Question

please answer my questions please please please it's urgent don't thought it is a test it is just my homework so please answer my questions



1 Isotopes of an element have-- *
same mass no
different chemical properties
different atomic no
different no of neutrons
Other:

This is a required question
2 fog is a colloidal solution of--- *
liquid in gas
gas in liquid
gas in solid
solid in gas
3 Cobalt-60 is used in the treatment of-- *
goitre
cancer
nuclear isotope
typhoid
4 In dense forest the path of sunlight is visible is due to-- *
Brownian motion
electrophoresis
Tyndal effect
none of these
5 What is the mass of 3 mole of carbon dioxide-- *
112 gm
135 gm
132 gm
142 gm
6 The molecular mass of calcium nitrate is -- *
164 u
174 u
184u
194 u
7 The mixture of sand and ammonium chloride can be separated by-- *
centrifugation
evaporation
sublimation
distillation
8 The no of isotopes present in hydrogen is-- *
2
3
4
5
9 The no of electrons preent in outermost shell of Na+ ion is- *
2
1
8
3
10 The correct chemical formula of aluminium hydrogen carbonate-- *
Al(CO3)3
Al(HCO3)3
Al2(HCO3)3
Al(HCO3)2
11 In burning of candle what type of changes takes place-- *
physical change
chemical change
both physical and chemical change
none of these
12 In an element no of neutron is 14 and mass no is 28. Identify the element-- *
P
Si
S
Al
13 Which of the following is considered as one of the conclusion of Rutherford alpha ray scattering experiment-- *
Most of the places in an atom are empty.
alpha particles are positively charged particle.
electrons are moving around the nucleus in a fixed orbit.
there is repulsive forces among the electrons.
14 Name the technique that can be used to separate different gases from air, *
simple distillation
crystalisation
fractional distilation
sublimation
15 72 gm of water constitute how much mole-- *
3 mole
5 mole
4 mole
2 mole
16 Atomicity of neon and ozone are *
3 and o respectively
1 and 3 respectively.
1 and 2 respectively.
0 and 3 respectively
17 Maximum no of electrons present in second orbit of Bohrs model -- *
2
8
18
32
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Answer 1

Answer:

7 th one answer sublimation process