Which of the following scientists discovered the neutron?
Odpoveď
(C)
James Chadwick
2
How many protons does 4020Ca contain?
Odpoveď
(A)
20
3
If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X
Odpoveď
(A)
9.6
4
Consider the reaction represented by the equation: 23892U + 10 → 13956Ba + 9436Kr + 310n. The reaction represents a
Odpoveď
(A)
nuclear fission
5
How many orbitals are associated with the p-sub energy level?
Odpoveď
(B)
3
6
Which of the following elements has the electronic configuration:1s22s22p63s23p1? [11Na, 13A1, 14N,16S]
Odpoveď
(A)
Al
7
The following properties are characteristics of transition elements except
Odpoveď
(B)
fixed oxidation states
8
Which of the following ions is isoelectronic with neon? [\(_3\)Li, \(_9\)F, \(_{10}\)Ne, \(_{17}\)CI,\(_{19}\)K ]
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(B)
F-
9
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
Odpoveď
(C)
1s2 2s2 2p6 3s2 3p4
10
An element Q forms a compound QCI5. In which group of the periodic table is Q?
Odpoveď
(C)
V
11
Which of the statements about the behaviour of the atom is correct?
Odpoveď
(D)
cations are smaller than the parent atom
12
Which of the following properties of covalent compounds is not correct? They
Odpoveď
(D)
have high boiling points
13
Which of the following arrangements is in order of increasing ionization energy?
Odpoveď
(A)
AI, Si, P, S
14
In bonded atoms, increase in electronegativity difference,
Odpoveď
(A)
increases polarity
15
Which of the following molecules is not linear in shape?
Odpoveď
(C)
NH3
16
The number of particles in one mole of a chemical compound is the
Odpoveď
(B)
avogadro's number
17
How many molecules are there in 14 g of nitrogen at s.t.p.? [N = 14, Avogadro's constant = 6.02 x 10\(^{23}\) mol-1]
Odpoveď
(B)
3.01 x 1023
18
Consider the reaction represented by the equation: 2NaHCO3 → Na2CO 3 + H 2O + CO 2. What is the mass of sodium trioxocarbonate (lV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO3 = 84, Na2CO3 = 106]
Odpoveď
(C)
21.2 g
19
What is the percentage by weight of calcium in Ca(OCI)2? [Ca = 40, Cl = 35.5, O = 16]
Odpoveď
(A)
28.0%
20
What is the value of -14oC on the Kelvin temperature scale?
Odpoveď
(A)
259K
21
Which of the following expressions correctly represents Charles' law?
Odpoveď
(D)
V = KT
22
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
Odpoveď
(B)
partial pressure
23
In a chemical reaction, ∆H is positive when
Odpoveď
(A)
H (product) >H (reactant)
24
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O(g) → H 2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
Odpoveď
(A)
formation
25
Salts that contain water of crystallization are said to be
Odpoveď
(D)
hydrated
26
Which of the following dilute acids does not react with metals to liberate hydrogen?
Odpoveď
(D)
HNO3(aq)
27
Which of the following compounds is not a double salt?
Odpoveď
(A)
Zn(OH)NO3
28
Which of the following hydroxides will readily dissolved in water?
Odpoveď
(B)
NaOH
29
Which of the following acids from normal salt only?
Odpoveď
(C)
Trioxonitrate (V) acid
30
A solution that contains as much solute as it can dissolve at a given temperature is said to be
Odpoveď
(B)
saturated
31
Which of the following salts is insoluble in water?
Odpoveď
(D)
AgCI.
32
Which of the following statement is correct? The solubility of
Odpoveď
(B)
gases decreases with increase in temperature
33
A catalyst increases the rate of chemical reaction by
Odpoveď
(B)
decreasing the activation energy of the reaction
34
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI(aq) + CaCO 3(s) → CaCI2(aq) + H2O (I) + CO2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
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(B)
ll, lll and IV only
35
Which of the following substances is the anode in the dry Leclanche cell ?
Odpoveď
(D)
Zinc container
36
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
Odpoveď
(B)
an oxidizing agent
37
Which of the following oxides of nitrogen has oxidation number of + 1?
Odpoveď
(B)
N2O
38
The separation of petroleum fractions depends on the differences in their
Odpoveď
(A)
boiling points
39
Which of the following raw materials is used in the plastic industry ?
Odpoveď
(B)
Ethene
40
The product of the reaction between C 2H5OH and concentrated H2SO 4 at 170oC is
Odpoveď
(D)
CH2 = CH 2
41
When protein is heated to a high temperature it undergoes
Odpoveď
(B)
denaturation
42
What is the molecular formula of a compound with empirical CH2O and vapour density of 90? [H = 1, C = 12, O = 16]
Odpoveď
(D)
C6H12O6
43
What is the product of the reaction between propene and 1 mole of hydrogen iodide?
Odpoveď
(A)
CH3CHICH3
44
Ethanol reacts with excess acidified K2Cr 2O7 to produce
Odpoveď
(C)
ethanoic acid
45
Dry hydrogen chloride when dissolved in methylbenzene
Odpoveď
(C)
does not affect litmus paper
46
A consequence of global warming is
Odpoveď
(B)
flooding
47
The major product in the solvay process is
Odpoveď
(B)
Na 2CO 3
48
Which of the following alloys does not contain copper? l. Brass II. Bronze III. Steel
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(C)
lll only
49
The electron configuration of carbon atom in its excited state is [ 6C]
Odpoveď
(D)
1s 22s12px12py12pz1
50
The electron configuration of carbon atom in its excited state is [ 6C]
