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NEET Chemistry Solved Question Paper 2015

Multiple Choice Questions

Which of the following species contains an equal number of σ and Π bond?

HCO₃^-
XeO₄
(CN)₂
(CN)₂

2307 Views

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Ar < K⁺< Ca²⁺
Ca²⁺ < Ar < K⁺
Ca²⁺ < K⁺ < Ar
Ca²⁺ < K⁺ < Ar

1221 Views

Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

Mg>Ca>Sr>Ba
Ca>Sr>Ba>Mg>
Sr>Ca>Mg>Ba
Sr>Ca>Mg>Ba

734 Views

Which of the following pairs of ions are isoelectronic and isostructural?

$CO subscript 3 superscript 2 minus end superscript comma space SO subscript 3 superscript 2 minus end superscript$
$ClO subscript 3 superscript minus comma space CO subscript 3 superscript 2 minus end superscript$
$SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus$
$SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus$

2058 Views

Magnetic moment 2.84 BM is given by (At. no. Ni= 28, Ti= 22, Cr=24, Co = 27)

Ni²⁺
Ti³⁺
Cr³⁺
Cr³⁺

2504 Views

If the value of an equilibrium constant ofr particular reaction is 1.6 x10¹² then at equilibrium the system will contains

all reactants
mostly reactants
mostly products
mostly products

1313 Views

7.
The number of d- electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following?

S- electronic in Mg (Z=12)

p-electrons in Cl( Z=17)

d- electrons in Fe (Z=26)

d- electrons in Fe (Z=26)

p-electrons in Cl( Z=17)

Electronic configuration of Fe²⁺ is [Ar]3d⁶ 4s⁰
therefore, Number of electrons = 6
Mg- 1s² 2s² 2p⁶ (6s electrons)
It matches with the 6d electrons of Fe²⁺
Cl- 1s² 2s² 2p⁶ 3s² 3p⁵ (11 p electrons)
It does not match with the 6d electrons of Fe²⁺
Fe- [Ar] 3d⁶ 4s² (6d electrons)

It does not match with the 6d electrons of Fe²⁺
Ne- 1s² 2s² 2p⁶ 3s² 3p ⁶ (6p electrons)
It matches with the 6d electrons of Fe²⁺.
Hence, Cl has 11 p electrons which do not match in number with 6d electrons of Fe²⁺

984 Views

The angular momentum of electrons in d orbital is equal to

$square root of 6 space h$
$square root of 2 straight h$
$2 square root of 3 straight h$
$2 square root of 3 straight h$

827 Views

The K_sp of Ag₂CrO₄, AgCl, AgBr and AgI are respectively, 1.1 x 10^-12, 1.8 x 10^-11, 8.3 x 10^-17. Which one of the following salts will precipitate last if AgNO₃ solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na₂CrO₄?