CBSE Class XII Chemistry Part 1 - Practice Test

Sunita set up three cells with external potential applied. The potential is increased slowly, till the opposing voltage reaches the value of 1.1 V. Which of the following statements is INCORRECT?

Two compounds M and N have the general formula CnH2nO but different structural formulae. Compound N belongs to that homologous series where the first member contains 3 carbon atoms. Compound M reacts with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield a hemiacetal. Identify the homologous series to which compounds M and N belong to?

During a quiz competition, team A and team B have to answer a tie question on the characteristics of RNA. What is the expected result of the quiz and why?

What will be the change in the hybridisation of C when a nucleophile attacks the electrophilic centre of the carbonyl group?

Four compounds, CH3Cl, CH3Br, C2H5Br and C3H7I are represented by the letters M, N, O and P in the table below (in random order). The boiling points are also given. Which of the four compounds does 'N' most likely represent?

Based on the standard electrode potential graph given, which element will MOST LIKELY be involved in the following reaction: Metal + conc. sulphuric acid → Metal sulphate + sulphur dioxide + water?

The table given below shows the results of three experiments on the rate of the reaction between compounds P and Q at a constant temperature. Based on the data, what will be the rate equation for the reaction between P and Q?

The table below shows the KH values for some gases at 293 K and at the same pressure. In which of the following are the gases arranged in their decreasing order of solubility (from left to right)?

Sampriti took 4 acids. Help her to arrange the acids from left to right, in the increasing order of their acidity: 2,4,6-Trinitrophenol, acetic acid, phenol, and benzoic acid.

An archeologist found that the percentage of carbon-14 in a wooden artifact was 20% of what carbon-14 would have been in the wood when it was cut from the tree. What would be the approximate age of this wooden artifact? (Given the half-life of carbon-14= 5730 years)

Sourima was having a severe headache. She took a medicine to relieve her pain. The medicine is industrially prepared by:

Which of the following options give the correct arrangement of the atomic radii of the 3d, 4d, and 5d transition series of elements?

Assertion (A): 2-Methoxy-2-methyl propane reacts with hydrogen iodide to form methyl alcohol and 2-Iodo-2-methylpropane. Reason (R): The reaction given in (A) follows SN2 mechanism. Which of the following is correct?

Assertion (A): In acetaldehyde, the carbonyl carbon acts as a Lewis acid and the carbonyl oxygen acts as a Lewis base. Reason (R): Carbonyl compounds have substantial dipole moments. Which of the following is correct?

Assertion (A): Denaturation of protein does not change the primary structure of proteins. Reason (R): The bonding between the carbon and hydrogen atoms during denaturation of proteins remains intact. Which of the following is correct?

Assertion (A): Copper does not form copper (II) sulphate on reaction with dil. sulphuric acid. Reason (R): The standard potential for Cu+2|Cu electrode is negative. Which of the following is correct?

Given a graph of concentration of reactant vs time for a reaction showing a linear decrease, what will be the order of this reaction?

Which colligative property is preferred over others for determining molar masses of biomolecules and why?

In which of the two compounds CH3CH2CH2Cl or C6H5Cl will the C-Cl bond be longer? Why?

Match: (a) Cyclohexene heated in the presence of KMnO4 and H2SO4 gives (b) Propanenitrile hydrolysed after reduction in the presence of stannous chloride and hydrochloric acid gives

Glucose does not give a positive result with the Schiff's reagent in the Schiff's test. What type of carbonyl group is present in a glucose molecule?

A metal (M) forms two different compounds O and P with two different ligands. Ligand present in compound O is Cl- and that in compound P is CN-. The metal M has 4 electrons in the d orbital. What type of complex will compound P form?

Abhisrija arranged two setups P (Cu wire) and Q (NaCl solution with electrodes). What happens to the chemical composition of NaCl and Cu wire when current is passed through both setups for a prolonged period of time?

Which structure represents 3-Methylphenol?

If acetaldehyde, propane, propanone, acetic acid, and ethyl alcohol are arranged in the increasing order of their boiling points, which two compounds are expected to be at the third and the fourth position?

Write a balanced equation for the reaction between glucose and hydrogen cyanide. What inference can we draw from it?

For SN1 reactions, which reaction is expected to be slower: (CH3)3CCl + H2O → (CH3)3COH + HCl or C6H5Cl + H2O → C6H5OH + HCl?

What is the unit for rate of reaction in SI units?

One of the most distinctive properties of transition metal complexes is their wide range of colours. What is the type of ligand 'en' that demonstrates the influence of ligand on colours of complex compounds?

Conductivity measurements are used routinely in many industrial and environmental applications. The conductivity of a sample of water taken from a borewell is given as 0.13 S/m at STP. A conductivity cell is created using the water above. The resistance of the cell is found to be 10 ohms. What is the cell constant of the cell given above?