Arrange the following in:
Increasing acidic property:
ZnO, Na2O2, P2O5, MgO
Răspuns
(C)
Na2O2 < MgO < ZnO < P2O5
2
Five ml of 8N nitric acid, 4.8ml of 5N hydrochloric acid and a certain volume of 17M sulphuric acid are mixed together and made upto 2 litre. Thirty ml of this acid mixture neutralise 42.9 ml of sodium carbonate solution containing one gram of Na2CO3.10H2O in 100 ml of water. Calculate the amount in gram of the sulphate ions in solution.
Răspuns
(C)
6.3648 g
3
Bohr Model can explain
Răspuns
(B)
spectrum of an atom or ion containing one electron only
4
The radius of an atomic nucleus is of the order of
Răspuns
(B)
10-13 cm
5
Electromangnetic radiation with maximum wavelength is:
Răspuns
(B)
radiowave
6
Give reasons why the ground state outermost electronic configuration of silicon is:
Răspuns
C
D
E
7
What is the maximum number of electrons that may be present in all atomic orbitals with principal quantum number 3 and azimuthal quantum number 2?
Răspuns
10
8
On Mulliken scale, the average of ionization potential and electron affinity is known as _____.
Răspuns
(C)
Electronegativity
9
Arrange the following in:
Decreasing ionic size:
Mg2+, O2-, Na+, F-
Răspuns
(B)
O2- > F- > Na+ > Mg2+
10
Arrange the following in:
Increasing first ionisation potential :
Mg, Al, Si, Na
Răspuns
(B)
Na < Al < Mg < Si
11
All molecules with polar bonds have dipole moment.
Răspuns
(B)
FALSE
12
SnCl2 is a non-linear molecule
Răspuns
(A)
TRUE
13
The molecule having one unpaired electron is
Răspuns
(A)
NO
14
How many sigma bonds and how many pi-bonds are present in a benzene molecule?
Răspuns
(E)
12 \(\sigma\), 3 \(\pi\)
15
Kinetic Energy of a Molecule is zero at 0oC.
Răspuns
(B)
FALSE
16
A gas in a closed container will exert much higher pressure due to gravity at the bottom than at the top.
Răspuns
(B)
FALSE
17
Rate of diffusion of a gas is
Răspuns
(C)
inversely proportional to the square root of its molecular weight.
18
Calculate the root mean square velocity of ozone kept in a closes vessel at 20oC and 82 cm mercury pressure.
Răspuns
(B)
3.9 x 10^4 cm/sec
19
Sodium dissolved in liquid ammonia conducts electricity because ________.
Răspuns
(D)
of solvated electrons.
20
Hydrogen gas will not reduce
Răspuns
(D)
heated aluminium oxide
21
Molecular formula of Glauber's salt is:
Răspuns
(D)
Na2SO4.10H2O
22
The oxide that gives hydrogen peroxide on treatment with a dilute acid is
Răspuns
(B)
Na2O2
23
Write down the balanced equations for the reaction when:
Calcium phosphate is heated with a mixture of sand and carbon;
