A cylinder contains hydrogen gas at a pressure of \(249~\text{kPa}\) and temperature \(27^\circ\text{C}.\) Its density is:
(\(R=8.3~\text{J mol}^{-1} \text {K}^{-1}\))
1. \(0.2~\text{kg/m}^{3}\)
2. \(0.1~\text{kg/m}^{3}\)
3. \(0.02~\text{kg/m}^{3}\)
4. \(0.5~\text{kg/m}^{3}\)
The solids which have the negative temperature coefficient of resistance are:
| 1. | insulators only |
| 2. | semiconductors only |
| 3. | insulators and semiconductors |
| 4. | metals |
| 1. | \(A=1,B=1,Y=1\) |
| 2. | \(A=0,B=1,Y=1\) |
| 3. | \(A=1,B=0,Y=0\) |
| 4. | \(A=0,B=0,Y=1\) |
Which of the following graph represents the variation of resistivity () with temperature (\(T\)) for copper?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
A resistance wire connected in the left gap of a meter bridge balances a \(10~\Omega\) resistance in the right gap at a point which divides the bridge wire in the ratio \(3:2\). lf the length of the resistance wire is \(1.5~\text{m}\), then the length of \(1~\Omega\) of the resistance wire will be:
| 1. | \(1.0\times 10^{-1}~\text{m}\) | 2. | \(1.5\times 10^{-1}~\text{m}\) |
| 3. | \(1.5\times 10^{-2}~\text{m}\) | 4. | \(1.0\times 10^{-2}~\text{m}\) |
Consider the reaction,
This reaction will be the fastest in:
1. Ethanol
2. Methanol
3. N, N'-dimethylformamide (DMF)
4. Water
Identify the incorrect statement.
| 1. | The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes. |
| 2. | Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals. |
| 3. | The oxidation states of chromium in CrO42– and Cr2O72– are not the same. |
| 4. | Cr2+(d4) is a stronger reducing agent than Fe2+(d6) in water. |
Identify the correct statements from the following:
| (a) | \(\mathrm{CO}_2(\mathrm{~g})\) is used as a refrigerant ice cream and frozen food. |
| (b) | The structure of \(\mathrm{C}_{60} \) customs12 six carbon rings and 25 five carbon rings |
| (c) | ZSM-5, a type of zeolite, is used to convert alcohol into gasoline. |
| (d) | CO is a colorless and odorless gas. |
| 1. | (a) and (c) only | 2. | (b) and (c) only |
| 3. | (c) and (d) only | 4. | (a), (c) and (d) only |
The end product (C) in the below-mentioned reaction is:
\(H_3C-Br\xrightarrow{\bf KCN }A\xrightarrow{ \bf H_3O^+~~}B\xrightarrow[\bf\text{Ether}]{~~LiAlH_4~~}C\)
1. Acetone
2. Methane
3. Acetaldehyde
4. Ethyl alcohol
The reaction between benzaldehyde and acetophenone in the presence of dilute NaOH is known as:
1. Cannizzaro's reaction
2. Cross Cannizzaro's reaction
3. Cross aldol condensation
4. Aldol condensation
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