Question

Answer the following in short :-

1. What are neutral substances?

2. What is formed when an acid and a base react with each other?

3. What are anhydrous salt?

4. What type of reaction takes place when an acid reacts with a base?

5. Name the substance that gives yellow colour to turmeric.​

Answer 1

Answer:

1. Substances which are neither acidic nor basic, are called neutral substances.

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2. The reaction of an acid with a base is called a neutralization reaction.The products of this reaction are a salt and water.

3. anhydrous means without water. anhydrous salt is only the cation and anion making up the salt.

4. neutralization reaction

5. curcumin

The golden yellow color of turmeric is due to curcumin. It also contains an orange-colored volatile oil.

Answer 2

Answer:

Match the columns:

Exothermic reaction - Energy evolved

Endothermic reaction - Energy absorbed

Oxidation - Gain of oxygen

Reduction - Loss of oxygen

Mixture - Sea water

Compound - CO2

H2SO4 - Chemical formulae

Salt - Sea water

Burning of fuels - Petroleum

Iron - Rust

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Multiple choice questions::

1) A Chemical change:

form new substances (C)

2) Melting of wax is:

Reversible physical change (A)

3) Common salt produced by from sea water by:

Both A and B, Evaporation and then crystallization. (C)

4) Zn + H₂SO₄ → ZnSO₄ + H₂

This is a displacement type of reaction (B)

5) Which one is Metal?

Zinc (D)

6) Ozone (0₃) molecule is:

Triatomic (A)

7) Reddish brown compound form on iron on exposure to moist air is:

Rust (C)

8) Liquid metal is:

Mercury (C)

9) Only non-metal that is a good conductor of electricity is:

Graphite (B)

10) Calcium carbonate has formula:

CaCO3 (C)

11) A molecule of a compound has the formula X₂0₃. How many atoms are there in its molecule?

2 + 3 = 5 (B)

This is answer for your top first question