MCQOPTIONS
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MCQOPTIONS
This section includes 1262 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
At constant temperature the pressure of an ideal gas is doubled its density becomes_______________? |
| A. | Half |
| B. | Double |
| C. | Same |
| D. | None |
| Answer» C. Same | |
| 802. |
The diffusion of gases at absolute zero will be________________? |
| A. | Unchanged |
| B. | Slightly decreased |
| C. | Slightly increased |
| D. | Zero |
| Answer» E. | |
| 803. |
Molecular orbitals are filled according to _________________? |
| A. | Auf bau principle |
| B. | Hunds rule |
| C. | Paulis Exclusion principle |
| D. | All these |
| Answer» E. | |
| 804. |
Ionic bond is produced after complete transfer of ________________ ? |
| A. | Nucleus |
| B. | Neutrons |
| C. | Electrons |
| D. | Protons |
| Answer» D. Protons | |
| 805. |
Which of the following will have highest value of electron affinity_________________? |
| A. | F |
| B. | Cl |
| C. | Br |
| D. | I |
| Answer» C. Br | |
| 806. |
Bond will beionic when E.N difference of bonded atom is ____________________? |
| A. | Equal to 1.7 |
| B. | Greater than 1.7 |
| C. | Less than 1.7 |
| D. | No specificity exists |
| Answer» C. Less than 1.7 | |
| 807. |
By combining n atmic orbitals no. of hybrid orbitals will be__________________? |
| A. | 2n |
| B. | n |
| C. | 3n |
| D. | impossible to predict |
| Answer» C. 3n | |
| 808. |
Which one of the following has polar covalent bond ? |
| A. | HF |
| B. | CH4 |
| C. | H2 |
| D. | N2 |
| Answer» B. CH4 | |
| 809. |
Which of the following have their outer most shell complete in atomic form ? |
| A. | Noble gases |
| B. | Alkali metals |
| C. | Coinage metals |
| D. | Gun metals |
| Answer» B. Alkali metals | |
| 810. |
Which one is not the partial pressure of oxygen in the lungs ? |
| A. | 0.1526 atm |
| B. | 116 mm of Hg |
| C. | 116 torr |
| D. | 1 atm |
| Answer» E. | |
| 811. |
Energy of atom in compound is___________________? |
| A. | Higher than individual |
| B. | Lesser than individual |
| C. | No change |
| D. | Impossible to predict |
| Answer» C. No change | |
| 812. |
An atom loses or gains electrons to__________________? |
| A. | Gain stability |
| B. | Form a bond |
| C. | Complete its outermost shell |
| D. | all are accurate justifications |
| Answer» E. | |
| 813. |
In a group ionic radius ? |
| A. | Increases |
| B. | Decreases |
| C. | No change |
| D. | Variable trend |
| Answer» B. Decreases | |
| 814. |
Molecular orbital which have higher energy than atomic orbitals is called___________________? |
| A. | Bonding molecular orbital |
| B. | Antibonding molecular orbital |
| C. | Hybrid orbital |
| D. | Super atomic orbital |
| Answer» C. Hybrid orbital | |
| 815. |
Negative log of mular concentration of H+ ions is called___________________? |
| A. | pH |
| B. | pOH |
| C. | pKa |
| D. | pKw |
| Answer» B. pOH | |
| 816. |
Bond order for N2 molecule is __________________? |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 817. |
Geometry of molecule will be pyramidal if the outer post shell of the central atom has___________________? |
| A. | 3 bond pair one lone pair |
| B. | 2 bond pair 2 lone pair |
| C. | 1 bond pair 3 lone pair |
| D. | 3 lone pair 1 bond pair |
| Answer» B. 2 bond pair 2 lone pair | |
| 818. |
Methanol can be obtained from_________________? |
| A. | water gas |
| B. | destructive distillation of wood |
| C. | methane |
| D. | all |
| Answer» E. | |
| 819. |
Unit of dipole moment is_________________? |
| A. | Debye |
| B. | Poise |
| C. | Pascal |
| D. | Newton |
| Answer» B. Poise | |
| 820. |
The relative attraction of the nucleus for the electrons in a chemical bond is called _________________? |
| A. | Ionization energy |
| B. | Electron affinity |
| C. | Electro negativity |
| D. | None of the above |
| Answer» D. None of the above | |
| 821. |
Which of the solid does not contain covalent bond________________? |
| A. | Copper |
| B. | Ice |
| C. | Diamond |
| D. | Graphite |
| Answer» B. Ice | |
| 822. |
Which of the following will not change the concentration of ammonia at the equilibrium ? |
| A. | Increase of pressure |
| B. | Increase of volume |
| C. | Addition of catalyst |
| D. | Decrease of temperature |
| Answer» D. Decrease of temperature | |
| 823. |
Sharing of 1 electron pair by one specie forms_________________? |
| A. | Single covalent bond |
| B. | Hydrogen bond |
| C. | Double covalent bond |
| D. | Coordinate covalent bond |
| Answer» E. | |
| 824. |
Ionization energy in a period generally ___________________? |
| A. | Increases |
| B. | Decreases |
| C. | No change |
| D. | Variable trend |
| Answer» B. Decreases | |
| 825. |
Product of charge and distance is called__________________? |
| A. | Pressure |
| B. | Bond length |
| C. | Work |
| D. | Dipole moment |
| Answer» E. | |
| 826. |
In a period electronegativity from left to right_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Variable trend |
