iCON Education - s-Block Elements AP-EAPCET Test

In Solvay process, $\mathrm{NH}_3$ is recovered when the solution containing $\mathrm{NH}_4 \mathrm{Cl}$ is treated with compound ' $X$ '. What is ' $X^{\prime}$ ?

$\mathrm{Ca}(\mathrm{OH})_2$

Identify the correct statements from the following.

I. All alkaline earth metals give hydrides on heating with hydrogen.

II. Calcium hydroxide is used to purify sugar.

III. $\mathrm{BeCl}_2$ is a dimer in gaseous phase.

Identify the correct statement from the following.

A. Among alkali metal ions, $\mathrm{Li}^{+}$has highest hydration enthalpy.

B. Boiling point of alkali metals increases from Li to Cs .

C. Density of K is less than that of Na and Rb .

D. Li has strong tendency to form superoxide.

The correct answer is

Consider the following

Statement - I : Both $\mathrm{BeSO}_4$ and $\mathrm{MgSO}_4$ are readily soluble in water.

Statement - II : Among the nitrates of alkaline earth metals, only $\mathrm{Be}\left(\mathrm{NO}_3\right)_2$ on strong heating gives its oxide, $\mathrm{NO}_2$ and $\mathrm{O}_2$.

The correct answer is

Both Statement-I and Statement-II are correct.

Statement-I is correct, but Statement-II is not correct.

Statement-I is not correct, but Statement-II is correct.

Both statement-I and Statement-II are not correct.

Which chloride does not exist as hydrate?

The correct order of density of $\mathrm{Be}, \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr}$ is

$\mathrm{Sr}>\mathrm{Be}>\mathrm{Mg}>\mathrm{Ca}$

$\mathrm{Sr}>\mathrm{Ca}>\mathrm{Mg}>\mathrm{Be}$

$\mathrm{Be}>\mathrm{Mg}>\mathrm{Ca}>\mathrm{Sr}$

$\mathrm{Be}>\mathrm{Mg}>\mathrm{Sr}>\mathrm{Ca}$

Which of the following statements are correct regarding lithium and magnesium?

I. They react slowly with water.

II. Their bicarbonates are solids.

III. Their chlorides are not soluble in ethanol.

IV. Their nitrates decompose easily on heating.

The correct option is

Which of the following orders are correct against the stated property?

I. $\mathrm{NaO}_2<\mathrm{KO}_2<\mathrm{RbO}_2<\mathrm{CsO}_2$ - stability

II. $\mathrm{Mg}(\mathrm{OH})_2<\mathrm{Ca}(\mathrm{OH})_2<\mathrm{Sr}(\mathrm{OH})_2$ - basic strength

III. $\mathrm{MgCO}_3<\mathrm{CaCO}_3<\mathrm{SrCO}_3$ - thermal stability

Which of the following statement is incorrect with reference to alkaline earth metals?

Solubility of carbonates in water decreases down the group.

All the sulphates are thermally stable.

All the nitrates decompose on heating.

All halides are ionic in nature.

Which of the following, on thermal decomposition, form both acidic and basic oxides along with $\mathrm{O}_2$ ?

(i) $\mathrm{NaNO}_3$

(ii) $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2$

(iii) $\mathrm{Be}\left(\mathrm{NO}_3\right)_2$

(iv) $\mathrm{LiNO}_3$

The correct option is

Which one of the following alkali metals is the weakes reducing agent as per their $E^{\circ}$ values?

Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?

Which one of the following statements is not correct about the compounds of alkaline earth metals?

Basic nature increases from $\mathrm{Mg}(\mathrm{OH})_2$ to $\mathrm{Ba}(\mathrm{OH})_2$.

Thermal stability decreases from $\mathrm{BeCO}_3$ to $\mathrm{BaCO}_3$

Solubility of sulphates in water decreases from $\mathrm{BeSO}_4$ to $\mathrm{BaSO}_4$.

Nitrates of these on heating give oxides.

The correct order of density of $\mathrm{Be}, \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr}$ is

$\mathrm{Sr}>\mathrm{Be}>\mathrm{Mg}>\mathrm{Ca}$

$\mathrm{Be}>\mathrm{Mg}>\mathrm{Ca}>\mathrm{Sr}_r$

$\mathrm{Mg}>\mathrm{Ca}>\mathrm{Sr}>\mathrm{Be}$

$\mathrm{Ca}>\mathrm{Sr}>\mathrm{Be}>\mathrm{Mg}$

$\mathrm{Ba}, \mathrm{Ca}$ and Sr form halide hydrates. Their formulae are $\mathrm{BaCl}_2 \cdot x \mathrm{H}_2 \mathrm{O}, \mathrm{CaCl}_2 \cdot y \mathrm{H}_2 \mathrm{O} \cdot \mathrm{SrCl}_2 \cdot z \mathrm{H}_2 \mathrm{O}$. The value of $x, y, z$ respectively are

The correct order of decomposition temperature of $\mathrm{MgCO}_3(X), \mathrm{BaCO}_3(Y), \mathrm{CaCO}_3(Z)$ is

Identify the correct statements from the following.

(A) $\mathrm{BeSO}_4$ is soluble in water.

(B) BeO is an amphoteric oxide.

The pair of elements that form both oxides and nitrides, when burnt in air are

$\mathrm{Na}, \mathrm{Mg}$

$\mathrm{Na}, \mathrm{Be}$

$\mathrm{Mg}, \mathrm{Ca}$

$\mathrm{Be}, \mathrm{Mn}$

Assertion (A) MgSO$_4$ is readily soluble in water.

Reason (R) The greater hydration enthalpy of Mg$^{2+}$ ions overcome is lattice enthalpy.

A and R both are correct and R is the correct explanation of A .

A and R both are correct but R is not the correct explanation of A .

A is correct but R is not correct.

A is incorrect but R is correct.

Identify A and B from the following reaction,

$\mathrm{NaNO}_3 \xrightarrow{\Delta} x A+y B$

$\mathrm{NaNO}_2, \mathrm{O}_2$

$\mathrm{Na}_2 \mathrm{O}, \mathrm{NO}_2$

$\mathrm{Na}_2 \mathrm{O}, \mathrm{NO}$

$\mathrm{Na}, \mathrm{NO}_2$

The main constituent of enamel on the surface of teeth is

$\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2\right]$

$\left[\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{H}_2 \mathrm{O}\right]$

$\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$

Which of the following does not form double salts?

In the preparation of baking soda, H$_2$O and CO$_2$ in ratio ......... is used to react with Na$_2$CO$_3$.

Which metal oxide among the following gives H$_2$O$_2$ on treatment with dilute acid?

Assertion (A) K, Rb and Cs form superoxides.

Reason (R) The stability of superoxides increases from K to Cs due to decrease in lattice energy.

Both A and R are true and R is a correct explanation of A.

Both A and R are true but R is not a correct explanation of A.

A is true but R is false.

A is false but R is true.

When borax is dissolved in water, it gives an alkaline solution. The alkaline solution consists the following products

$\mathrm{NaOH}$ and $\mathrm{BH}_3$

$\mathrm{NaOH}$ and $\mathrm{H}_3 \mathrm{BO}_3$

$\mathrm{NaHCO}_3$ and $\mathrm{H}_3 \mathrm{BO}_3$

$\mathrm{Na}_2 \mathrm{CO}_3$ and $\mathrm{H}_3 \mathrm{BO}_3$