The isotopic abundance of C-12 and C-14 is 98% and 2% respectively. What would be the number of C-14 isotope in 12 g carbon sample?

The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H₂S in the presence of conc. HCI (assuming 100% conversion) is:

Which of the following oxides is amphoteric in character?

Which property of white phosphorus is common to red phosphorous?

50 mL of each gas A and gas B takes 150 and 2008 respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

In sodium fusion test of organic compounds, the nitrogen of the organic compound is converted into

Calculate enthalpy for formation of ethylene from the following data
I. C_(graphite) + O₂(g) → CO₂(g); ΔH = - 393.5 kJ
II. H₂(g) + 1/2 O₂(g) → HO₂(l); ΔH = -286.2 kJ
III. C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(l);
ΔH = -1410.8 kJ

Inductive effect involves

Which of the following, the oxidation number of oxygen has been arranged in the increasing order?

Aluminium vessels should not be washed with materials containing washing soda since

Each of these questions contains two statements: Assertion and Reason. Each of these questions also has four alternative choices, only one of which is correct Answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Assertion A buffer solution has a capacity to resist the change in pH value on addition of small amount of acid or base to it.
Reason pH value of buffer solution does not change on dilution or on keeping for long.

Which of the following reagents convert propene to 1-propanol?

Glauber’s salt is

1 M solution of CH₃COOH should be diluted to .......... times so that pH is doubled.

A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly

Which one of the following is NOT a buffer solution?

2-hexyne gives trans-2 -hexene on treatm ent with

Which one of the following is expected to exhibit optical isomerism?
(en = ethylenediamine)

Toluene reacts with excess of Cl₂ in the presence of sunlight to give a product which on hydrolysis followed by the reaction with NaOH give

The unpaired electrons in Ni(CO)₄ are

A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K, the mixture reacts completely with 10/3 mole of O₂ to produce CO₂ and H₂O. The mole fraction of ethane and ethene in the mixture are 

(R = 0.0821 L atm K^-1 mol^-1) respectively

Identify the reaction which does not liberate hydrogen :

For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25°C. The value of standard Gibbs energy, ΔG° will be (F = 96500 C mol^-1)

When concentrated HCl is added to an aqueous solution of CoCl₂, its colour changes from reddish pink to deep blue. Which complex ion gives deep blue colour in this reaction?

The rate law for the chemical reaction 2NO₂Cl → 2 NO₂ + Cl₂ is rate = K [ NO₂Cl] The rate determining step is

The number of enantiomers of the compound CH₃CH(Br)CH(Br)COOH is:

At high pressure, Langmuir adsorption isotherm takes the form

Which of these have no unit?

Two concentration cells of Ag with Ag electrode in AgNO₃. In first cell, concentration of one electrode is 1 M and other electrode is 0.1 M and emf is 0.06 V. In second cell, concentration of one electrode is 1 M and other electrode is 0.01 M, calculate the emf of second cell.

The reactivity of metals with water is in the order of

Which of the following reaction is an example of calcination process?

In Cannizzaro reaction given below 2PhCHO  PhCH₂OH + PhCO^-₂ the slowest step is:

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (Hln) and base (In^- ) forms of the indicator by the expression

Transition metals usually exhibit highest oxidation states in their

In lake test of Al³⁺ ion, there is formation of coloured floating lake. It is due to

Which of the following compounds is aromatic alcohol?

Which of the following fact(s) explain as to why p-nitrophenol is more acidic than phenol?
(i) - I Effect of nitro group
(ii) Greater resonance effect of p-nitrophenoxy group.
(iii) Steric effect of bulky nitro group.

In the following reaction, product (A) is

Which of the following shows iso-structural species?

Teflon polymer is formed by the polymerisation of

The Langmuir adsorption isotherm is deduced using the assumption

The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

Match the columns

One gram of a monobasic acid when dissolved in 100 g of water lowers the freezing point by 0.186° C Now, 0.25 g of the same acid is dissolved and titrated with 15.1 mL of N/10 alkali. The degree of dissociation of the acid is (k_f for H₂O = 1.86)

The correct surgical procedure as a contraception method is

Which one of the following is a living fossil?

Identify the correct statement among following regarding the growth in plants

Bryophytes resemble algae in which of the following aspects?

Debove's membrane is a layer of

When gynoecium is present in the top most position of thalamus, the flower is known as

Niche overlap indicates

In land plants, the guard cells differ from other epidermal cells in having

Connective tissue is

In which of the following cell organelles would you expect to find the biochemical reactions that harness energy from the breakdown of sugar molecules to synthesize large amounts of ATP?

Photophosphorylation differs from oxidative phosphorylation in requiring input of energy in the form of

The diagram below is a model demonstrating the mass flow hypothesis of translocation.

