Class X (Chemistry Exp-1 and 2)

A student added dilute HCL to solid sodium carbonate and note down observation -

• (i) No change takes place

• (ii) A loud sound is produced

• (iii) A brisk effervescence occurs

• (iv) Solution turns blue

A gas produced on reaction of sodium carbonate with dilute HCL will

• (i) Burn with pop sound

• (ii) Be colourless and odourless

• (iii) Turn lime water milky

• (iv) Extinguish burning splinter if brought near it

A gas produced on reaction of zinc metal with dilute HCL

The incorrect statement about the gas is:

• (i) Burns with a pop sound

• (ii) Is colourless and odourless

• (iii) Turns lime water milky

• (iv) Is combustible

The colour of the aqueous solution of ferrous sulphate is

• (a) Blue

• (b) Green

• (c) Yellow

• (d) Colourless

The colour of the aqueous solution of copper sulphate is

• (a) Blue

• (b) Green

• (c) White

• (d) Colourless

What colour change do you observe when a zinc strip is dipped in ferrous sulphate solution

• (a) Blue to green

• (b) Blue to colourless

• (c) Green to colourless

• (d) Green to blue

What colour change do you observe when an iron nail is dipped in zinc sulphate solution

• (a) Blue to green

• (b) Blue to colourless

• (c) Green to colourless

• (d)No change in colour

In which of the following reactions, colour change of the solution is observed

• I

• II

• III

• IV

Aqueous solution CuSo4, FeSo4, ZnSo4 and Al2(So4)3, takes four test tubes, A, B, C and respectively.

An aluminium strips is dipped in each test tube in which test tube colour change occurs.

• (a) A and C

• (b) B and C

• (c) C and D

• (d) A and B

A strip of copper was placed in a beaker containing Zinc Sulphate solution. On observing the strip the next day, it was noticed that-

• the copper strip remained as it was

• the copper strip become thinner

• the copper strip became thicker

• the colour of the strip changed