Question

6. Which of following is not a acidic salt?
1
la) Cuso.
(b) NHead
(c) Fecle
(d)
d)CH cooNa
इसमे से कौन अम्लीय लवण नही है।
(a)Cuso.
(b) NH.cl
(c) Feci
(dICHCOONa
7. Curd cannot be stored in (i) Brass vessel (ii) Copper vessell (ii) Steel (iv) Bronze
(all,
I1,
(b) nih.iN
(COL, ii. in
( (dli, iv
दही को नही रखा जा सकता (1) पीतल के बर्तन में () ताबा के बर्तन में () स्टील के बर्तन में
(iv) कासा के बर्तन में
1
(a)1,18
(b) ii, it, iv
(c) Inv
(d)I,IV
8. Calcium phosphate is present in tooth enamel its nature is
1
(a Basic
(b) Acid
(c) Neutral
(d) Amphoteric
कैल्सियम फास्फेट दात के इनामेल में उपस्थित होता है। इसकी प्रकृति है।
(क्षारीय
(b)अम्लीय
(c) उदासीन
(d) उभयधर्मी
9. The electronic configuration of three elements X, Y, and z are X-2, 8, -2, 8, 7 and Z-2, 8,2
which of the following of correct?
1
(a) X is a metal (b) Y is a metal (c) Z is a non-metal
(diyisanon-metal
and Z is Metal
तीन तत्वों ४, , एवं 2 के इलेक्ट्रॉनिक विन्यास है x-2,8,V-2, 8, 7 एवं 1-2, 8, 2
निम्नलिखित में कौन सही है ?
(a) - एक धातु है (b) Y एक धातु है (c) Z एक अधातु है
(d), Usb
अधातु हैऔर 7 एक धातु है
10. Which among the following alloys contain mercury as one of its constituents?
1
(a)Stainless steel
(b) Alnico
(c)Solder
(d)Zinc
निम्नलिखित में कौन एक मिश्रधातु है जिसका मूल धातु पारा है।
(वास्टेनलेस स्टील (b) एलनिको
(c)सोल्डर
(d)जिक​

Answer 1

Explanation:

1. NaH2PO2 is not an acidic salt. It is a basic salt. It is a salt of weak acid H3PO2 and strong base NaOH. Hence, the aqueous solution of NaH2PO2 is alkaline in nature.

2.Curd contains lactic acid. Generally, acids react with metals to form a different compound. Thus, the curd is not stored in metal containers of brass, copper, and bronze as curd can react with them and produce compounds which are toxic to human beings and unfit for human consumption.

3.Calcium phosphate is basic salt since it is a source of weak phosphoric acid and a slightly stronger base of calcium hydroxide. Calcium phosphate is a mineral comprising calcium ion (Ca2+) and phosphate ion which is inorganic in nature. It is present in the crown area of the tooth and also in bones.

4.Zinc amalgam.All amalgams contain mercury as one of their constituents.

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