:

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The formula of washing soda is:

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11) Hydrogen has properties similar to:

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Which of the following is not the use of bleaching powder?

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In which of the following chromium has different oxidation state?

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Boiling point of hydrides of the 4th period is larger than __________.

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Non-stoichiometric compounds are formed by:

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Which of following pair has highest conductivity?

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Number of elements in 6th period is:

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Metallic character of the elements:

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Smallest element in the periodic table is?

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