In DNA, the linkages between different nitrogenous bases are:
1. Phosphate linkages
2. H-bonding
3. Glycosidic linkages
4. Peptide linkages
1. Phosphate linkages
2. H-bonding
3. Glycosidic linkages
4. Peptide linkages
Subtopic: DNA, RNA & Metal Ions |
68%
Level 2: 60%+
NEET - 2013
Hints
Which complex among the following exhibits a paramagnetic nature?
1. [Co(NH3)6]3+
2. [Pt(en)Cl2]
3. [CoBr4]2–
4. Mo(CO)6
(At. No. Mo = 42, Pt = 78)
1. [Co(NH3)6]3+
2. [Pt(en)Cl2]
3. [CoBr4]2–
4. Mo(CO)6
(At. No. Mo = 42, Pt = 78)
Subtopic: VBT, CFT & their Limitations |
76%
Level 2: 60%+
NEET - 2013
Hints
Sc(Z = 21) is a transition element but Zn (Z = 30) is not because:
| 1. | Both Sc3+ and Zn2+ ions are colourless and form white compounds |
| 2. | In the case of Sc, 3d orbitals are partially filled but in Zn, these are fully filled. |
| 3. | The last electron is assumed to be added to the 4s level in the case of Zn |
| 4. | Both Sc and Zn do not exhibit variable oxidation states. |
Subtopic: d-Block Elements- Properties & Uses |
87%
Level 1: 80%+
NEET - 2013
Hints
In an experiment, it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3. Which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine)?
1. X2Cl2
2. XCl2
3. XCl4
4. X2Cl
1. X2Cl2
2. XCl2
3. XCl4
4. X2Cl
Subtopic: Equation Based Problem |
68%
Level 2: 60%+
NEET - 2013
Hints
A diamagnetic compound among the following is:
1. [Co(F6)]3–
2. [Ni(CN)4]2–
3. [NiCl4]2–
4. [Fe(CN)6]3–
1. [Co(F6)]3–
2. [Ni(CN)4]2–
3. [NiCl4]2–
4. [Fe(CN)6]3–
Subtopic: VBT, CFT & their Limitations |
81%
Level 1: 80%+
NEET - 2013
Hints
A compound undergoes hydrolysis, resulting in the formation of two products. One of these products, when treated with sodium nitrite and hydrochloric acid, yields a product that does not respond to the iodoform test. The other product is capable of reducing Tollen's reagent and Fehling's solution.
Based on these observations, the compound is:
1. CH3CH2CH2NC
2. CH3CH2CH2CN
3. CH3CH2CH2ON = O
4. CH3CH2CH2CON(CH3)2
Based on these observations, the compound is:
1. CH3CH2CH2NC
2. CH3CH2CH2CN
3. CH3CH2CH2ON = O
4. CH3CH2CH2CON(CH3)2
Subtopic: Cyanides & Isocyanides |
Level 3: 35%-60%
NEET - 2013
Hints
Some reactions of amines are given. Which one is not correct?
| 1. |  |
| 2. | \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2+\mathrm{HNO}_2 \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{N}_2 \) |
| 3. | \(\mathrm{CH}_3 \mathrm{NH}_2+\mathrm{C}_6 \mathrm{H}_5 \mathrm{SO}_2 \mathrm{Cl} \rightarrow \mathrm{CH}_3 \mathrm{NHSO}_2 \mathrm{C}_6 \mathrm{H}_5 \) |
| 4. | \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}+\mathrm{NaNO}_2+\mathrm{HCl} \rightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{~N}-\mathrm{N}=\mathrm{O} \) |
Subtopic: Amines - Preparation & Properties |
56%
Level 3: 35%-60%
NEET - 2013
Hints
In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?
1. \(\mathrm{O_{2}\rightarrow O_{2}^{+} }\)
2. \(\mathrm{C_{2}\rightarrow C_{2}^{+} }\)
3. \(\mathrm{NO\rightarrow NO^{+} }\)
4. \(\mathrm{N_{2}\rightarrow N_{2}^{+} }\)
1. \(\mathrm{O_{2}\rightarrow O_{2}^{+} }\)
2. \(\mathrm{C_{2}\rightarrow C_{2}^{+} }\)
3. \(\mathrm{NO\rightarrow NO^{+} }\)
4. \(\mathrm{N_{2}\rightarrow N_{2}^{+} }\)
Subtopic: M.O.T |
74%
Level 2: 60%+
NEET - 2013
Hints
In the following reaction:
\(\text {HC} \equiv \text {CH} \xrightarrow [Hg^{2+}] { H_2SO_4} P \)
Product 'P' will not give
1. Tollen's reagent test
2. Fehling's solution
3. Victor Meyer test
4. Iodoform test
\(\text {HC} \equiv \text {CH} \xrightarrow [Hg^{2+}] { H_2SO_4} P \)
Product 'P' will not give
1. Tollen's reagent test
2. Fehling's solution
3. Victor Meyer test
4. Iodoform test
Subtopic: Aldehydes & Ketones: Preparation & Properties |
64%
Level 2: 60%+
NEET - 2013
Hints
The number of isomeric alcohols (excluding stereoisomers) of molecular formula C6H14O which give a positive iodoform test are:
1. Three
2. Four
3. Five
4. Two
1. Three
2. Four
3. Five
4. Two
Subtopic: Alcohols: Preparation & Properties |
Level 3: 35%-60%
NEET - 2013
Hints
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