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Chemistry MCQs for NEET — Practice Questions with Answers

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Which physical state is accuired by water in between temperature above than 273 K and below 373 K?

A. plasma B. liquid C. solid D. Gas

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Which physical state of water is more compressable applying pressure at constant temperature ?

A. Ice B. water C. Vapour D. Plasma

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Which sabstance can be easily poored form one container into the other at room temperature ?

Kerosene

Ice

Salt

All

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The number of moles of KMnO4 that will be required to react with 2 mole of ferrous oxalate is

6 by 5

2 by 5

4 by 5

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What is meant by Bose Einstein condensate ?

A. It is the specific state of matter B. Showing relation $ E = MC^2$ for the matter C. It is an electronic device developed by Bose and Einstein D. It is an energy of radiation

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What is negative electrical charge on F atom in HF the permanent dipole molecule ?

A. $ higher than 1.6 \times 10 ^ {-19} C $ B. $ less than 1.6 \times 10^{-10} C $ C. $ less than 1.6 \times 10^{-19} C $ D. $ higher than 1.6 \times 10 ^ {-10} C $

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What is wrong about anode rays?

A. Their e/m ratio is constant B. They are deflected by electrical and magnetic field C. They are produced by ionisation of molecules of the residual gas D. Their elm ratio depends on nature of residual gas.

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When atoms of the gold sheet are bombarded by a beam of Ã¡ -particles, only a few Ã¡-particles get deflected whereas most of them go straight undeflected. This is because

A. The force of attraction on $ \alpha $ -particles by the oppositely charged electron is not sufficient B. The nucleus occupies much smaller volume as compared to the volume of atom C. The force of repulsion on fast moving $ \alpha $ -particles is very small D. The neutrons in the nucleus do not have any effect on $ \alpha $ -particles.

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Explanation

The reason why most alpha particles pass through the gold foil undeflected is that the nucleus occupies a very small volume compared to the entire atom's volume. As alpha particles are positively charged, they are repelled by the positively charged nucleus, but the tiny nuclear size makes direct hits unlikely.

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Which of the following is not a characteristic of Planckâ€™s quantum theory of radiations?

A. Radiations are associated with energy B. Magnitude of energy associated with a quantum is equal to hv C. Radiation energy is neither emitted nor absorbed continuously D. A body can emit less or more than a quantum of energy.

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Which of the following statements is wrong? The probability of finding the electron in $p_x$ orbital is

A. Maximum on two opposite sides of the nucleus along x-axis B. zero at the nucleus C. same on all the sides around the nucleus D. zero on the z-axis

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