NEET Chemistry Daily MCQs Practice Questions | 8 August, 2024

Vapour pressure of benzene at 30°C is 121.8 mmHg. When 15 g of a non volatile solute is dissolved in 250 g of benzene its vapour pressure decreased to 120.2 mmHg. The molecular weight of the solute. (Mo. wt. of solvent = 78):

The long form of periodic table consists of:

'Oxidation number of H in NaH, CaH₂ and LiH, respectively is:

The coordination number of a central metal atom in a complex is determined by:

Which one of the following does not correctly represent the correct order of the property indicated against is :

The enthalpy of formation of ammonia gas at 298 K is – 46.11 kJ mol^–1. The equation to which this value relates is:

The brown ring test for ${\text{NO}}_2^{-}$ and ${\text{NO}}_3^{-}$ is due to the formation of complex ion with formula:

The conversion $\text{PhCN}\to {\text{PhCOCH}}_3$, can be achieved most conveniently by reaction with:

Choose the correct option for the following reactions.

$\mathrm{B}\underset{{\mathrm{H}}_2{\mathrm{O}}_2/{\mathrm{OH}}^{⊝}}{\overset{{\left({\mathrm{BH}}_3\right)}_2}{\leftarrow }}{\mathrm{H}}_3\mathrm{C}—\underset{\stackrel{|}{{\mathrm{CH}}_3}}{\stackrel{\underset{|}{{\mathrm{CH}}_3}}{\mathrm{C}}}—\mathrm{CH}={\mathrm{CH}}_2\underset{{\mathrm{NaBH}}_4}{\overset{\mathrm{Hg}{\left(\mathrm{OAc}\right)}_2, {\mathrm{H}}_2\mathrm{O}}{\to }}\mathrm{A}$

Which of the following is the correct increasing order of lone pair of electrons on the central atom?

Consider the given reaction, percentage yield of :

For the given reactions
${\text{Sn}}^{2+}+2{\text{e}}^{-}\to \text{Sn}$
${\text{Sn}}^{4+}+4{\text{e}}^{-}\to \text{Sn}$

The electrode potentials are:
$E_{{\text{Sn}}^{2+}\mathrm{/}\text{Sn}}^{\circ }=-0.140\text{ V}$
$E_{{\text{Sn}}^{4+}\mathrm{/}\text{Sn}}^{\circ }=0.010\text{ V}$

The magnitude of standard electrode potential for ${\text{Sn}}^{4+}\mathrm{/}{\text{Sn}}^{2+}$ i.e. $E_{{\text{Sn}}^{4+}\mathrm{/}{\text{Sn}}^{2+}}$ is _____ $\times 10^{-2}\text{V}$.

It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be____ kJmol^–1
.
(Given ln 10 = 2.3, R = 8.3JK^–1 mol^–1, log 2 = 0.30)

 Given below are two statements: one is labelled as Assertion(A) and the other is labelled as Reason (R).
Assertion(A) : Bond dissociation energy is F₂ > Cl₂
Reason (R) : Cl₂ have more electronic repulsion than F₂

In the light of the above statements, choose the most appropriate answer from the options given below:

Match Column-I with Column-II.

KMnO₄ reacts with oxalic acid as:
${\text{MnO}}_4^{-}+{\text{C}}_2{\text{O}}_4^{2-}+{\text{H}}^{+}\to {\text{Mn}}^{2+}+{\text{CO}}_2+{\text{H}}_2\text{O}$

Hence, 50 ml of 0.04M KMnO₄ in acidic medium is chemically equivalent to:

Arrange the following elements in the increasing order of their metallic character: Li, Na, K, Be

 Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

 Which of the following statements regarding fuel cell is incorrect?

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?

(A) NO (B) N₂ (C) O₂ (D) C₂ (E) B₂

Choose the most appropriate answer from the options given below :