Dakshana Mock Test Season I Solutions
Dakshana Mock Test Season I Solutions
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.
Answer: (c) and (d)
2] Which chemical reaction is opposite of Decomposition Reaction?
Answer: Combination reaction
3] Which one of the following processes involve physical changes?
Answer: Melting of ice to water.
4] Which of the following reaction is not a redox reaction?
Answer: Na2SO4 + BaCl2 → BaSO4 + 2NaCl.
5] MnO4 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.
Answer: MnO4- acts as a strong oxidizing agent in acidic 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
Answer: (b) and (d) only.
7] In the following reaction, find the value of x.
4NH3 + 5O2 → 4NO + xH2O
Answer: 6.
8] Sodium metal is kept in kerosene beacuse
Answer: Sodium is highly reactive in open air.
9] What is the chemical formula for bleaching powder?
Answer: CaOCl2.
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.
Answer: CaSO4.2H2O.
11] Ammonium acetate is a neutral salt because it is a
Answer: Salt of weak acid and weak base.
12] Which of the following gives the correct increasing order of pH value?
Answer: 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
Answer: 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?
Answer: 3.6
15] Choose the correct option.
Answer: Water is more acidic than sodium hydroxide.
16] When salt sodium bicarbonate is heated, it forms a carbonate and evolves a gas. The gas is
Answer: CO2.
17] A solution with pH 9 changes
Answer: Red litmus paper to blue.
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.
Answer: 11
19] An ionic compound
Answer: Doesn't conduct electricity in its solid form.
20] Choose the correct statement.
Answer: 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.
Answer: None of the above.
22] Noble metals like gold can easily be soluble in
Answer: HCl + HNO3 (3:1)
23] Which of the following are not ionic compounds?
Answer: CCl4
24] Brass is made up of
Answer: Copper and zinc.
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?
Answer: A is a noble gas.
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