Question

The atomicity of K2Cr2O is
1) 9
2) 11
3) 10
4) 12
The formula for quicklime is
1) CaCl₂
2) CaCO3
3) Ca(OH)2
4) Cao
The element present in diamond is
1)C
2H
3N
4) Ag
The symbol of cadmium is
1) Ca
2) Cu
3) cm
4) Cd
All noble gas molecules are
1) Monoatomic 2) Diatomic
3) Triatomic
4) Both 1 & 2
The valency of nitrogen in NH3 is
1) 1
23
3) 4
4) 5
The formula of ethanol is C2H5 - OH. What will be its molecular mass?
1) 46 u
2) 34 u
3) 34 g
4) 469
Number of moles present in 28g of nitrogen atoms are
1) 1 mole
2) 2.3 moles
3) 0.5 mole
4) 2 moles
The molecular mass of x is 106.x can be
1) CaCO3
2) 503
3) Na2CO3
4) Naci
Which among the following is not a postulate of Dalton's atomic theory?
1) Atoms cannot be created or destroyed
2) Atoms of different elements have different sizes, masses and chemical properties
3) Atoms of same elements can combine in only one ratio to produce more than any one compound
4) Atoms are very tiny particles which cannot be further divided
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Answer 1

Answer:

the atomicity of K2Cr2O7 is 11

option 2)

the formula of quick lime is CaO

option 4)

The element present in diamond is C i.e. carbon

option 1)

The symbol of cadmium is Cd

option 4)

All noble gas molecules are diatomic.

option 2)

Valency of nitrogen in NH3 is 3

option 2)

the formula of ethanol is 46.9g

option 4)

Number of moles present in 28g of nitrogen atoms are 2moles.

weight is nitrogen is 14u so for finding number of moles divide given weight by atomic weight

i.e. 28/14 = 2moles

option 4)

Na2CO3 has 106 molecular mass.

add all the masses of constituent elements.

option 3)

Atoms of same elements can combine in only one ratio to produce more than any one compound.

this is not in Dalton's theory.

option 3)

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