Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following reactions will NOT give primary amine as the product?
Isocyanide reduction (C) gives a secondary amine (CH₃–NH–CH₃). Others give 1° amines.
Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell is: NH₃, AlCl₃, BeCl₂, CCl₄, PCl₅
AlCl₃ (6e), BeCl₂ (4e), PCl₅ (10e) — three species without octet. NH₃ and CCl₄ have 8e.
Which of the following statements are NOT correct?
A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to study reaction mechanism. C. Hydrogen is used to make saturated fats from oils. D. The H–H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element. E. Hydrogen reduces ion oxides of metals that are more active than iron.
Choose the most appropriate answer:
D wrong (H–H dissociation enthalpy is the highest). E wrong (H₂ reduces oxides of metals LESS active than Fe, e.g., Cu, Ag).
Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is:
Decarboxylation: CH₃COONa + NaOH (CaO, Δ) → CH₄ + Na₂CO₃. 2 mol CH₄ = 32 g.
The number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are:
Pyridine (C₅H₅N): 5 C–H σ + 6 ring σ = 11 σ; 3 ring π; 1 lone pair on N.
Which one of the following statements is correct?
Mg²⁺ is required for neuromuscular contraction and nerve impulse transmission.
Given below are two statements: one is labelled Assertion A and the other Reason R.
A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.
R: The deep blue solution is due to the formation of amide.
Blue colour due to ammoniated electron, not amide. A correct; R false.
Which amongst the following options is the correct graphical representation of Boyle's Law?
Boyle: $PV =$ const $\Rightarrow P = (\text{const})/V$, so $P$ vs $1/V$ is a straight line through origin. With higher T the slope (= nRT) is larger.
The correct order of energies of molecular orbitals of N₂ molecule is:
For N₂ (Z $\le$ 7) $s$–$p$ mixing pushes $\sigma 2p_z$ above the degenerate $\pi 2p$ pair.
Some tranquilizers are listed below. Which one from the following belongs to barbiturates?
Veronal (barbital) is a barbituric-acid derivative.
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