(i) Which of the following statements is wrong about alkanes ?
(A) They are all saturated hydrocarbon.
(B) They can undergo addition as well as substitution reaction.
(C) They are almost non polar in nature.
(D) On complete combustion give out carbon dioxide and water.

Choose the most appropriate answer for each of the following: Identify the statement which does not describe the property of alkenes : (A) They are unsaturated hydrocarbons (B) They decolourise bromine water (C) They can undergo addition as well as substitution reactions (D) They undergo combustion with oxygen forming carbon dioxide and water.

Identify a statement that is incorrect about alkanes. (i) They are hydrocarbons. (ii) There is single covalent bond between carbon and hydrogen. (ii) They can undergo addition as well as substitution reactions. (iv) On complete combustion with oxygen, they produce carbon dioxide and water

Give two uses of the following components present in air : (a) oxygen (b) nitrogen (c ) carbon dioxide (d) water vapour

Which of the following statements is not true about glucose? (a)It is an aldohexose (b)On heating with HI it forms n-hexane (c)It is present in furanose form (d)It does not give 2,4-DNP test

Which of the following statements is/are wrong about pericyclic reaction ? (a) It is intramolecular cyclisation of acyclic compound. (b) It is intermolecular cyclisation of acyclic compound. (c) It proceeds via concerted mechanism in which breaking and formation of bonds take place simultaneously. (d) It proceed via free-radical mechanism.

Which of the following statement is not correct about an inert electrode in a cell? (a) It does not participate in the cell reaction. (b) It provides surface either for oxidation or for reduction reaction. (c) It provides surface for conduction of electrons. (d) It provides surface for redox reaction.

Which one of the following statements is correct about the human circulatory system? (A) Blood transports only oxygen and not carbon dioxide. (B) Human heart has five chambers. (C) Valves ensure that the blood does not flow backwards. (D) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.

which of the following is true about the value of refractive index of quartz glass ? a) Same in all directions b) Different in all directions c) Can not be measured d) Always zero

Which of the following statement is not true about amorphous solids? (a) On heating, they may become crystalline at certain temperature. (b) They may become crystalline on keeping for long time. (c) Amorphous solids can be moulded by heating. (d) They are anisotropic in nature.

Which metal gives hydrogen with all of the following: water, acids, alkalis ? (A) Fe (B) Zn (C) Mg (D) Pb