1
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
2
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
$${1 \over {16}}$$
3
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

The incorrect method to synthesize benzaldehyde is

A
NEET 2022 Phase 2 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English Option 1
B
NEET 2022 Phase 2 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English Option 2
C
NEET 2022 Phase 2 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English Option 3
D
NEET 2022 Phase 2 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 10 English Option 4
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

An energy of 484 J is spent in increasing the speed of a flywheel from 60 rpm to 360 rpm. The moment of inertia of the flywheel is :

A
0.07 kg-m2
B
0.7 kg-m2
C
3.22 kg-m2
D
30.8 kg-m2
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