S-block elements practice · Medium

$N{a_2}{O_2}$ has light yellow colour. This is due to

Which compound will not give positive $\mathrm{NaHCO}_3$ test?

Which one of the following hydroxide is insoluble in water?

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is:

Portland cement contains ' $X$ ' to enhance the setting time. What is ' $X$ '?

Electric cookers have a coating of ….that protects them against fire.

Potassium when heated strongly in oxygen, it forms

Sedimentary rocks laid down under water mainly contain:

The alkaline earth metal nitrate that does not crystallise with water molecules, is

The product(s) formed when $\mathrm{Mg}$ reacts with $\mathrm{SO}_2$ is/are

The primary standard solution for estimation of $\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}$ is

$A\mathrm{and}B$ are two salts. $A$ with dilute $\mathrm{HCl}$ and $B$ with conc. ${\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}$ react to give reddish brown vapours, hence $A$ and $B$ respectively are:

$\mathrm{K}{\mathrm{O}_2}$ is used in space and submarines because it

Assertion (A) : ${FrClO}_4$ and ${Fr}_2 {PtCl}_6$ are the salts of low solubility.

Reason (R) : All alkali metal ions form insoluble salts.

STATEMENT-1: The lithium ion itself, and also its compounds, are more heavily hydrated than those of the rest of the group members.

STATEMENT-2 : The $L i^{+}$is smallest among alkali metals and polarise water molecules more easily than the other alkali metal ions.

The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluids is/are
I. They activate many enzymes.
II. They participate in the oxidation of glucose to produce ATP.
III. Along with sodium ions, they are responsible for the transmission of nerve signals.

In context with Beryllium. Which one of the following statement is incorrect.

Identify the correct statements about alkali metals.
A. The order of standard reduction potential $\left(\mathrm{M}^{+} \mid \mathrm{M}\right)$ for alkali metal ions is $\mathrm{Na}>\mathrm{Rb}>\mathrm{Li}$.
B. $\text{CsI}$ is highly soluble in water.
C. Lithium carbonate is highly stable to heat.
D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
E. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below.

Which of the following hydroxides is amphoteric in nature?

A: Molten ${BeCl}_2$ is poor conductor of electricity but ${BaCl}_2$ liquid is a good conductor.

R: Small cations are more hydrated than large cations.

Consider the following statements
(a) Density of sodium is more than potassium.
(b) Potassium carbonate is manufactured by Solvay process
(c) $LiN{O_3}$ evolves $N{O_2}$ gas on heating but $NaN{O_3}$ does not
The correct statement(s) is/are

${CaCO}_3 \rightleftharpoons {CaO}+{CO}_2$ reaction in a line goes to completion because

Which of the following are found in biological fluids $\mathrm{Na}^{+}$, $\mathrm{Mg}^{2+}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Sr}^{2+}, \mathrm{Li}^{+}$and $\mathrm{Ba}^{2+}$

An oxide of alkaline earth metals $X$ reacts with carbon and ${Cl}_2$ to give a compound ${Y}$. ${Y}$ is found in polymeric chain structure and is electron deficient molecule. The compound ${Y}$ is

Which one of the following processes is used for manufacture of calcium?

$\mathrm{K}_2 \mathrm{CO}_3$ cannot be prepared by Solvay's process because

An alkaline earth metal $M$ readily forms water soluble sulphate and water insoluble hydroxide. Its oxide $MO$ is very stable to heat and does not have rock-salt structure. $M$ is

The product obtained on fusion of$\mathrm{BaS}{\mathrm{O}_4}$ and $\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}$ is

Choose the correct statement(s)
(A) Beryllium oxide is purely acidic in nature.
(B) Beryllium carbonate is kept in the atmosphere of $CO_2.$
(C) Beryllium sulphate is readily soluble in water.
(D) Beryllium shows anomalous behaviour.
Choose the correct answer from the options given
below:

Incorrect match among the following is