s-Block Elements · Chemistry · TS EAMCET
MCQ (Single Correct Answer)
A sample of water contains $\mathrm{Mg}\left(\mathrm{HCO}_3\right)_2$ and $\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2$ On boiling this water, these hydrogen carbonates are removed as precipitates. The precipitates are
Which of the following statements is not correct?
Identify the correct statement from the following
I. LiF is less soluble in water than NaF
II. Both LiCl and $\mathrm{MgCl}_2$ are insoluble in ethanol
III. Both Li and Mg form nitrides
IV. $\mathrm{Na}_2 \mathrm{CO}_3$ gives $\mathrm{CO}_2$ on heating
The major ingredient $(51 \%)$ in Portland cement is
How many of the following metals give oxides and nitrides when burnt in air?
Be, Na, Mg, Ba, Sr, Li, K
Identify the incorrect order against the property given in brackets
$$ \text { Match the following. } $$
| $$ \text { List I (Reactions) } $$ |
$$ \text { List II (Methods) } $$ |
||
|---|---|---|---|
| (A) | $$ \begin{aligned} \mathrm{Mg}\left(\mathrm{HCO}_3\right)_2 \longrightarrow \mathrm{Mg}(\mathrm{OH})_2 \downarrow & +2 \mathrm{CO}_2 \uparrow \end{aligned} $$ |
(I) | Clark's method |
| (B) | $$ \begin{array}{r} M^{2+}+\mathrm{Na}_4 \mathrm{P}_6 \mathrm{O}_{18}^{2-} \longrightarrow\left[\mathrm{Na}_2 \mathrm{MP}_6 \mathrm{O}_{18}\right]^{2-} +2 \mathrm{Na}^{+} \end{array} $$ |
(II) | Ion exchange method |
| (C) | $$ \begin{aligned} \mathrm{Ca}\left(\mathrm{HCO}_3\right)_2 & +\mathrm{Ca}(\mathrm{OH})_2 \longrightarrow 2 \mathrm{CaCO}_3+2 \mathrm{H}_2 \mathrm{O} \end{aligned} $$ |
(III) | Boiling |
| (D) | $$ \begin{gathered} 2 \mathrm{NaZ}+\mathrm{Ca}^{2+}(\mathrm{aq}) \longrightarrow 2 \mathrm{Na}^{+}+\mathrm{CaZ} (\mathrm{Z}=\text { Zeolite }) \end{gathered} $$ |
(IV) | Calgon's method |
The correct answer is
Observe the following statements.
Statement I Both LiF and CsI have low solubility in water.
Statement II Low solubility of LiF in water is due to smaller hydration enthalpy of ions and that of CsI is due to its high lattice enthalpy.
The correct answer is
In which of the following the $s$-block elements are arranged in the correct order of their melting points?
$$ \text { Match the following } $$
| $$ \text { Lis- I (Chemical) } $$ |
$$ \text { List-II (Use) } $$ |
||
|---|---|---|---|
| A. | KOH | I. | Coolant |
| B. | $\mathrm{Na}(l)$ | II. | Antacid |
| C. | Li | III. | Electrochemical cells |
| D. | $\mathrm{Mg}(\mathrm{OH})_2$ | IV | Absorbent for $\mathrm{CO}_2$ |
The correct answer is
When burnt in excess of oxygen, sodium forms a compound $X$ and potassium forms a compound $Y$. The magnetic natures of $X$ and $Y$ respectively are
Consider the following reactions.
$$ \begin{array}{r} \mathrm{Cs}+\mathrm{O}_2 \text { (excess) } \rightarrow X \\ \mathrm{Na}+\mathrm{O}_2 \rightarrow Y \end{array} $$
Identify the correct Statement about $X$ and $Y$
Choose the correct statement from the following.
