GRADE: 10 CHEMISTRY MCQ (TERM-1)

GRADE: 10

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CHEMISTRY MCQ (TERM-1)

When ferrous sulphate crystals are heated, the colour of the residue formed is :

(a) red

(b) brown

(c) orange

(d) green.

A small amount of quick lime is taken in a beaker. Water is added slowly to the

beaker. Which of the following observations were noted?

(a) Hissing sound and the solution becomes hot.

(b) No characteristic sound and solution turns cold

(c) Hissing sound and the solution becomes cold.

(d) No characteristic sound and the solution become hot.

The colour of pH strip turned red when it was dipped in a sample. The sample could

be :

(a) dilute NaOH solution

(b) tap water

(c) dilute HCl solution

(d) dilute NaHCO3 solution.

The correct method of finding pH of solution is to :

(a) heat the solution in the test tube and expose the pH paper to the vapours formed.

(b) pour solution from the test tube on pH paper

(c) drop the pH paper into the solution.

(d) add a drop of solution on the pH paper using a dropper.

10 mL of HCl and 10 mL of NaOH solutions are taken in two separate beakers labelled

I and II respectively. On adding Zinc granules to both, it is observed that at room

temperature

(a) Gas is evolved vigorously in both.

(b) Gas is evolved vigorously in beaker I and not in the beaker II .

(c) Gas is evolved vigorously in beaker II but not in the beaker I.

(d) No gas is evolved in either of the two beakers.

A new iron nail is placed in a beaker containing aqueous copper sulphate solution.

When the nail is taken out after 15 minutes, its surface is coated with:

(a) reddish deposit (b) greenish deposit

(c) black deposit

(d) white

deposit.

A piece of granulated Zn was dropped into copper sulphate solution. After some time

the colour of solution changed from:

(a) light green to blue

(b) blue to colourless

(c) light green to colourless

(d) blue to green.

When iron nails are kept in copper sulphate solution for 30 minutes, the colour of

solution changes into:

(a) red

(b) pink

(c) orange

(d) light

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green

The colour of the precipitate formed when barium chloride solution reacts with

sodium sulphate solution is:

(a) yellow

(b) orange

(c) green

(d) white

A student adds a few drops of universal indicator to a solution and observes colour

changes to orange. The solution would be:

(a) strong acid

(b) strong base

(c) weak acid

(d) weak

base

Observe the following figures and choose the correct option.

(a) pH of I is greater than of II and III

(b) pH of IV is less than of I and II

(c) pH of IV is greater than of I, II and III

(d) pH of I is less than of III of and IV

When hydrochloric acid reacts with zinc:

(a) surface of zinc becomes white.

(b) surface of zinc becomes black and dull.

(c) zinc becomes powder.

(d) the reaction mixture turns red.

Freshly prepared iron sulphate solution was taken in each of four test tubes. Strips of

Cu, Fe, Zn and Al were introduced in different test tubes, a black residue was

observed in two test tubes. The pair of metals forming the residue is:

(a) Cu and Zn

(b) Al and Cu

(c) Fe and Al

(d) Zn and

Al

A student added a piece of zinc metal to four test tubes I, II, III, IV which respectively

contain aqueous solution of aluminium sulphate, zinc sulphate, ferrous sulphate and

copper sulphate. In which solution he observed that the reaction has taken place.

(a) I, II

(b) II, III

(c) III, IV

(d) I, IV

Aluminum strip was placed in a solution of copper sulphate. After one hour, it was

observed that the colour of solution changes. The colour of solution would become.

(a) light green (b) colourless (c) dark brown (d) deep blue

10 mL of freshly prepared iron sulphate solution was taken in each of four test tubes

I, II, III and IV. Strips of copper, iron, zinc and aluminium were respectively introduced

in the test tubes I, II, III, and IV. A black residue was obtained in two of them. These

test tubes are :

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(a) I, III (b) I, IV (c) II, IV (d) III, IV

A student dipped strip of pH paper in solutions taken in beakers ¡®A¡¯ and ¡®B¡¯. The

colour of strip changed to red in breaker ¡®A¡¯ and green in breaker ¡®B¡¯. The samples in

¡®A¡¯ and ¡®B¡¯ respectively are:

(a) HCl, water

(b) HCl, lemon juice (c) lemon juice, HCl (d) water, HCl

Bottle X contains NaOH solution and bottle Y contains distilled water. On dipping pH

paper strips in each of the solutions, the colour seen in ¡®X¡¯ and ¡®Y¡¯ respectively are:

(a) blue, red (b) blue, green

(c) green, blue (d) red, blue

Which one of the following substances will be required to identify the gas evolved,

when dil. HCl reacts with solid sodium carbonate?

