Nature of Oxides

Q.

What is the nature of non-metallic oxides?

Q. The oxidation state of oxygen in superoxide is

1. +1

2. -1

3. -2

4. 

Q.

What is the no. of unpaired electrons in ${\mathrm{Mn}}^{2+}$ ion? At no. $\mathrm{Mn}=25$.

Q. Ellingham diagram is a graphical representation of :

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Q.

Which of the following is a neutral oxide?

1. $\mathrm{SrO}$

2. ${\mathrm{Al}}_2{\mathrm{O}}_3$

3. ${\mathrm{CO}}_2$

4. $\mathrm{CO}$

Q.

Why does zinc only form a $2^{+}$ ion?

Q.

2.0 g of a metal burnt in oxygen gave 3.2 of its oxide. 1.42 g of the same metal heated in steam gave 2.27 g of its oxide. Which law is shown by this data?

Q.

What is permutit?

Q.

Classify oxides into acidic, basic, amphoteric, and neutral.

SO₂, CO, CO₂, NO₂, N₂O, Na₂O, PbO, CuO, FeO

Q.

How many replaceable hydrogen ions does phosphoric acid have?

Q.

An element forms an oxide ${\mathrm{A}}_2{\mathrm{O}}_3$ which is acidic in nature. Identify $\mathrm{A}$ as metal or non-metal.

Q. The basic character of transition metal monoxides follow the order

1. CrO >VO >FeO >TiO
2. VO >CrO >TiO >FeO
3. TiO >FeO >VO >CrO
4. TiO >VO >CrO >FeO

Q.

Tin is an element, but $\mathrm{TiN}$ is a compound. Explain.

Q.

Sodium forms which types of oxides?

Q. Amphoteric oxides are those which react with both acids and bases - True or False?

1. True
2. False

Q.

How many number of $\mathrm{S}-\mathrm{S}$ bonds are there in Sulphur trioxide trimer (${\mathrm{S}}_3{\mathrm{O}}_9$)?

Q.

Aluminum is a reactive metal but is still used for packing food articles. Why?

Q.

How many of the following can react with bases?

$\left(1\right){\mathrm{Al}}_2{\mathrm{O}}_3\left(2\right)\mathrm{MgO}\left(3\right)\mathrm{BeO}\left(4\right){\mathrm{SeO}}_2\left(5\right){\mathrm{NO}}_2\left(6\right)\mathrm{PbO}\left(7\right){\mathrm{As}}_2{\mathrm{O}}_3$

Q. Which of the following is true for mixed oxides

1. Contains cations of more than one element
2. Contains cations of one element with different oxidation state
3. It can be both (A) and (B)
4. Only (A) is correct

Q. (a) When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas (A) was evolved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).

(i) Identify (A) and (B).

(ii) Write the structures of (A) and (B).

(iii) Why does gas (A) change to solid on cooling?

(b) Arrange the following in the decreasing order of their reducing character :
HF, HCI, HBr, HI

(c) Complete the following reaction :
$Xe{F}_4+Sb{F}_5\to$

Q.

How does the nature of oxides vary on moving down a group and across a period?

Q.

What is the chemical name for ${\mathrm{Na}}_2\mathrm{O}$?

Q.

Carbon dioxide gas is __________ in nature.

1. acidic

2. basic

3. neutral

4. none of these

Q.

Amphoteric oxides are _______ oxides that show both acidic and basic properties.

Q. When KMnO4 reacts with KBr inalkaline medium gives bromate ion , then oxidation state of Mn changes from +7 to - a)+6 b) +4 c) +3 d) +2

Q.

Non-metallic oxides can be acidic or neutral in nature.

1. True
2. False

Q. Which of the following statements in not correct?

1. Li forms oxide on burning in air
2. Na forms peroxide on burning in air
3. K forms peroxide on burning in air
4. Rb forms superoxide on burning in air

Q. Oxides which combine with water to form acids are called __ oxides.

Q. Oxidation number of oxygen in superoxide ion, $O_2^{-}$ is :

1. $-2$
2. $-\frac{1}{2}$
3. none of these
4. $-\frac{3}{2}$

Q. Which IS BASIC OXIDE

1. $T{l}_2{O}_3$
2. $G{a}_{2}O$
3. $InO$
4. $B_2{O}_3$