| Answer» B. Decreases | |
| 827. |
Unpaired electron in a molecule gives ______________ character ? |
| A. | Ferromagnetic |
| B. | Paramagnetic |
| C. | Diamagnetism |
| D. | Both A & B |
| Answer» C. Diamagnetism | |
| 828. |
Orbitals of same energy produced after mixing of orbitals of different energy are called __________________? |
| A. | Degenerate orbitals |
| B. | Generate orbitals |
| C. | Hybrid orbitals |
| D. | Zeeman orbitals |
| Answer» B. Generate orbitals | |
| 829. |
Hydrogen effuses four times more rapidly than volume of an unknown gas molar mass of unknown gas should be_______________? |
| A. | 16 gmol-1 |
| B. | 32 gmol-1 |
| C. | 48 gmol-1 |
| D. | 64 gmol-1 |
| Answer» C. 48 gmol-1 | |
| 830. |
What is the simplest form of matter ? |
| A. | Gas |
| B. | Liquid |
| C. | Solid |
| D. | Semi solid |
| Answer» B. Liquid | |
| 831. |
on sp3 hybridization ________________? |
| A. | All p-orbitals are involved |
| B. | One s and 3 p-orbitals are involved |
| C. | one p-orbital is involved |
| D. | four p-orbitals are involved |
| Answer» C. one p-orbital is involved | |
| 832. |
Critical temperature for different gases is different and depends upon______________? |
| A. | Size of molecule |
| B. | Shape of molecule |
| C. | Intermolecular attractions |
| D. | All of the above |
| Answer» E. | |
| 833. |
One mole of an ideal gas at 546.5 K under 2 atm pressure has a volume of________________? |
| A. | 22.414 m³ |
| B. | 44.828 dm³ |
| C. | 22.414 dm³ |
| D. | 11.212 cm³ |
| Answer» D. 11.212 cm³ | |
| 834. |
The kinetic molecular theory of gases was put forward in 1738 by _____________________? |
| A. | Boltzman |
| B. | Maxell |
| C. | Clausius |
| D. | Bernoulli |
| Answer» E. | |
| 835. |
If a buffer solution of higher pH than seven is to be made we use___________________? |
| A. | Strong acid and strong base |
| B. | Weak acid and strong base |
| C. | Weak acid and strong base |
| D. | Weak acid and its salt with strong base |
| Answer» E. | |
| 836. |
The processes of effusion and diffusion are best understand by________________? |
| A. | Daltons law |
| B. | Avogadros law |
| C. | Grahams law |
| D. | Charles law |
| Answer» D. Charles law | |
| 837. |
The non-ideal behaviour results chiefly from________________? |
| A. | Intermolecular attraction and infinite volume |
| B. | Elastic collisions and finite volume |
| C. | Intermolecular attractions and finite volume |
| D. | Intermolecular attraction only |
| Answer» D. Intermolecular attraction only | |
| 838. |
Linds method is employed for__________________? |
| A. | Separation of gases |
| B. | Expansion of gases |
| C. | Compression of gases |
| D. | Liquefaction of gases |
| Answer» E. | |
| 839. |
For a gas where volume and pressures are 1dm3 and 2 atm respectively what should be its new volume when pressure is increased to 6 atm at constant temperature ? |
| A. | 1/2dm3 |
| B. | 1/3dm3 |
| C. | 1/4dm3 |
| D. | 2/3dm3 |
| Answer» C. 1/4dm3 | |
| 840. |
What is the abundant form of matter on earth ? |
| A. | Gas |
| B. | Liquid |
| C. | Solid |
| D. | Plasma |
| Answer» D. Plasma | |
| 841. |
The partial pressure exerted by the water vapours is called_______________? |
| A. | Surface tension |
| B. | Aqueous tension |
| C. | Vapour pressure |
| D. | Hydraulic pressure |
| Answer» C. Vapour pressure | |
| 842. |
Which one is the right value for R ? |
| A. | 0.0821 atm dm3k-1mol- |
| B. | 0.0821 atm m3k-1mol-1 |
| C. | 2 cal k-1 mol-1 |
| D. | 8.314 Nm2k-1mol-1 |
| Answer» B. 0.0821 atm m3k-1mol-1 | |
| 843. |
Catalyst used to speed up the reaction of ammonia synthesis is________________________? |
| A. | V2O5 |
| B. | V2O5 and Pt |
| C. | Fe |
| D. | Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2 |
| Answer» E. | |
| 844. |
Reaction which proceeds in both directions is called_______________? |
| A. | reversible |
| B. | irreversible |
| C. | spontaneous |
| D. | non-spontaneous |
| Answer» B. irreversible | |
| 845. |
Rate expression for ammonia synthesis is___________________? |
| A. | Kc=x2/(a-x)(b-x) |
| B. | Kc=x2/v(a-x) |
| C. | Kc=4×2/(a-2x)2(b-x) |
| D. | Kc=4x2v2/(a-x)(b-3x)3 |
| Answer» E. | |
| 846. |
AgCl dissolved with conc (2×10-2) Ksp will be__________________? |
| A. | 3.6 x 10-6 |
| B. | 3.6 x 10-5 |
| C. | 7.2 x 10-6 |
| D. | 4 x 10-4 |
| Answer» E. | |
| 847. |
Conjugated base of a weak acid is_________________? |
| A. | weak |
| B. | strong |
| C. | moderately weak |
| D. | unstable |
| Answer» C. moderately weak | |
| 848. |
Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | any one |
| Answer» D. any one | |
| 849. |
By the addition of base in waterpH will be_______________? |
| A. | more than 7 |
| B. | less than 7 |
| C. | equal to 7 |
| D. | no effect |
| Answer» B. less than 7 | |
| 850. |
Unit of Kc is_______________? |
| A. | moles2dm+6 |
| B. | moles-2dm+6 |
| C. | moles+2dm-6 |
| D. | Kc may or may not have units |
| Answer» E. | |