S Block Elements

Two elements A and B have similar chemical properties. They don’t form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :

The ionic mobility of alkali metal ions in aqueous solution is maximum for :

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point :

For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si}, \mathrm{Al}$ and $\mathrm{Fe}$ should be as close as to :

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 :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The alkali metals and their salts impart characteristic colour to reducing flame. Reason R : Alkali metals can be detected using flame tests. In the light of the above statements, choose the most appropriate answer from the options given below :

The metallic sodium disolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of :

KO₂ (potassium super oxide) is used in oxygen cylinders in space and submarines because it :

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

A metal on combustion in excess air forms X. X upon hydrolysis with water yields H₂O₂ and O₂ along with another product. The metal is :

One of the by-products formed during the recovery of NH₃ from Solvay process is :

A s-block element (M) reacts with oxygen to form an oxide of the formula MO₂. The oxide is pale yellow in colour and paramagnetic. The element (M) is :

Match List I with List II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List-I Elements List-II Properties (a) Li (i) Poor water solubility of ${I^ - }$ salt (b) Na (ii) Most abundant element in cell fluid (c) K (iii) Bicarbonate salt used in fire extinguisher (d) Cs (iv) Carbonate salt decomposes easily on heating Choose the correct answer from the options given below :

Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List - I List - II (a) Li (i) photoelectric cell (b) Na (ii) absorbent of $C{O_2}$ (c) K (iii) coolant in fast breeder nuclear reactor (d) Cs (iv) treatment of cancer (v) bearings for motor engines Choose the correct answer from the options given below :

Choose the correct statement from the following :

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in :

Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

Correct statement about alkali metal oxides is :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: $\mathrm{LiF}$ is sparingly soluble in water. Reason R: The ionic radius of $\mathrm{Li}^{+}$ ion is smallest among its group members, hence has least hydration enthalpy. In the light of the above statements, choose the most appropriate answer from the options given below.