1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of the first three radii of Bohr's atom is:

A
$$1: 4: 9$$
B
$$1: 5: 9$$
C
$$1:4:27$$
D
$$1: 2: 3$$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following statement is not true about glucose?

A
Glucose does not give Schiff's reagent test
B
Glucose on reaction with $$\mathrm{HI}$$ and red $$\mathrm{P}$$ at $$373 \mathrm{~K}$$ gives a mixture of cyclohexane and 1-iodohexane
C
Both $$\alpha$$-D-glucose and $$\beta$$-D-glucose undergo mutarotation in aqueous solutions
D
Glucose reacts with hydroxylamine to form an oxime
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The type of hybridisation and the spin only magnetic moment for the complex $$[\mathrm{Ni}(\mathrm{CO})_4]$$ are respectively:

A
$$\mathrm{sp}^3, \sqrt{8} \mathrm{~BM}$$
B
$$\mathrm{dsp}^2$$, zero
C
$$\mathrm{sp}^3$$, zero
D
$$\mathrm{dsp}^2, \sqrt{8} \mathrm{~BM}$$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Consider the following statements in respect of lanthanides, which of the statements are incorrect?

(i) $$\mathrm{La}(\mathrm{OH})_3$$ is least basic among the hydroxides of lanthanides

(ii) The lanthanide ions $$\mathrm{Yb}^{2+}, \mathrm{Lu}^{3+}$$ and $$\mathrm{Ce}^{4+}$$ are diamagnetic in nature.

(iii) $$\mathrm{Ce}^{4+}$$ can act as an oxidising agent

(iv) $$\operatorname{Ln}$$ (III) compounds are generally colourless

(v) Ionic radii of $$\mathrm{Ce}^{3+}$$ is greater than $$\mathrm{Yb}^{3+}$$

A
(i), (ii) and (iii)
B
(i) and (iv)
C
(iii), (iv) and (v)
D
(iii) and (iv)
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12