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Chemistry MCQs for NEET — Practice Questions with Answers

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Which catalyst is used in inversion of sucrose ?

A. $ Fe_{(s)} $ B. $ NO_{(g)} $ C. $ H_2 SO_4 $ D. $ Cl_{(g)} $

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Which catalyst is used to obtain methanal from water gas ?

A. Cu B. $ ZnO-Cr_2O_3 $ C. 1 & 2 D. FeO

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Which catalyst is used in the decomposition of ozone ?

A. $ Cl_{2(g)} $ B. $ Cl_{(g)} $ C. $ O_{2(g)} $ D. All the given

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Which catalyst is used to prepare propylene oxide from the reaction between propylene and dioxygen ?

A. Rh-Pd complex B. $ [Rh(CO)_2I_2] $ complex C. Mo(VI)complex D. Ni-Pd complex

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On which factor activity of catalyst depends ?

A. On the strength of chemical adsorption. B. On the concentration of products. C. On the concentration of reactants. D. On the physical state of catalyst

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$ CO_{(g)} + H_{2(g)} \rightarrow x $ what is X ?

A. Methane B. Methanal C. Formic acid D. Formaldehyde

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How many times reaction rate increase by catalyst ?

A. $ 10 ^ {10} to 10 ^ {20} $ B. $ 10 ^ {2 } to 10 ^ {4 } $ C. $ 10 ^ {6 } to 10 ^ {8} $ D. $ 10 ^ {8} to 10 ^ {20} $

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An isolated system-

is a specified region where transfers of energy and mass take place

is a region of constant mass and only energy is allowed to close the boundaries

is one in which mass within the system is not necessarily constant.

cannot transfer either energy of mass to or from the surroundings.

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Explanation

(D) An isolated system is one which is separated so that the mass and energy of the system cannot be transferred to or from the surroundings.

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The valence electron in alkali metal is a [1990]

f-electron

p-electron

s-electron

d-electron

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Explanation

The outermost electrons in an atom are called valence electrons. In alkali metals (IA group) outermost electron is present in s-orbital. Alkali metals have one valence electron. e.g. Li, Na, K.

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Who discovered spin quantum number

Unlenbeck and Goudsmit

Nell’s Bohr

Zeeman

Sommerfield

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Explanation

(a)

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