Which of the following salts when dissolved in water will NOT give the corresponding pH value?
Answer
(D)
NaHCO, pH < 6
2
Which of the following is an acidic salt?
Answer
(A)
NaHSO4
3
Which of the following solutions will conduct the least amount of electricity?
Answer
(D)
0.01 M aqueous solution of sugar
4
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
Answer
(D)
2.34 x 104 coulombs
5
Which of these represents a redox reaction?
Answer
(D)
Zn + 2HCl → ZnCl2 + H2
6
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
Answer
(A)
-51.O KJ mol-
7
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?
Answer
(C)
There is no effect
8
The approximate volume of air containing 10cm3 of oxygen is?
Answer
(C)
50 cm3
9
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
Answer
(D)
steam
10
When steam is passed through red hot carbon, which of the following are produced?
Answer
(C)
Hydrogen and carbon (II) oxide
11
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?
Answer
(B)
CO and SO2
12
Oxygen-demanding waste are considered to be a water pollutant because they?
Answer
(A)
deplete oxygen which is necessary for the survival of aquatic organism
13
Which of the following will react further with oxygen to form higher oxide?
Answer
(C)
SO2 and NO
14
In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?
Answer
(A)
H and S;Cl
15
Which of the following metals does NOT form a stable trioxocarbonate (IV)?
Answer
(E)
none of the options is correct
16
Which of the following sulphides is insoluble in dilute HCl?
Answer
(C)
CuS
17
When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?
Answer
(C)
O2
18
A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?
Answer
(A)
NaHS
19
Ammonia gas is normally dried with?
Answer
(B)
quicklime
20
What are the values of x, y and z respectively in the equation: xCu + yHNO3 → xCu(NO3)2 + 4H2O + zNO?
Answer
(B)
3:8:2
21
The iron (III) oxide impurity in bauxite can be removed by?
Answer
(B)
dissolution in sodium hydroxide and filtration
22
Which of the following does NOT contain aluminium as component?
Answer
(C)
Container for caustic soda
23
A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?
Answer
(C)
zinc oxide
24
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?
Answer
(C)
K2SO4
25
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
Answer
(D)
Electroiysis of fused salt
26
Which of the following is NOT correct test for the named organic compound in each case?
Answer
(B)
Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour
27
Which of the following is used as an 'anti-knock' in automobile engines?
Answer
(B)
Lead tetra-ethyl
28
What reaction takes place when palm-oil is added to potash and foam are observed?
Answer
(B)
Saponification
29
When ethanol is heated with excess concentrated sulphuric acid, the ethanol is?
Answer
(C)
dehydrated to ethene
30
Which of the following compounds is NOT formed by the action of chlorine on methane?
Answer
(B)
C2H5CI
31
Which of the following substance is a mixture?
Answer
(B)
Sea-water
32
The general formula of an alkyl halide (where X represents the halide) is?
Answer
(B)
CnH2n + 1X
33
Which of the following are made by the process of polymerization?
Answer
(B)
Nylon and artificial rubber
34
Starch can be converted to ethyl alcohol by?
Answer
(B)
fermentation
35
The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?
Answer
(C)
evaporation
36
What mass of a divalent metal M (atomic mass = 40) would react with excess hydrochloric acid to liberate 224cm^3 dry hydrogen gas measured at S.T.P?
Answer
(D)
0.4 g
37
In the solubility curve above, water at 98\(^0\)C is saturated with KCl and KCIO\(_3\). What is the percentage of KCl impurity in the crystals formed when the solution is cooled to 30\(^0\)C?
Answer
(D)
26.5
38
In the electrolysis of aqueous solution of K2SO 4 in the above cell, which species migrate to the anode?
Answer
(A)
SO2-OH -
39
The tabulated results below were obtained by titration 10.0 cm3 of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is
Answer
(C)
4.1
40
Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?
Answer
(C)
C
41
10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction?
Answer
(B)
2HF + N2F2 \(\to\) 2NHF2
42
The number of atoms of chlorine present in 5.85g of NaCl is [Avogadro's Number = 6.02 x 10\(^{23}\)]
Answer
(A)
6.02 x 1022
43
How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24]
Answer
(B)
1.5g
44
The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation
Answer
(C)
U = \(\sqrt{\frac{k}{m}}\)
45
An element with atomic number twelve is likely to be
