Which of the following statements is/are CORRECT?

1. Removal of an electron from an atom leads to cation but the gain of an electron leads to an anion.
2. Anion is smaller than parent atom but cation is larger than parent atom.

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Which of the following statements is/are correct?

1. Water is a very good solvent for ionic and partially ionic compounds.
2. Rainwater is pure water.
3. Soft water doesn't have calcium and magnesium's soluble salts.

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Which of the following statements are Correct about Syngas?

1. It is a mixture of CO and $H_2$ . 
2. It is produced from sewage.
3. Coal gasification is the process of producing syngas from coal.

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Consider the following statements about Reverse Osmosis (RO) technology:

1. It uses a semipermeable membrane to remove larger particles of drinking water.
2. It is capable of removing $100\%$ of the dissolved ions (salt) in water.
3. It is effective in treating brackish, surface, and groundwater.
4. It is used in pharmaceutical industries.

Which of the above-mentioned statements is/are correct?

Consider the following:

1. Tomato - Citric acid
2. Sour milk - Lactic acid
3. Vinegar - Methanoic acid

Which of the above-mentioned pairs is/are correctly matched?