List of top Chemistry Questions

XeF$_4$ reacts with SbF$_5$ to form:
\[ [\text{XeF}_m]^{n+}[\text{SbF}_y]^{z-} \] What is $m+n+y+z$?

Incorrect statement about Borazine is:

How many statements are correct:

If there is no relation between rate constant and temperature, then activation energy is negative.
If the activation energy is zero, rate constant is temperature independent.
If rate constant increases with increase of temperature, activation energy is positive.
If rate constant decreases with increase in temperature, activation energy is negative.

Sulphur (S)-containing amino acids from the following are:
(a) Isoleucine
(b) Cysteine
(c) Lysine
(d) Methionine
(e) Glutamic acid

Which of the following elements is most reactive?

Read the following two statements
Statement I: Ionic radius of Li+ is greater than Mg++
Statement II: Lithium and magnesium can't form superoxide

CH₃CH₂-Br $\overrightarrow{Acetone}^{NaI}$ CH₃-CH₂-I+NaBr
Which of the following statement is correct ?

A binary compound has Y-atoms forming FCC unit cell and another type of X-atoms occupying $\frac{1}{3}$^rd of tetrahedral voids. Find out the molecular formula of the compound

Order of Covalent bond:
A. $KF > KI ; LiF > KF$
B. $KF < KI ; LiF > KF$
C. $SnCl _4> SnCl _2 ; CuCl > NaCl$
D. $LiF > KF ; CuCl <NaCl$
E. $KF < KI ; CuCl > NaCl$
Choose the correct answer from the options given below:

Which of the following have square pyramidal structure?

2[Au(CN)₂]^– + Zn $\to$ [Zn(CN)₄]^2– + 2Au$\downarrow$ is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction

The value of $log_{10}K$ for a reaction A ⇋ B is

(Given,

$\Delta H^{\circ}_{298K}$ = –54.67 kJ $mol^{-1}$

$\Delta H^{\circ}_{298K}$ = 10 kJ $mol^{-1}$

and R = 8.314 J $K^{-1}mol^{-1}$

2.303 × 8.314 × 298 = 5705)

Choose the correct option.

Photochemical smog found mainly in

Match the following with the correct name of reaction

If the radius of ground state hydrogen is 51 pm, find out the radius of 5th orbit of Li²⁺ ions. (closest integer)

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid $[ A ]$ and $[ B ]$ are respectively

In which of the following pairs of elements electron gain enthalpy difference is highest?

Product (P) and (Q) are respectively

How many moles of Ba₃(PO₄)₂ will be formed by the reaction of 5 moles of BaCl₂ and 3 moles of Na₃(PO₄).

Which of the following reaction is correct?

Match the terms in Column-I with their description in Column-II and choose the correct option:

Column I (Chemical reactions)		Column II (Enzymes used)
(i)	Glucose → CO₂+ Ethanol	a	Pepsin
(ii)	Sucrose→Glucose + Fructose	b	Diastase
(iii)	Starch →Maltose	c	Zymase
(iv)	Protein→Amino acids	d	Invertase

Polymer which is named as orlon is:

How many bromo products are formed when ethane is reacted with excess of Br₂ on heating?

Reaction of $BeO$ with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $BeF _2$ and $NH _4 F$ What is ' $A ^{\prime}$ ?

Reaction	Name of reaction
(I)	(P)	Gattermann Koch reaction
(II)	(Q)	Hell Volhard Zelinsky
(III)	(R)	Iodoform reaction