What are the structures represented by W, X, Y and Z and what is the direction of flow of solution along W?

In DNA model of Watson and Crick, the major grooves represent one of the following sites

A plant cell placed in pure water will

Sickle-cell anaemia is example of

In which stage of the cell cycle histone proteins synthesised in a eukaryotic cell?

Monoecious plant of Chara shows occurrence of

Differentiation of shoot is controlled by

Two common characters found in centipede cockroach and crab are

Nuclear DNA exists as a complex of proteins called ______ that condenses into _______ during cellular division.

Both, autogamy and geitonogamy are prevented in

Which of the following pathways outlines the order of events during aerobic cellular respiration? first—>last

Heart to pump blood evolved for the first time in

In tissue culture, roots can be induced by

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

Which one of the following is a natural growth inhibitor?

The causative agent of mad-cow disease is a

Unisexuality of flowers prevents

The C0₂ compensation point for C₄-plants is

If the age distribution (percent individuals of a given age or group) is plotted for the population, the resulting structure is called a/an

Flowers are zygomorphic in

Select the option which shows correct matching of animal with there excretory organs and excretory product.

The enzyme of EMP are located in

The term ‘keel’ is used for special type of

Part of the plant, which is cultured to obtain virus; Free clones is

The genetically-modified (GM) brinjal in India has been developed for:

Many cells function properly and divide mitotically even though they do not have

Which one of the following expanded forms of the following acronyms is correct?

Crossing over is the exchange of parts of chromosomes between two non-sister chromatids. Crossing over in diploid organism is responsible for

When huge amount of sewage is dumped into a river, its B.O.D. will

Which one of the following is the most important for transfection in animal?

Match the column-I with column-II and choose the correct option.

Which one is the component of ornithine cycle?

Which of the following statement is correct about incomplete linkage?
(i) It is phenomenon in which more recombinants are produced in F₂ generation.
(ii) More parental combination are produced in F₁ generation.
(iii) Genotypes which are present in hybrid reappear in high frequency in F₂ generation.
​(iv) It is a phenomenon in which two chromosomes are linked.

Ovulation takes place in a month during

In prokaryotes, the genetic material is

The Father has blood group AB and mother O. The child is supposed to have, which of the following blood groups?

Animals with metameric segmentation, bilateral symmetry and closed circulatory system belong to phylum

Double stranded RNA is found in

Match the scientists given in column-I with their work given in column-II and select the correct option.

The bacteria Pseudomonas is useful because of its ability to

Code transfer for synthesis of polypeptide involves:

Surface architecture is studied b y the help of one of the following method

In cockroach, the corpora allata is a/an

Volkmann’s canals are

Both the crown and root of a tooth is covered by a layer of bony hard substance. It is called

Reproduction is the characteristic feature of livin g organisms. Which of the following cannot reproduce?

Even when there is no air in it, human trachea does not collapse due to presence of​

Metabolic reactions can be demonstrated outside of the body in cell free systems. An isolated metabolic reaction outside the body of an organism, performed in a test tube is

What would happen if oxygen availability to activated sludge floes is reduced?

Sequence of DNA (non-coding) is known as

Diagram represents one cardiac cycle lasting 0.8 s and to the possible answers that follow it.

Which answer describes the events that occur during period X ?

Urea synthesis occurs in

Consider the following four statements (i - iv) about certain desert animals such as kangaroo rat.
(i) They have dark colour and high rate of reproduction and excrete solid urine.
(ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
(iii) They feed on dry seeds and do not require drinking water.
​(iv) They excrete very concentrated urine and do not use water to regulate body temperature.

Which two of the above statements for such animals are true?

The potential energy of water is referred as

Thin filaments of skeletal muscle fibres contain

Which of the following is a 4 - Carbon compound?

Among which one of the following groups of chemicals, all are neurotransmitters?

Nissl granules are found in nerve cell and identified as one of the following structure

Match column-I with column-II and choose the correct option.

At retrogressive metamorphosis, the urochordate larva

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

Which among the following type of DNA is present in bacterium E. coli?

Which of the following statements is false?

Golden rice is a

Egg is liberated from ovary in

Stroma in the chloroplasts of higher plants contain

Progestasert and LNG-20 are

Insects have

Select the correct statement from the ones given below with respect to dihybrid cross.

Nerve impulse initiates with the movement of

Which of the following is the first thing that happens when a signal molecule acts on a target cell?

What is a keystone species?

Damage to thymus in a child may lead to

The hormone which regulates sleep-wake cycle in man is

An “Urn” shaped population age pyramid represents

In the process of photosynthesis, water molecule breaks during

Match column-I with column-II and select the correct answer using the codes given below.

A 22 years student goes to his ophthalmologist. He has problem in reading books because he is not be able to contract his

Which one of the following pairs of structures is correctly matched with their correct description ?