GRADE10A -HIN TEST

A glass rod dipped in ammonia when brought closer to the mouth of the test tube containing hydrochloric acid, it forms dense white fumes of ammonium chloride. It is a ____________.

• combination reaction , acidic salt is formed

• combination reaction , basic salt is formed

• combination reaction , neutral salt is formed

• neutralization reaction, acidic salt is formed.

Anita added a drop of diluted acetic acid and diluted hydrochloric acid on pH paper separately and compared the colours. Which of the following is the correct conclusion?

• pH of acetic acid is more than that of hydrochloric acid.

• pH of acetic acid is less than that of hydrochloric acid.

• Acetic acid dissociates completely in aqueous solution.

• Acetic acid is a strong acid.

The indicators which turn red in acid solution are ______________.

• turmeric and litmus

• phenolphthalein and methyl orange

• litmus and methyl orange

• phenolphthalein and litmus

A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains ______________.

• Mg(OH)2

• Na2CO3

• NaCl

• HCl

Bee stings can be treated with ______________.

• vinegar

• sodium hydrogen carbonate

• potassium hydroxide

• lemon juice

Which of the following statement 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 (iii) Lower the pH, stronger the base (iv) Lower the pH, weaker the base

• (i) and (iii)

• (ii) and (iii)

• (i) and (iv)

• (ii) and (iv)

The chemical formula of lead sulphate is______________.

• Pb₂SO4

• Pb(SO4)2

• PbSO4

• Pb2(SO4)3

Equal volumes of hydrochloric acid and sodium hydroxide solutions of the same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?

• Red

• orange

• green

• purple

9. Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the

following statement is true about the evolved gas?

(i) It turns lime water milky.                        (ii) It extinguishes a burning splinter.

(iii) It dissolves in a solution of sodium hydroxide.         (iv) It has a pungent odour.

• (i) and (ii)

• (i), (ii) and (iii)

• (ii), (iii) and (iv)

• (i) and (iv)

An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous

solution ‘B’ to ‘A’, the pink colour disappears. Which of the following statement is true

for solution ‘A’ and ‘B’?

• A is strongly basic and B is a weak base

• A is strongly acidic and B is a weak acid.

• A has pH greater than 7 and B has pH less than 7.

• A has pH less than 7 and B has pH greater than 7.