Problem 148
One mole of magnesium nitride on the reaction with an excess of water gives: (a) Two moles of ammonia (b) Two moles of nitric acid (c) One mole of ammonia (d) One mole of nitric acid
Problem 149
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? (a) \(\mathrm{LiCl}\) (b) \(\mathrm{NaCl}\) (c) \(\mathrm{KCl}\) (d) \(\mathrm{RbCl}\)
Problem 150
The following compounds have been arranged in the increasing solubilities. Identify the correct order. 1\. \(\mathrm{Be}(\mathrm{OH})_{2}\) 2\. \(\mathrm{Mg}(\mathrm{OH})_{2}\) 3\. \(\mathrm{Ca}(\mathrm{OH})_{2}\) 4\. \(\mathrm{Sr}(\mathrm{OH})_{2}\) 5\. \(\mathrm{Ba}(\mathrm{OH})_{2}\)
Problem 151
\(\mathrm{MgSO}_{4}\) on reaction with \(\mathrm{NH}_{4} \mathrm{OH}\) and \(\mathrm{Na}_{2} \mathrm{HPO}_{4}\) forms a white crystalline precipitate. What is its formula? (a) \(\mathrm{Mg}\left(\mathrm{NH}_{4}\right) \mathrm{PO}_{4}\) (b) \(\mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) (c) \(\mathrm{MgCl}_{2} \cdot \mathrm{MgSO}_{4}\) (d) \(\mathrm{MgSO}_{4}\)
Problem 152
Among the alkali metals, cesium is the most reactive because: (a) It has a single electron in the valence shell. (b) Its incomplete shell is nearest to the nucleus. (c) The outermost electron is more loosely bound than the outermost electron to the other alkali metals. (d) It is the heaviest alkali metal.
Problem 153
The increasing order of ionic character of CsF, LiI, \(\mathrm{NaBr}\) and \(\mathrm{KCl}\) is: (a) \(\mathrm{CaF}<\mathrm{KCl}<\mathrm{NaBr}<\mathrm{LiI}\) (b) \(\mathrm{NaBr}<\mathrm{KCl}<\mathrm{LiI}<\mathrm{CsF}\) (c) \(\mathrm{LiI}<\mathrm{KCl}<\mathrm{CsF}<\mathrm{NaBr}\) (d) \(\mathrm{LiI}<\mathrm{NaBr}<\mathrm{KCl}<\mathrm{CsF}\)
Problem 154
A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate respectively are: (a) \(\mathrm{Br}_{2}, \mathrm{KBrO}_{3}\) (b) \(\mathrm{Cl}_{2}, \mathrm{KClO}_{3}\) (c) \(\mathrm{I}_{2}, \mathrm{NaIO}_{3}\) (d) \(\mathrm{Cl}_{2}, \mathrm{NaClO}_{3}\)
Problem 157
\(\mathrm{A}+\mathrm{C}+\mathrm{Cl}_{2} \frac{\text { High temperature }}{\text { Of about } 1000 \mathrm{~K}} \mathrm{~B}+\mathrm{CO}\) \(\mathrm{B}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}+2 \mathrm{HCl}\) Compound \(\mathrm{B}\) is found in polymeric chain structure and is an electron deficient molecule. B must be: (a) \(\mathrm{BeCl}_{2}\) (b) \(\mathrm{BeO} \cdot \mathrm{Be}(\mathrm{OH})_{2}\) (c) \(\mathrm{Be}(\mathrm{OH})_{2}\) (d) \(\mathrm{BeO}\)
Problem 158
In the following sequence of reactions, identify the end product (D): (1) \(\mathrm{Na}_{2} \mathrm{CO}_{3} \stackrel{\mathrm{SO}_{2}}{\longrightarrow}\) (B) \(\stackrel{\mathrm{Na}_{2} \mathrm{CO}_{3}}{\longrightarrow}\) (C) Element \(\mathrm{S}, \Delta \rightarrow\) (D) \(\stackrel{I_{2}}{\longrightarrow}\) (a) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\) (c) \(\mathrm{Na}_{2} \mathrm{~S}\) (d) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\)
Problem 159
Identify the correct statements. (1) Beryllium liberates \(\mathrm{H}_{2}\) from \(\mathrm{HCl}\) or \(\mathrm{H}_{2} \mathrm{SO}_{4}\). (2) Beryllium is rendered passive on treatment with conc. \(\mathrm{HNO}_{3}\). (3) \(\mathrm{BeCl}_{2}\) has a polymeric structure in the solid state but exists as a dimmer in the vapour state. (4) \(\mathrm{BeCl}_{2}\) has a dimeric structure in the solid state but a polymeric structure in the vapour state. (a) 1,2 (b) 2,3 (c) \(1,2,3\) (d) \(2,3,4\)
