Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
How many of the following sulphates of metals dissolve in the water ? $ SrSO_4, K_2SO_4, BeSO_4, Li_2SO_4, MgSO_4, BaSO_4, Na_2SO_4, CaSO_4, Rb_2SO_4 $
$ 6 [K_2SO_4, BeSO_4, Li_2SO_4, MgSO_4, Na_2SO_4, Rb_2SO_4] $
How many of the following hydroxides is/are amphoteric in character ? $ CsOH, LiOH, Ca(OH)_2, Be(OH)_2, Mg(OH)_2, Sr(OH)_2, Ba(OH)_2, KOH, NaOH. $
$ 1 [Be(OH)_2] $
Out of Li, Na, K, Rb and Cs how many of them directly form superoxides on heating with oxygen ?
3[K, Rb, Cs]
Which of the following pairs of elements possess diagonal relationship ?
The pair of the compounds in which both the metals are in the highest possible oxidation state is
The oxidation states of various metals are : (a) Fe = + 3, Co + 3 (b) Cr = + 6 , Mn + 7 (c) Ti = + 6, Mn + 4 (d) Co = + 3, Mn + 6
Oxidation number of sodium in sodium amalgam is
In sodium amalgam, which is an alloy of sodium and mercury, the oxidation state of sodium is zero. This is because sodium loses its valence electron to mercury, forming a stable ionic compound where sodium has an oxidation state of +1 and mercury has an oxidation state of -1.
The valence electron in alkali metal is a [1990]
The outermost electrons in an atom are called valence electrons. In alkali metals (IA group) outermost electron is present in s-orbital. Alkali metals have one valence electron. e.g. Li, Na, K.
the tenth element in the periodic table resembles:
10 th element is neon, which is last element of 2nd period.
Which of the following order is not in accordance with the property stated against it ?
SInce size increases down the period , thus bond dissociation energy decreases, F2 is exception to this trend.
An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:
(c) Al2O3 are amphoteric oxides
Newland's Octaves Law -
Arranged the element in increasing order of their atomic weight and found that every eighth element had properties similar to that of the first element. Law of Octave was found to be true upto calcium.
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An element having configuration ns2 np1 will show +3 OS and its oxide nature will be that of its group i.e. Baron, Aluminium, etc.
therefore X2O3, and amphoteric nature. B2O3 is acidic , but tht is not in option , so only 3 is right ans.
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