Mercury is used in-

1. Mascara
2. Dental restoration
3. Ornaments

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Which of the following statements are correct?

1. Cathode rays will travel in a straight line if there is no electrical and magnetic field.
2. Cathode rays do not depend upon the material of electrodes.
3. Cathode rays depend upon the nature of the gas present in the cathode ray tube.

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Consider the following statements regarding Aqua Regia solution:

1. It is a mixture of concentrated hydrochloric acid and nitric acid.
2. It is corrosive, which is used to dissolve gold and platinum.

Which of the statements given above is/are NOT correct?

Washing soda can be used-

1. In Glass and paper industries.
2. In the manufacture of sodium compounds such as borax.
3. As a cleaning agent for domestic purposes.
4. Increasing permanent hardness of the water.

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Which of the following statements is/are CORRECT?

$1$. Rutherford bombarded very thin gold foil with alpha particles, but most of the alpha particles passed through the gold foil undeflected.
$2$. Gamma rays are neutral and don't have any particles.
$3$. Beta rays are similar to electron particles.

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Which of the following is a form of calcium carbonate?

1. Limestone
2. Chalk
3. Marble

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Which of the following statements are correct?

1. Isotopes have the same number of protons but different numbers of neutrons.
2. Isobars have the same numbers of nucleons but different numbers of protons.

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Consider the following statements about Rocksalt:

1. They are often brown in color due to the presence of sodium chloride.
2. Beds of rock salt were formed when seas of bygone ages dried up.
3. Rock salt is mined like coal.

Which of the statements given above is/are true?