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The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]
The volume of 0.25 moldm-3 solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00)
Consider the reaction represented by the following equation: C\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\). The value of y in the reaction is
Which of the following statements about nuclear reaction is correct? The reaction
Noble gas molecules are held together by
Which of the following elements is diatomic?
The bonds in crystalline ammonium chloride are
In metallic solid, the forces of attraction is between the mobile valence electrons and the
Which of the following bond types is responsible for the high boiling point of water?
In which of the following series are the atoms arranged in order of increasing ionization energy?
Rare gases are stable because they
Which of the following halogens is liquid at room temperature?
In the periodic table all elements within the same group have the same
The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to
Which of the following arrangements represents the correct order of electronic energy level?
Which of the following statements is correct?
An atom of an element X gains two electrons. The symbol of the ion formed is
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
The molecule which has a linear shape is