Graphene is frequently in the news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and had high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statement(s) given above are correct?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and had high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statement(s) given above are correct?
Important Questions on Elements and Compounds
Consider the following statements regarding pH value,
1. Plants and animals are pH sensitive as they survive within the pH range of 7.0 to 7.8.
2. Human blood has pH value 7.36-7.42.
3. A change in pH of blood by 0.2 units results in death.
Which of the statement(s) given above is/are correct?
Consider the following statements,
1. The mixture of helium and oxygen is used for artificial breathing of asthma patient.
2. Solution of is used in the treatment of goitre.
Which of the statement(s) given above is/are correct?
Consider the following statements about calcium:
1. It forms basic oxide with air.
2. It floats over water.
3. It replaces sodium from sodium chloride.
The incorrect statement(s) is/are:
