Incorrect statement among the following is:
| 1. | Quartz is extensively used as a piezoelectric material. |
| 2. | Silicones are a group of organosilicon polymers, which have (-R2SiO-) as a repeating unit. |
| 3. | Basic structural unit in silicates is the SiO44– tetrahedron. |
| 4. | Feldspars are not aluminosilicates. |
Subtopic: Properties of Structure of SiO2 & Other Compounds |
71%
Level 2: 60%+
NEET - 2013
Hints
The outer orbitals of C in an ethene molecule can be considered to be hybridized to give three equivalent sp2 orbitals. The total number of sigma (\(\sigma\)) and pi(\(\pi\)) bonds in ethene molecule are:
1. 3 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
2. 4 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
3. 5 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
4. 1 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
1. 3 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
2. 4 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
3. 5 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
4. 1 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
Subtopic: Hybridisation & Structure of Carbon Compounds |
84%
Level 1: 80%+
NEET - 2013
Hints
Which condition is not satisfied by an ideal solution?
| 1. | \(\Delta_{mix} V\) = 0 | 2. | \(\Delta_{mix} S\) = 0 |
| 3. | Obeyance to Roult's Law | 4. | \(\Delta_{mix} H\) = 0 |
Subtopic: Raoult's Law |
89%
Level 1: 80%+
NEET - 2013
Hints
The dissociation constant of a weak acid is \(1\times 10^{-4}\) in order to prepare a buffer solution with pH=5 the [salt]/ [Acid] ratio should be:
| 1. | 4 : 5 | 2. | 10 : 1 |
| 3. | 5 : 4 | 4. | 1 : 10 |
Subtopic: Buffer |
74%
Level 2: 60%+
NEET - 2013
Hints
What is the density of N2 gas at 227 °C and 5.00 atm pressure?
(R = 0.082 L Atm K–1 mol–1)
1. 1.40 g/L
2. 2.81 g/L
3. 3.41 g/L
4. 0.29 g/L
(R = 0.082 L Atm K–1 mol–1)
1. 1.40 g/L
2. 2.81 g/L
3. 3.41 g/L
4. 0.29 g/L
Subtopic: Gas Laws |
74%
Level 2: 60%+
NEET - 2013
Hints
The correct IUPAC name for [CrF2(en)2]Cl is:
| 1. | Chlorodifluoridoethylenediaminechromium(III) chloride |
| 2. | Bis-(ethylenediamine)difluoridochromium(III) chloride |
| 3. | Difluorobis-(ethylenediamine)chromium(III) chloride |
| 4. | Chlorodifluoridobis(ethylenediamine)chromium (III) |
Subtopic: Introduction, Classification and Nomenclature |
81%
Level 1: 80%+
NEET - 2013
Hints
Dettol is the mixture of:
1. Chloroxylenol and Bithionol
2. Chloroxylenol and Terpineol
3. Phenol and Iodine
4. Terpineol and Bithionol
1. Chloroxylenol and Bithionol
2. Chloroxylenol and Terpineol
3. Phenol and Iodine
4. Terpineol and Bithionol
Subtopic: Classification of Medicines |
70%
Level 2: 60%+
NEET - 2013
Hints
A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of the reaction is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 0 |
Subtopic: Order, Molecularity and Mechanism |
80%
Level 1: 80%+
NEET - 2013
Hints
The values of \(K_{sp}\) of CaCO3 and CaC2O4 are 4.7 × 10–9 and 1.3 × 10–9 respectively at 25°C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in the water?
1. 5.8 × 10–5 M
2. 6.8 × 10–5 M
3. 3.6 × 10–5 M
4. 7.7 × 10–5 M
1. 5.8 × 10–5 M
2. 6.8 × 10–5 M
3. 3.6 × 10–5 M
4. 7.7 × 10–5 M
Subtopic: Solubility Product |
Level 3: 35%-60%
NEET - 2013
Hints
The species/pair among the following that have sp3 hybridization is:
1. SiF4, BeH2
2. NF3,H2O
3. NF3,BF3
4. H2S, BF3
1. SiF4, BeH2
2. NF3,H2O
3. NF3,BF3
4. H2S, BF3
Subtopic: Hybridisation |
78%
Level 2: 60%+
NEET - 2013
Hints
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