Q&A Bank
Questions & Answers
1,481 answers across all subjects
ScienceClass 10CBSE
1. The name of the compound CH3 — CH2 — CHO is (a) Propanal (b) Propanone (c) Ethanol Ethanal
ScienceClass 10CBSE
1. Which of the following does not belong to the same homologous series? (a) CH4 (b) C2 H6 (c) C3 H8 (d) C4 H8
ScienceClass 10CBSE
1. Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of (a) helium (b) neon (c) argon krypton
ScienceClass 10CBSE
1. Mineral acids are stronger acids than carboxylic acids because (i) mineral acids are completely ionised (ii) carboxylic acids are completely ionised (iii) mineral acids are partially ionised (iv) carboxylic acids are partially ionised (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (ii) (iii) and (iv)
ScienceClass 10CBSE
1. Pentane has the molecular formula C5 H12. It has (a) 5 covalent bonds (b) 12 covalent bonds (c) 16 covalent bonds 17 covalent bonds
ScienceClass 10CBSE
1. In the soap micelles (a) the ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster. (b) ionic end of soap is in the interior of the cluster and the carbon chain is out of the cluster. (c) both ionic end and carbon chain are in the interior of the cluster both ionic end and carbon chain are on the exterior of the cluster
ScienceClass 10CBSE
1. Chlorine reacts with saturated hydrocarbons at room temperature in the (a) absence of sunlight (b) presence of sunlight (c) presence of water presence of hydrochloric acid
ScienceClass 10CBSE
1. Identify the unsaturated compounds from the following (i) Propane (ii) Propene (iii) Propyne (iv) Chloropropane (a) (i) and (ii) (b) (ii) and (iv) (c) (iii) and (iv) (ii) and (iii)
ScienceClass 10CBSE
(a) hydrophilic head and a hydrophobic tail (b) hydrophobic head and a hydrophilic tail (c) hydrophobic head and a hydrophobic tail hydrophilic head and a hydrophilic tail
ScienceClass 10CBSE
1. In which of the following compounds, — OH is the functional group? (a) Butanone (b) Butanol (c) Butanoic acid Butanal
ScienceClass 10CBSE
1. Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of (a) Addition reaction (b) Substitution reaction (c) Displacement reaction Oxidation reaction
ScienceClass 10CBSE
1. CH3 – CH2 – OH Alkaline KMnO Heat 4 + → CH3 – COOH In the above given reaction, alkaline KMnO4 acts as (a) reducing agent (b) oxidising agent (c) catalyst (d) dehydrating agent
ScienceClass 10CBSE
1. Buckminsterfullerene is an allotropic form of (a) phosphorus (b) sulphur (c) carbon tin
ScienceClass 10CBSE
1. A molecule of ammonia (NH3 ) has (a) only single bonds (b) only double bonds (c) only triple bonds two double bonds and one single bond
ScienceClass 10CBSE
1. Which of the following statements are usually correct for carbon compounds? These (i) are good conductors of electricity (ii) are poor conductors of electricity (iii) have strong forces of attraction between their molecules (iv) do not have strong forces of attraction between their molecules (a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (ii) and (iv)
ScienceClass 10CBSE
1. Carbon exists in the atmosphere in the form of (a) carbon monoxide only (b) carbon monoxide in traces and carbon dioxide (c) carbon dioxide only coal
ScienceClass 10CBSE
A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt and why does it show such a behaviour? Give the reaction involved.
ScienceClass 10CBSE
A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by–product of chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.
ScienceClass 10CBSE
A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.
ScienceClass 10CBSE