Q121. How many significant figures are present in perimeter of square ?
Anonymous Quiz
11%
100
0%
2
22%
3
67%
infinity
Q122. Substract 0.2 from 5.27 and give significant figures?
Anonymous Quiz
56%
5.1
22%
5.0
22%
5.07
0%
5.06
Q123. Calculate number of atoms present in one line of water ( density of water is 1g/mL ) ?
Anonymous Quiz
11%
116.5 NA atoms
56%
160.5 NA atoms
33%
166.5 NA atoms
0%
106.5 NA atoms
Q124. Weight of 1L gas is 2g then find out its VD and Molecular mass?
( given density of H2 = 0.000089 )
( given density of H2 = 0.000089 )
Anonymous Quiz
18%
40.8
36%
22.4
27%
44.8
18%
None
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Q125. 11g of gas occupy 5.6 litres of volume at STP. the gas is
Anonymous Quiz
46%
CO2
31%
N2O4
15%
CO
8%
NO
Q126.
840g of MgCO3 sample ( % purity = 50% ) decomposed to give MgO + CO2 . Calculate mass of MgO and Volume of CO2 produced ?
Note : [ solution is attached with questions, attempt first by yourself ]
840g of MgCO3 sample ( % purity = 50% ) decomposed to give MgO + CO2 . Calculate mass of MgO and Volume of CO2 produced ?
Note : [ solution is attached with questions, attempt first by yourself ]
Anonymous Quiz
20%
300g and 132 L
20%
200g and 142L
40%
400g and 112 L
20%
200g and 112 L
Q127. Mol fraction of A in H20 is 0.2 Molality of A in H20 ?
Anonymous Quiz
33%
0.8
44%
13.8
17%
12.8
6%
14.8
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Q1. The period number in the long form of the periodic table is equal to
[ NCERT EXAMPLER ]
[ NCERT EXAMPLER ]
Anonymous Quiz
11%
magnetic quantum number of any element of the period
22%
atomic number of any element of the period
67%
maximum principal quantum number of any element of the period
0%
maximum azimuthal quantum number of any element of the period
Q2. Modern periodic table is based on atmoic number of elements . experiment which proved significance of atomic number was
Anonymous Quiz
18%
mullikans oil drop experiment
71%
moseley's work on X ray spectra
12%
braggs work on X ray diffraction
0%
discovery of X rays by Rontgen
Q3
Statement 1 : Periodic law revealed important analogies among the 94 naturally occurring elements [ Np & Pu like Actinium & proactinium are also found in pitch blende –an ore of uranium)
statement 2 : It stimulated interest in Inorganic Chemistry
Statement 1 : Periodic law revealed important analogies among the 94 naturally occurring elements [ Np & Pu like Actinium & proactinium are also found in pitch blende –an ore of uranium)
statement 2 : It stimulated interest in Inorganic Chemistry
Anonymous Quiz
25%
Statement 1 is incorrect statement 2 is correct
13%
Statement 1 is correct statement 2 is incorrect
13%
Statement 1 is incorrect statement 2 is incorrect
50%
Statement 1 is correct statement 2 is correct
Q4. Periodic Law is essentially the consequence
of the following ?
of the following ?
Anonymous Quiz
0%
atomic number is equal to the nuclear charge ( no of protons) or no of electrons in a neutral atom
0%
Easy to visualize significance of quantum no & electronic configurations in periodicity of elements
38%
periodic variation in electronic configurations determine physical & chemical properties of elements
62%
all of above