1
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus

Which one of the following is not a calcination reaction?

A
CaCO3 + 2HCl $$\buildrel \Delta \over \longrightarrow $$ CaCl2 + H2O + CO2
B
ZnCO3 $$\buildrel \Delta \over \longrightarrow $$ ZnO + CO2
C
Fe2O3 . xH2O $$\buildrel \Delta \over \longrightarrow $$ Fe2O3 + xH2O
D
CaCO3 . MgCO3 $$\buildrel \Delta \over \longrightarrow $$ CaO + MgO + 2CO2
2
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

The incorrect method for the synthesis of alkenes is

A
Treating vicinal dihalides with Zn metal
B
Treating of alkynes with Na in liquid NH3
C
Heating alkyl halides with alcoholic KOH
D
Treating alkyl halides in aqueous KOH solution
3
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $$\times$$ 105 J mol$$-$$1. What is the minimum energy needed to remove an electron from the metal?

(h = 6.626 $$\times$$ 10$$-$$34 Js, c = 3 $$\times$$ 108 ms$$-$$1, NA = 6.022 $$\times$$ 1023 mol$$-$$1)

A
2.31 $$\times$$ 105 J mol$$-$$1
B
2.31 $$\times$$ 106 J mol$$-$$1
C
3.84 $$\times$$ 104 J mol$$-$$1
D
3.84 $$\times$$ 10$$-$$19 J mol$$-$$1
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

What fraction of Fe exists as Fe(III) in Fe0.96O ?

(Consider Fe0.96O to be made up of Fe(II) and Fe(III) only)

A
$${1 \over {20}}$$
B
$${1 \over {12}}$$
C
0.08
D
$${1 \over {16}}$$
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