Which type of chemical compound found in citrus fruits?

What happens when CO₂ gas is passed through lime water?

Bases should not be kept in active metal container. Why?

Give a chemical reaction to prove that non-metallic oxides are acidic in nature.

Name the reaction in which acid reacts with base.

How H₃O⁺ ion is formed in water solution?

What is the effect of dilution on an acid or base?

Which indicator gives pink colour in basic solution?

In which pH range our body works?

How toothpaste prevents tooth decay?

Name the chemical which is injected into the skin of a person during wasp's sting and during the nettle leaf hair sting.

How will you get relief if an insect bites?

Write the role of HCl present in the stomach.

Sea water contains many salts dissolved in it. How can the salt that we use in food is obtained?

What is ‘chlor-alkali’ process and what products are formed during this process?

Name the chemical compound which is used as a disinfectant for water.

When a sodium compound X which is also used in soda-fire extinguisher is heated, gives a sodium compound Y along with water and carbon dioxide. Y on crystallisation forms compound Z. Identify X, Y and Z.

Write the chemical formula of blue vitriol.

Which acid is present in vinegar?

Which solution is more acidic, one with a pH of 4 or one with a pH of 1?

A student dipped pH paper in rain water. What would be the colour of the pH paper?

Name the chemicals used in making fire extinguisher.

Why blue colour of copper sulphate crystals disappears on heating?

Name an acid which is present in baking powder

The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?

Write down the net ionic equation for the reaction of sodium hydroxide with hydrochloric add.

What happens when crystals of washing soda are kept open in the air for long time?

What is the use of common salt in soap industry?

Complete the following equation:

NaOH + Zn → ___ +____

What happens when nitric acid is added to an egg shell?

Which gas is evolved when hydrochloric acid is added in first test tube containing small pieces of marble and then in second test tube containing zinc granules?

Name the gas evolved when potassium nitrate crystals are heated with concentrated sulphuric acid.

What happens when an acid or a base is added to the water? Why does the beaker appear warm? Why should we always add acid or base to the water and not water to the acid or base?

Give reasons:

(i) Use of a mild base like baking soda provides relief on the area stung by honeybee.

(ii) Baking powder is added to make the cakes spongy and soft.

(iii) The colour of blue copper sulphate crystals changes to white on heating.

Among sulphurous acid and sulphuric acid, which is stronger and why?

Acetic acid is a weak acid and ammonia is a weak base. Discuss the term weak.

Give reason why solution of sulphuric acid conduct electricity whereas, alcohol does not.

Answer the following:

(i) What happens when a concentrated solution of sodium chloride is electrolysed? Write the equation of the reaction involved.

(ii) Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?

(iii) Name three products of the chlor-alkali process. State two uses of each product.

Explain why is hydrochloric acid is called, a strong acid and acetic acid, a weak acid? How can it be verified?

State in brief the method of preparation of bleaching powder. Write a balanced chemical equation for the reaction involved and state the uses of bleaching powder.

Identify the compound X on the basis of the reactions given below. Also, write the name and chemical formula of A, B and C.

Fill in the missing data in the given table.

Rohan was very angry because of the oil spot on his favourite shirt. His mother want to make him happy and doesn't know what to do. Her neighbour Mrs Sharma advised him to use bleach (bleaching powder, CaOCl₂) to remove the oil spot. Read the above passage and answer the following questions.

(i) Would you suggest the same thing to remove oil spot? Why or why not? Justify your answer.

(ii) Which substance, is available in the market to remove such spots?

(iii) What values are associated with Mrs Sharma?

Enamel has calcium phosphate [Ca ₃(PO₄)₂]. When we eat sweets, they form acid in our mouth which reacts and tooth decay starts. To avoid tooth decay, we should brush our teeth after every meal. Sonu brushes his teeth twice a day whereas Monu brushes once a day only. Answer the following questions.

(i) Is toothpaste acidic, basic or neutral? Give reason.

(ii) What values are associated by Sonu, who brushes his teeth twice a day?

Dinesh is a farmer. He got pH of his soil tested and followed advice of Agricultural Scientists of 'Kissan Centre' in growing crops. He got better quality of crops this year. Answer the following questions.

(i) Why should we get our soil tested?

(ii) If soil has pH less than 7, how can we make it neutral?

(iii) What values are possessed by Dinesh?

Aqueous solution of copper sulphate reacts with aqueous ammonium hydroxide solution to give.

Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that.

Consider the following reaction:

Here, A, B, C and D respectively are:

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. The compound X and Y could be

The organic acid present in tomato is

You are having five solutions A, B, C, D and E with pH values as follows:

A = 1.8, B = 7, C = 8.5, D = 8 and E = 5

Which solution would be most likely to liberate hydrogen with magnesium powder?

The reagent used to distinguish iron (II) chloride and iron (III) chloride is

An acid (A) with sodium hydrogencarbonate is used in making the cakes fluffy and spongy. It is due to the release of (B) gas in the reaction. Here, A and B are

The pH of a solution is 4.0. What should be the change in the hydrogen ion concentration of the solution, if its pH is to be increased to 5.0.

The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the solution will be: