Preparations and Reactions of Sodium Oxide

Q.

How would you balance the following equation: $\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to \mathrm{MgO}\left(\mathrm{s}\right)$

Q.

Write the chemical equation for sodium oxide reacting with water.

Q.

Why beryllium is not considered as alkaline earth metals

Q.

The chemical formula of lead sulphate is

1. ${\mathrm{Pb}}_2{\mathrm{SO}}_4$

2. $\mathrm{Pb}{\left({\mathrm{SO}}_4\right)}_2$

3. ${\mathrm{PbSO}}_4$

4. ${\mathrm{Pb}}_2{\left({\mathrm{SO}}_4\right)}_3$

Q. Given below are the two statements : one is labelled as Assertion (a) and the other is labelled as Reason (R).

Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of $A{l}_2{O}_3$ with cryolite.

Reason(R) : The oxidation state of $Al$ in cryolite is $+3$.

In the light of the above statements , choose the most appropriate answer from the options given below :

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Q. Write an example of a metal oxide like copper in its conductivity & appearance

Q.

SO₂ is a:

1. Acidic oxide

2. Basic oxide

3. Amphoteric oxide

4. Neutral oxide

Q.

Write the balanced equation for reduction of lead(II) oxide by carbon?

Q.

Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: $\mathrm{K},\mathrm{C},\mathrm{AI},\mathrm{Si},\mathrm{Ba}.$

Q. Which of the following statement is incorrect for Solvay process:

1. $N{H}_3$ is reused
2. $CaC{l}_2$ is one of final product
3. $N{a}_{2}C{O}_3$ is partially changed into $NaHC{O}_3$
4. Potassium carbonate cannot be prepared by this method

Q.

Sodium hydroxide on reaction with amphoteric oxides like.

$SnO+2NaOH\to$ ____$+H_{2}O$ to form.

1. 

2. 

3. NaSnO₂

4. None of these

Q.

Which of the following elements will form acidic oxide?

1. An element with atomic number $7$

2. An element with atomic number $3$

3. An element with atomic number $12$

4. An element with atomic number $19$

Q. Actinoids are mostly attacked by which acid?

1. Hydrochloric acid
2. Nitric acid
3. Sulphuric acid
4. Boric acid

Q. Sodium nitrate decomposes above $-{800}^{o}C$ to give
(IIT-JEE, 1998)

1. $N_2$
2. $O_2$
3. $N{O}_2$
4. $N{a}_{2}O$

Q. The compound(s) formed on combustion of sodium metal in excess air is/are:

1. $N{a}_2{O}_2$
2. $N{a}_{2}O$
3. $Na{O}_2$
4. $NaOH$

Q. What is the best description of the change that occurs when $N{a}_{2}O\left(s\right)$ is dissolved in water?

1. Oxide ion accepts sharing in a pair of
   electrons
2. Oxidation number of oxygen increases
3. Oxidation number of sodium decreases
4. Oxide ion donates a pair of electrons

Q. A hydrate of iron $\left(III\right)$ thiocyanate $Fe(SCN{)}_3$, was found to contain $19\%H_{2}O$. What is the formula of the hydrate.
(Given: Molecular weight of $Fe=56\text{u},S=32\text{u}$)

1. $Fe(SCN{)}_3.3H_{2}O$
2. $Fe(SCN{)}_3.6H_{2}O$
3. $Fe(SCN{)}_2.2H_{2}O$
4. $Fe(SCN{)}_3.H_{2}O$

Q. If 0.1 g atom of magnesium is allowed to react with 2g molecule of oxygen then which of the following is correct for given equation? 2Mg (s) + O2 (g) = 2MgO (s) 1 )oxygen is the limiting reagent 2) magnesium is the limiting reagent 3 )0.02 moles of magnesium oxide is formed 4 )0.5 moles of oxygen remains in excess

Q. What are the raw materials used in solvay's process for the preparation of sodium carbonate?

Q.

. How will you prove that

the oxide formed by sulfur is acidic in nature

Q.

What is the chemical formula of potassium permanganate?

Q.

Name one burning metal that combines directly with nitrogen.

Q. One of the by-products formed during the recovery of $N{H}_3$ from solvay process is

1. $CaC{l}_2$

2. $Ca{\left(OH\right)}_2$

3. $NaHC{O}_3$

4. $N{H}_{4}Cl$

Q.

By giving balanced chemical equations state what happens, when heated iron reacts with steam.

Q. The stability order of oxide, peroxide and superoxide of alkali metal is:

1. superoxide > peroxide > normal oxide
2. normal oxide > superoxide > peroxide
3. normal oxide > peroxide > superoxide
4. peroxide > normal oxide > superoxide

Q. Alkali metals and alkaline earth metals have the characteristics of :

1. high melting points
2. very high oxidation potentials
3. solubility in liquid ammonia
4. all of the above

Q. Which of the following statement(s) is/are true regarding a highly pure dilute solution of sodium in liquid ammonia?

1. It shows blue colour
2. It exhibits electrical conductivity
3. Reaction to produce sodium amide can happen photochemically
4. It produces hydrogen gas on leaving it undisturbed for some time

Q. 4 moles of ammonia on reaction with 3 moles of calcium hypochlorite gives a salt $\left(B\right)$, a gas (C) and water. Gas $\left(C\right)$ on reaction with calcium gives compound $\left(D\right)$ which on hydrolysis gives ammonia again . Identify $\left(B\right)$, $\left(C\right)$ and $\left(D\right)$.

1. $CaC{l}_2,N_2,C{a}_3{N}_2$
2. $Ca(OH{)}_2,N{H}_3,CaNH$
3. $CaC{l}_2,N_2{O}_5,Ca(N{O}_3{)}_2$
4. $Ca(OH{)}_2,N{O}_2,Ca{N}_2$

Q. For the following reactions, the metal complexes X and Y are
(i) $Ni\left(s\right)\underset{1atm,25C}{\overset{CO\left(g\right)}{\to }}X$
(ii) $FeC{1}_2\stackrel{2Na{C}_5{H}_5}{\to }Y$
X and Y are respectively

1. $\left[Ni\right(CO{)}_4],[Fe\left(n^5{C}_5{H}_5{)}_2\right]$
2. $\left[Ni\right(CO{)}_5],[Fe\left(n^5{C}_3{H}_5\right)]$
3. $\left[Ni\right(CO{)}_6],[Fe\left(n^1{C}_5{H}_5\right)]$
4. $\left[Ni\right(CO{)}_4],[Fe\left(n^1{C}_5{H}_5{)}_2\right]$

Q. Assertion :The stability of peroxides and superoxides increases in passing from Li to Cs. Reason: The electropositive character of the elements in the periodic table increases on moving down a group.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.