Dakshana Mock Test Season I

Dakshana Mock Test Season I

1] Which of the statements about the reaction below are incorrect ?
Fe2O3(s) + 2Al → 2Fe(l) + Al2O3(s).

(a) Ferric oxide is getting reduced.
(b) Aluminium is getting oxidised.
(c) Ferric oxide is getting oxidised.
(d) Aluminium is getting reduced.

i. (a) and(b)
ii. (b) and (c)
iii. (c) and (d)
iv. (d) and (a)

2] Which chemical reaction is opposite of Decomposition Reaction?

i. Oxidation reaction
ii. Reduction reaction
iii. Combination reaction
iv. Displacement reaction

3] Which one of the following processes involve physical changes?

i. Formation of curd from milk.
ii. Melting of ice to water.
iii. Burning of petrol.
iv. Rusting of iron.

4] Which of the following reaction is not a redox reaction?

i. Pb + CuCl2 → PbCl2 + Cu
ii. Na2SO4 + BaCl2 → BaSO4 + 2NaCl
iii. C + O2 → CO2
iv. CH4 + 2O2 → CO2 + 2H2O

5] MnO4-1 acts as oxidizing agent in redox. It gets reduced to different species depending upon the medium of the reaction.

a. In acidic medium, it gets converted to Mn2+
b. In neutral medium, it gets converted to MnO2
c. In basic medium, it gets converted to MnO42-

Please choose the correct statement.

i. MnO4- acts as a very weak oxidizing agent in acidic medium.
ii. It reduces FeO to Fe2O3 in acidic medium.
iii. MnO4- acts as a strong oxidizing agent in acidic medium.
iv. It reduces FeO to Fe2O3 in basic medium.

6] Sodium Chloride on reacting with silver nitrate forms silver chloride and sodium nitrate.
Which of the following correctly represents the type of the reaction involved?

a. Displacement reaction
b. Precipitation reaction
c. Combination reaction
d. Double Displacement reaction

i. (a) only.
ii. (b) only.
iii. (d) only.
iv. (b) and (d) only.

7] In the following reaction, find the value of x.

4NH3 + 5O2 → 4NO + xH2O

i. 12
ii. 10
iii. 6
iv. 5

8] Sodium metal is kept in kerosene because

i. Density of kerosene is less than sodium.
ii. Sodium is highly reactive in open air.
iii. Sodium forms stable compound with kerosene.
iv. Sodium forms a protective layer when kept in water.

9] What is the chemical formula for bleaching powder?

i. CaClO2
ii. Ca3O2Cl2
iii. CaOCl2
iv. Ca(OCl)2

10] Once Shyam was playing cricket, while facing bouncer delivery Shyam broke his hand. Immediately he, sent to hospital where doctor put a coating of white colored substance over hand. The white colored compound easily accepts some mole of water molecule to form compound A. Please give the molecular formula of compound A.

i. CaSO4.2H2O
ii. CaSO4.1/2H2O
iii. CaSO4.4H2O/
iv. CaSO4.3/2H2O/

11] Ammonium acetate is a neutral salt because it is a

i. Salt of strong acid and strong base.
ii. Salt of weak acid and strong base.
iii. Salt of strong acid and weak base.
iv. Salt of weak acid and weak base.

12] Which of the following gives the correct increasing order of pH value?

i. Water < Acetic acid < Hydrochloric acid
ii. Water < Hydrochloric acid < Acetic acid
iii. Acetic acid < Water < Hydrochloric acid
iv. Hydrochloric acid < Acetic acid < Water

13] When electricity is passed through an aqueous solution of Potassium Chloride, it decomposes to form a gas A at anode. The element of gas A belongs to

i. Group 1
ii. Group 2
iii. Group16
iv. Group 17

14] A salt is prepared with acid with very less value of pH and base with also very less pH value. What can be the possible pH value of salt?

i. 3.6
ii. 7
iii. 8.2
iv. 11.7

15] Choose the correct option.

i. Formic acid is more acidic than hydrochloric acid.
ii. Water is more acidic than sodium hydroxide
iii. Water is less basic than acetic acid.
iv. Ammonium hydroxide is more basic than sodium hydroxide.

16] When salt sodium bicarbonate is heated, it forms a carbonate and evolves a gas. The gas is

i. H2
ii. O2
iii. CO
iv. CO2

17] A solution with pH 9 changes

i. Red litmus paper to blue.
ii. Blue litmus paper to red.
iii. No changes will be observed.
iv. Turns litmus paper white.

18] An element X produces an oxide on heating in open air. The oxide in aqueous medium forms a solution which reacts with zinc hydroxide forming a zincate. Choose the possible atomic number of the element X.

i. 35
ii. 16
iii. 54
iv. 11

19] An ionic compound

i. Doesn't conduct electricity in its solid form.
ii. Are not soluble in water.
iii. Doesn't conduct electricity in its aqueous form.
iv. Possesses interionic repulsion making their melting point considerably low.

20] Choose the correct statement.

i. Na cannot displace Pb from its salt solution.
ii. An element with atomic number 57 is a widely used non-metal.
iii. Elements with atomic number 36 and 37 fall in same period.
iv. Potassium is more reactive than silver.

21] The salt, sodium phosphate contains three sodium ion and a phosphate ion. Each sodium ion exhibits 1 positive charge. Using this information, calculate the total charge on the given salt.

i. 3
ii. -3
iii. 6
iv. None of the above

22] Noble metals like gold can easily be soluble in

i. HCl
ii. HCl + H2SO4 (1:1)
iii. HCl + H3PO4 (2:1)
iv. HCl + HNO3 (3:1)

23] Which of the following are not ionic compounds?

i. KCl
ii.CsCl
iii. CCl4
iv. NaCl

24] Brass is made up of

i. Iron and zinc
ii. Iron and copper
iii. Copper and zinc
iv. Copper and chromium

25] The electronic configurations of three elements A, B and C are

A: 2
B: 2,6
C: 2,8,1

Which of the following is correct?

i. A is a metal.
ii. B is a metal.
iii. C is a non-metal.
iv. A is a noble gas.






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