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Practice each question, then open the answer or worked solution.
Hydrogen resembles halogens in many respects for which several factors are
responsible. Of the following factors which one is most important in this respect?
electronic configuration.
Option (ii) is the answer.
Why does H+ ion always get associated with other atoms or molecules?
small size as compared to other atoms or ions. Due to the small size, it cannot
exist free.
Option (iv) is the answer.
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH,
KH, RbH, CsH, the correct order of increasing ionic character is
Option (ii) is the answer.
Which of the following hydrides is electron-precise hydride?
Option (iv) is the answer.
Radioactive elements emit α, β and γ rays and are characterised by their halflives. The radioactive isotope of hydrogen is
Option (iii) is the answer.
Consider the reactions
(A) H2O2 + 2HI → I2 + 2H2O (B) HOCl + H2O2 → H3O++ Cl–+ O2
Which of the following statements is correct about H2O2 with reference to
these reactions? Hydrogen peroxide is ________.
Option (ii) is the answer.
The oxide that gives H2O2 on treatment with dilute H2SO4 is —
Option (ii) is the answer.
Which of the following equations depict the oxidising nature of H2O2?
Option (iii) is the answer.
Which of the following equation depicts reducing nature of H2O2?
Option (ii) is the answer.
Hydrogen peroxide is _________.
Option (iii) is the answer.