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