What is the IUPAC name of CH₃CCI=C(CH₃)2?

A. 2-chloro -3 methylbut -2yne

B. 2 -chloro -3 methylbut -2ene

C. 2 -chloro -3 methylbutene

D. 3- methyl -2-chlorobut -2-ene

E. chlorobut -2 yne

What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?

A. A yellow precipitate of Cr(OH)₃ is formed

B. An orange precipitate of Cr(OH)₃ is formed

C. The colour changes from orange to yellow

D. The colour changes from yellow to orange

E. There is no visible reaction.

Which element is the most electronegative?

A. calcium

B. fluorine

C. iodine

D. oxygen

E. sodium

What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?

The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]

A. 3.2 g

B. 3.25 g

C. 6.4 g

D. 6.5 g

E. 64.0 g

An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]

A. CH₃Br

B. C₂H₅Br

C. C₃H₅Br

D. C₃H₇Br

E. C₄H₉Br

Why does the treatment of cotton fabrics with dilute acids weaken the materials?

A. Cotton is hydrolysed completely to glucose

B. The fabrics are soluble in dilute acids

C. The molecular chains are partially broken

D. The molecular chain length f the fabric increases

E. The thread holding the fabric together Is completely destroyed.

Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?

A. 6

B. 6.8

C. 6.9

D. 7

E. 7.1

What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]

A. 6.89g

B. 6.93g

C. 6.98g

D. 7.04g

E. 7.12g

An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?

A. \( \text{0} \)

B. 2

C. 3

D. 4

E. 5

Which metal is a constituent of both bronze and solder?

A. copper

B. lead

C. silver

D. tin

E. zinc