I. In vapour phase $\mathrm{BeCl}_2$ exists as chlorobridge dimer.
II. $\mathrm{BeSO}_4$ is readily soluble in water.
III. BeO is completely basic in nature.
IV. $\mathrm{BeCO}_3$ being unstable, is kept in the atmosphere of $\mathrm{CO}_2$.
V. $\mathrm{BeCO}_3$ is less soluble among all the carbonates of group 2 elements.
Assertion (A) $\mathrm{MgO}, \mathrm{CaO}, \mathrm{SrO}$ and BaO are insoluble in water.
Reason ( R ) In aqueous medium the basic strength of $\mathrm{MgO}, \mathrm{CaO}, \mathrm{SrO}$ and BaO increases with increase in the atomic number of metal.
The correct option among the following is
Identify the incorrect reaction from the following.
The alkali metal with lowest $E^{\circ}{ }_{M^{+} / M}(\mathrm{~V})$ is $X$ and the alkali metal with highest $E^{\circ}{ }_{M^{+} / M}(\mathrm{~V})$ is $Y$. Then $X$ and $Y$ are respectively
Assertion (A) Be and Mg do not impart any colour to the flame.
Reason (R) The electrons in them are strongly bound to get excited by flame.
Which one of the following statements is not correct?
Thermal decomposition of lithium nitrate gives
Assertion (A) Alkali metals and their salts impart characteristic flame colours.
Reason (R) Alkali metals have low ionisation enthalpy values. So, electron excitation is possible. The correct option among the following is
Which of the following set of metals have strong tendency to form super oxides?
Identify the correct statements with respect to compounds of beryllium.
I. Beryllium oxide is amphoteric in nature.
II. Beryllium hydride is formed by the reaction of beryllium with hydrogen.
III. Beryllium hydride is formed by the reaction of beryllium chloride with lithium aluminium hydride.
IV. Beryllium sulpahte is the least soluble sulphate among the sulphates of alkaline earth metals.
Unknown inorganic compound ' $A$ ' is used for water softening. ' $A$ ' reacts with $\mathrm{Na}_2 \mathrm{CO}_3$ to generate an alkaline compound ' $B$ ' whose $\mathrm{pH}=14$. ' $A$ ' on reaction with $\mathrm{CO}_2$ gives cloudy ppt. ' $B$ ' +CaO reacts with unknown organic compound ' $C$ ' to give $\mathrm{C}_6 \mathrm{H}_6$. $A$, $B$ and $C$, respectively, are
The correct order of melting points of the following salts is
$$ \begin{array}{lll} \text { LiCl } & \text { LiF } & \text { Lil } \\ \text { I } & \text { II } & \text { III } \end{array} $$
Which of the following salts can accommodate more number of $\mathrm{H}_2 \mathrm{O}$ molecules per molecule in their halide hydrates?
Potassium superoxide on hydrolysis gives
Lithium nitrate on heating gives
Which of the following statement(s) are correct, when alkali metals burn in the presence of oxygen?
I. Lithium forms monoxide
II. Sodium forms peroxide
III. Potassium, rubidium and cesium forms superoxide
Which alkali metal emits blue colour light in flame test?
The carbonates of alkaline earth metals decompose on heating to give
I. $\mathrm{CO}_2$
II. Metal oxide
III. $\mathrm{H}_2 \mathrm{O}$
IV. CO
What is the increasing order of hydration enthalpies of alkali metal ions?
Which halide of alkaline earth metals is covalent in nature and can be soluble in organic solvent, such as ethanol?
Predict the feasibility of the given reactions in aqueous solution
(i) $\mathrm{Be}(\mathrm{OH})_2+2 \mathrm{OH}^{-} \longrightarrow\left[\mathrm{Be}(\mathrm{OH})_4\right]^{2-}$
(ii) $\mathrm{Be}(\mathrm{OH})_2+2 \mathrm{H}^{+} \longrightarrow\left[\mathrm{Be}(\mathrm{OH})_4\right]^{2+}$