(a) red litmus solution (b) lime water (c) blue litmus solution (d) zinc granules

10 mL of freshly prepared iron sulphate solution was taken in each of four test tubes

I, II, III and IV. Strips of copper, iron, zinc and aluminium were respectively introduced

in the test tubes I, II, III, and IV. A black residue was obtained in two of them. These

test tubes are :

(a) I, III

(b) I, IV

(c) II, IV

(d) III, IV

In an experiment each of the metals Al, Zn, Cu and Fe are reacted with ZnSO4, CuSO4,

Al2 (SO4)3 and FeSO4, solutions. The results are tabulated as follows where ¡® ¡Ì ¡¯ means

that the reaction occurs and ¡®§·¡¯ means no reaction occurs.

On the basis of the above result the order of the reactivity of the metals may be

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concluded as:

(a) Zn > Fe > Al > Cu

(b) Al > Fe > Zn > Cu

(c) Zn > Al > Fe > Cu

(d) Al > Zn > Fe > Cu

Some iron nails were dropped in an unknown solution taken in a beaker and left for

10 minutes. It was then observed that a brown coating is formed on nails. The

solution is of:

(a) Al2 (SO4)3

(b) Cu SO4

(c) Fe SO4

(d) ZnSO4

Bottle A contains acetic acid and bottle B contains sodium carbonate solution. When

pH paper is dipped in each of the solution, the colour seen in A and B respectively will

be:

(a) blue, orange (b) orange, green

(c) orange, blue

(d) green,

blue

On adding a few drops of universal indicator to three unknown colourless solutions

(X), (Y) and (Z) taken separately in three test tubes shown in the following diagrams, a

student observed the changes in colour as green in (X), red in (Y) and violet in (Z).

Arrangement of solution in the decreasing order of pH is:

(a) X, Y, Z

(b) Z, X, Y

(c) Y, X, Z

(d) Z, Y, X

10 mL of HCl and 10 mL of NaOH solutions are contained in two separate beakers

labeled I and II respectively. On adding zinc granules to both, it is observed that at

room temperature:

(a) gas is evolved in beaker II but not in beaker I

b) no gas is evolved in either of the two beakers

c) gas is evolved vigorously in both.

(d) gas is evolved vigorously in beaker I but not so in beaker II.

Solutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate

were separately taken in four test tubes and some iron nails were placed in each of

the solutions. After few minutes, it would be observed that the colour of:

(a) Solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and

that of ferrous sulphate did not change.

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(b) Solutions of zinc sulphate and aluminium sulphate only changed.

(c) Copper sulphate solution only changed.

(d) All the four solutions changed

Four test tubes containing solutions are shown along with colours. FeSO4 is

contained in :

(a) (II) (b) III (c) I (d) IV

During the experiment of heating of Ferrous sulphate crystals, four students recorded

their observations as : (i) green colour, of crystals changes to brown black colour (ii)

brownish yellow gas is evolved (iii) blue colour of crystals changes to green colour (iv)

smell of burning sulphur is felt Which of the above observations are correct ?

(a) (i), (ii)

(b) (i), (iv)

(c) (ii), (iii)

(d) (iii), (iv)

An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10

minutes. The nail will be found to be covered with:

(a) brown deposit (b) black deposit

(c) white deposit

(d) gray

deposit

A dilute solution of sodium bicarbonate is taken in a test tube and a few drops of the

universal indicator is added to it.

The colour observed will be:

(a) blue

(b) yellow

(c) orange

(d) green

A student dips pH papers in solution X and Y and observes that the pH paper turns

blue and orange respectively in them. He infers that:

(a) X is HCl solution, Y is NaOH solution.

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