class 10 ch 1 sci

1. Which of the following is a displacement reaction?

• a

• b

• c

• d

Magnesium ribbon is rubbed before burning because it has a coating of

• (a) basic magnesium carbonate

• (b) basic magnesium oxide

• (c) basic magnesium sulphide

• basic magnesium chloride

Which of the following statements about the given reaction are correct?

3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

• (i), (ii) and (iii)

• (iii) and (iv)

• (i), (ii) and (iv)

• (ii) and (iv)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Which of the following are exothermic processes?

(i) Reaction of water with quick lime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

• (i) and (ii)

• (ii) and (iii)

• (i) and (iv)

• (ii) and (iv)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

5. Oxidation is a process which involves

• (a) addition of oxygen

• (b) addition of hydrogen

• (c) removal of oxygen

• (d) removal of hydrogen

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

6. The process of reduction involves

• (a) addition of oxygen

• (b) addition of hydrogen

• (c) removal of oxygen

• (d) removal of hydrogen

Tags

NGSS.MS-PS1-5

Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?

(i) In beakers A and B, exothermic process has occurred.

(ii) In beakers A and B, endothermic process has occuBftd.

(iii) In beaker C exothermic process has occurred.

(iv) In beaker C endothermic process has occurred.

• (a) (i) only

• (b) (ii) only

• (c) (i) and (iv)

• (d) (iv), (ii) and (iii)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

8. Give the ratio in which hydrogen and oxygen are present in water by volume.

• 1:2

• 1:1

• 2:1

• 1:8

Which among the following statement(s) is (are) true?

Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

• (a) (i) only

• (b) (i) and (iii)

• (c) (ii) and (iii)

• (d) (iv) only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

• MnCl2

• HCl

• H2O

• MnO2