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Which of the following materials are categories of ceramic materials? 1. Oxides – Alumina, Zirconia 2. Non-oxides – Carbides, Borides, Nitrides, and Silicides 3. Composites – Particulate reinforced combinations of oxides and non-oxides Select the correct answer using the code given below.
Excess of alumina in brick earth makes the brick
Consider the following : 1. Oxides of Hydrogen 2. Oxides of Nitrogen 3. Oxides of Sulphur Which of the above is/are the cause/causes of acid rain?
Which of the following statement (s) is/are Correct? I. Metallic oxides are said to be basic oxides. II. Non-metallic oxides are basic in nature. III. All acids have similar chemical properties.
What type of oxides is formed by metals? c) Oxides with pH 10 d) Amphoteric oxides
Which of the following statement(s) is/are correct?
1. Metallic oxides are said to be basic oxides.
2. Non-metallic oxides are basic in nature.
3. All acids have similar chemical properties.
Which of the following gases in the atmosphere is/are responsible for acid rains?
1. Oxides of sulphur
2. Oxides of nitrogen
3. Oxides of carbon
Select the correct answer:
Which of the following are not chemical changes? 1. Tempering of iron 2. Conversion of the iron piece into an electro-magnet by passing the current around the iron 3. Melting of iron 4. Rusting of iron Select the correct answer using the code given below:
Out of the total production of iron from hematite, an ore of Iron, 20% of the ore gets wasted, and out of the remaining iron, only 25% is pure iron. If the pure iron obtained in a year from a mine of hematite was 80,000 kg, then the quantity of hematite mined from that mine in the year is
Which of the following statements are true with respect to iron ore?
I. Limestone and coal are important for smelting iron ore
II. More than 20% of the world iron ore deposits are in India
III. Odisha and Jharkhand top in the production of iron ore
IV. Iran is the largest buyer of Indian iron ore