Problem 103
Which of the following has lowest thermal stability? (a) \(\mathrm{BeCO}_{3}\) (b) \(\mathrm{MgCO}_{3}\) (c) \(\mathrm{CaCO}_{3}\) (d) \(\mathrm{BaCO}_{3}\)
Problem 104
The ionic conductance of following cations in a given concentration is in the order: (a) \(\mathrm{Li}^{+}>\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\) (b) \(\mathrm{Li}^{+}=\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\) (c) \(\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}\) (d) \(\mathrm{Li}^{+}<\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\)
Problem 105
A sodium salt on treatment with \(\mathrm{MgCl}_{2}\) gives white precipitate only on heating. The anion of the sodium salt is: (a) \(\mathrm{HCO}_{3}^{-}\) (b) \(\mathrm{CO}_{3}^{2-}\) (c) \(\mathrm{NO}_{3}^{-}\) (d) \(\mathrm{SO}_{4}{ }^{2-}\)
Problem 106
Gas 'A' is bubbled through slaked lime when a white precipitate is formed, on prolonged bubbling the precipitategets dissolved. On heating the resultant solution, the white precipitate reappeared with solution of gas 'B'. The gases 'A' and 'B' respectively are: (a) \(\mathrm{CO} \& \mathrm{CO}_{2}\) (b) \(\mathrm{CO}_{2} \& \mathrm{CO}_{2}\) (c) \(\mathrm{CO} \& \mathrm{CO}\) (d) \(\mathrm{CO}_{2} \& \mathrm{CO}\)
Problem 108
When \(\mathrm{K}_{2} \mathrm{O}\) is added to water, the solution is basic because it contains a significant concentration of: (a) \(\mathrm{OH}^{-}\) (b) \(\mathrm{K}^{+}\) (c) \(\mathrm{O}^{3-}\) (d) \(\mathrm{O}_{2}^{2-}\)
Problem 109
Which of the following statement is correct for \(\mathrm{CsBr}_{3} ?\) (a) It is a covalent compound (b) It contains \(\mathrm{Cs}^{3+}\) and \(\mathrm{Br}^{-}\) ions (c) It contains \(\mathrm{Cs}^{+}\) and \(\mathrm{Br}_{3}^{-}\) ions (d) It contains \(\mathrm{Cs}^{+}, \mathrm{Br}^{-}\) and lattice \(\mathrm{Br}_{2}\) molecule
Problem 110
A mixture of sodium oxide and calcium oxide are dissolved in water and saturated with excess carbon dioxide gas. The resulting solution is \(\ldots \ldots \ldots \ldots\) It contains ..... (a) Acidic \(\mathrm{NaOH}\) and \(\mathrm{CaCO}_{3}\) (b) Basic \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (c) Neutral \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (d) Basic \(\mathrm{NaOH}\) and \(\mathrm{Ca}(\mathrm{OH})_{2}\)
Problem 111
A certain metal \(\mathrm{M}\) is used to prepare an antacid, which is used as a medicine for acidity. This metal accidently catches fire, which can no be extinguished by using \(\mathrm{CO}_{2}\) based extinguishers. The metal \(\mathrm{M}\) is: (a) \(\mathrm{Mg}\) (b) \(\mathrm{Ba}\) (c) \(\mathrm{Be}\) (d) \(\overline{\mathrm{C}}\)
Problem 112
Consider the following abbreviations for hydrated alkali ions: \(\mathrm{X}=\left[\mathrm{Li}\left(\mathrm{H}_{2} \mathrm{O}\right)_{\mathrm{n}}\right]^{+} \quad \mathrm{Y}=\left[\mathrm{K}\left(\mathrm{H}_{2} \mathrm{O}\right)_{\mathrm{n}}\right]^{+}\) \(\mathrm{Z}=\left[\mathrm{Cs}\left(\mathrm{H}_{2} \mathrm{O}\right)_{\mathrm{n}}\right]^{+}\) Which of the correct order of size of these hydrated alkali ions? (a) \(Z>X>Y\) (b) \(\mathrm{X}=\mathrm{Y}=\mathrm{Z}\) (c) \(\mathrm{X}>\mathrm{Y}>\mathrm{Z}\) (d) \(Z>Y>X\)
Problem 113
Out of the following metals that cannot be obtained by electrolysis of the aqueous solution of their salts are: 1\. Ag 2\. \(\mathrm{Mg}\) 3\. \(\mathrm{Cu}\) 4\. Al (a) 2,4 (b) 2,3 (c) 1,4 (d) All
