Question

1.Which of the following is an Olfactory indicator?
a) Turmeric b) Onion juice c) Litmus d) Methyl orange
2. Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(in) Lower the pH, stronger the the base
(iv) Lower the pH, weaker the base
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
3. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.
a. X- Sulphuric acid and Y- Oxygen gas
b. X- Hydrochloric acid and Y- Oxygen gas
c. X- Sulphuric acid and Y- Hydrogen gas
d. X- Hydrochloric acid and Y- Hydrogen gas
4.Arrange in the increasing order of their pH values: NaOH solution, Blood, Lemon juice
5.Give the chemical name of the hardest substance present in the human body.
6. Name the compound used for plastering fractured bones.
7. The oxide of a metal M was water soluble when a blue litmus strip was dipped in this solution, it did not go any change in colour. Predict the nature of oxide
8. Use of mild base like …………. on the bee-stung area gives relief.
SECTION B ( 3 marks)
9.A compound `X` on electrolysis in aqueous solution produces a strong base. `Y` along with two gases `A` and `B`. `B` is used in manufacture of bleaching powder. Identify X, Y, A and B. Write chemical equations.
10. A substance `X` used in the kitchen for making tasty crispy pakoras.and is also an
ingredient of antacid. Name the substance `X`.
(i) How does `X` help to make cakes and bread soft and spongy.
(ii) Is the pH value of solution of `X` is lesser than or greater than 7.0?
11.Give reasons:
a) Rain water conducts electricity but distilled water does not.
b)we feel burning sensation in the stomach when we over eat.
c) Tarnished copper vessels regains it’s shine when rubbed with tamarind juice.
12.Complete the following equations :
a) Na2CO3 + HCl -
b) NaOH + Zn 
c) CO2+ Ca (OH)2 
SECTION C ( 5 marks)
13. a) What happens when Chlorine is passed into slaked lime. Write equation.
b) Write the reaction of Ammonia with brine solution.
c) How are salts formed? Give equation to show the formation of acidic salt, basic salt and neutral salt.

Answer 1

Answer:

1.onian juice

2a

3b

4lemonjuice NaOH Blood

5calcium phosphate

6dont know

7oxide is basic so no colour change

8shampoo

9sorry

102

11b

12sorry

13 tu bhi kuch find kr

Explanation:

follow and make me brainlist